# Boeing Alert Service Bulletin 777-53A0083: No revision named - Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2017-0630; AD 2018-02-20 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Boeing Alert Service Bulletin 777-53A0083](https://openairdocs.org/service-documents/boeing/777-53a0083.md) - Title as filed: SB-777-53A0083-00-- - Pages: 61 - PDF: https://openairdocs.org/files/sha256/74/ab/74ab3a7d1930987d6b369a59d9d601665386a93347f628c97c84d973f8fcb05d - Page: https://openairdocs.org/service-documents/boeing/777-53a0083/file/74ab3a7d1930 ## Text Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 Commercial Airplanes 777 Service Bulletin ALERT Number: 777-53A0083 Original Issue: April 20, 2017 ATA System: 5363 5373 SUBJECT: FUSELAGE - Section 46 and 47 Structure - Inspection for Corrosion or Crack Caused by Vacuum Waste System Contents Spill or Leak Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 300-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws. 9E991ECCN: BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2017 Boeing. Unpublished Work. All Rights Reserved. Treatment of this document and its content is governed by contract with Boeing. Rights to use this document are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The Boeing Company. Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and Boeing liveries are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing. Original Issue: April 20, 2017 777-53A0083 1 of 61 3.0 ### Page 2 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 2 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT BLANK PAGE ### Page 3 Table of Contents Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2. Data Supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 25 K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 M. Software Accomplishment Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 C. Parts Necessary for Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 27 3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 28 3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 FIGURE 1: INTERNAL AND EXTERNAL DETAILED INSPECTION . . . . . . . . . . . . . . . . . . . 38 FIGURE 2: CLEANING AND NEUTRALIZATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 FIGURE 3: RESTORATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 1: OPERATOR'S MAINTENANCE PROCEDURES AND AIRPLANE MAINTENANCE RECORD REVIEW FOR VACUUM WASTE SYSTEM CONTENTS SPILL AND LEAK . . . . . . . . . . . . . . . . 53 APPENDIX B: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 2: INTERNAL AND EXTERNAL DETAILED INSPECTIONS OF THE AFT FUSELAGE STRUCTURE FOR ANY CORROSION OR CRACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 APPENDIX C: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 3: INTERNAL AND EXTERNAL DETAILED INSPECTIONS OF THE AFT FUSELAGE STRUCTURE FOR ANY CORROSION OR CRACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 3 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 4 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 4 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT BLANK PAGE ### Page 5 Commercial Airplanes 777 Service Bulletin ALERT SummaryNumber: 777-53A0083Original Issue: April 20, 2017 ATA System: 5363 5373 SUBJECT: FUSELAGE - Section 46 and 47 Structure - Inspection for Corrosion or Crack Caused by Vacuum Waste System Contents Spill or Leak THIS DOCUMENT IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS DOCUMENT TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER. CONCURRENT REQUIREMENTS None BACKGROUND This service bulletin is issued to inspect the lower aft fuselage structure for any corrosion or crack and to raise awareness that, a vacuum waste system spill or leak is acidic and corrosive. This service bulletin also ensures operators are aware that Boeing maintenance procedure changes have occurred and verifies these changes have been updated to the operator's maintenance programs. Failure to clean and neutralize a vacuum waste system spill or leak will result in corrosion to the airplane structure such as the skin, stringers and frames. If not corrected, undetected corrosion of the fuselage skin, stringers and frames can cause fatigue cracks, which can result in possible rapid decompression and loss of structural integrity. Corrosion was found during pre-flight, post-flight walk around inspections as well as scheduled internal and external inspections on nine different airplanes. The corrosion was found in the lower left side of the aft fuselage from Station 1790 to Station 2033.5 from stringer S-34L to S-49R. The corrosion was caused by a failure to clean and neutralize vacuum waste system acidic and corrosive contents spill or leak which allows for the breakdown of protective finishes and accelerates the corrosion reaction rate. Seven of the nine airplanes had additional corrosion found after initial corrosion repair was accomplished in an adjacent area. Five of the seven airplanes reported second additional corrosion finding after the first additional finding in an adjacent area. The additional corrosion findings were detected as early as 300 days after the previous corrosion finding. Vacuum waste system residue, on the structure or in the insulation blankets, becomes reactivated with moisture developed during flight and causes this additional corrosion. Exfoliation corrosion of aluminum structure can result in a fatigue cracks. One airplane reported a 13 inch skin exfoliation flake from Station 1790 to Station 1811, from stringer S-41L to S-42L. The exfoliating or flaking effect of the intergranular corrosion originated on the inner surface of the skin and stringer. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 5 of 61 ### Page 6 Prior to the release of revised Aircraft Maintenance Manuals (AMM) and a new Structural Repair Manual (SRM) these manuals did not give explicit instructions that the acid neutralization was necessary for a vacuum waste system contents spill or leak. Vacuum waste system contents spill and leak neutralization procedures have been revised in the AMM and SRM. This service bulletin is to correct any vacuum waste system spill or leak that may not have been cleaned and neutralized before these changes. The revised procedures are to ensure vacuum waste system contents spills and leaks are clean and neutralized correctly in the future. Airplanes after Line Number (LN) 1446 are not included in the effectivity of this service bulletin. Sufficient time was allowed for full incorporation of these procedures into the operator's maintenance program for all airplanes after LN 1446. The following Boeing maintenance documents clarify the requirement. – Added Structural Repair Manual (SRM) 777-200 SRM 51-20-18 and 777-300 SRM 51-20-18, General - Correction Procedures For the Leakage of Vacuum Waste System, to define the necessary procedure to avoid damage or to correct damage after a spill or leak of vacuum waste system contents. These contents are acidic and corrosive and will cause damage to protective finishes and result in structural corrosion. – Revised 777 AMM 05-51-57, 777 AMM 51-00-57, and 777 AMM 51-05-01 procedures for after acid spills to include the contents of the vacuum waste system. – Issued MOM-MOM-16-0699-01B and Boeing Service Letter 777-SL-53-011 to request operators incorporate these maintenance document changes into the operator's maintenance procedures. Additionally structural maintenance, system maintenance, and operational requirements personnel should be trained and knowledgeable on how to apply the new or revised Boeing procedures when vacuum waste system spills or leaks occur. This service bulletin is related to 777 FTD 38-08004, 777 FTD 51-09001, and 777 FTD 53-15001. Boeing Service Related Problem (SRP) 777-SRP-53-0484 is related to this service bulletin. This table is provided to operators for planning purposes only. Refer to the applicable sections for more information. ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Paragraph 1.E., Compliance and Paragraph 1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesNoWeight and Balance Change Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedNoPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Air- plane Flight Manual) Paragraph 2.C.1., Kits/PartsNoKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator YesOperator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 6 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 7 ACTION This service bulletin is divided into work packages. REVIEW THE REQUIREMENTS FOR EACH WORK PACKAGE TO DETERMINE ALL THE NECESSARY ACTIONS. WORK PACKAGE 1 reviews the operator's maintenance procedures used to clean and neutralize vacuum waste system spills and leaks and reviews the airplane maintenance records to see if all vacuum waste system spills and leaks were cleaned and neutralized using the necessary procedure. Based on the results of the maintenance procedure and airplane record review do WORK PACKAGE 2 or WORK PACKAGE 3. WORK PACKAGE 2 does an internal and external detailed inspection for any corrosion or crack and resulting actions for airplanes that found CONDITION 1 or CONDITION 2.1 in WORK PACKAGE 1. WORK PACKAGE 3 does an internal and external detailed inspection for any corrosion or crack and resulting actions for airplanes that found CONDITION 2.2 in WORK PACKAGE 1. EFFECTIVITY 777-200/-200LR/-300/-300ER Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory. Refer to Paragraph 1.E., Compliance. INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection and repair given in this service bulletin. MANPOWER Total Elapsed Hours Total Task HoursAirplanes 26.25105.00777-200/-200LR/-300/-300ER Refer to Paragraph 1.G., Manpower for detailed information MATERIAL INFORMATION Operator Supplied Parts/Materials. Refer to Paragraph 2.A., Material - Price and Availability. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 7 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 8 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT -REVIEW MAINTENANCE PROCEDURES. -IF THE MAINTENANCE PROCEDURES ARE NOT ACCEPTABLE, UPDATE MAINTENANCE PROCEDURES TO THE BOEING APPROVED PROCEDURE. -DO INTERNAL AND EXTERNAL DETAILED INSPECTIONS FOR ANY CORROSION OR CRACK. - REPAIR ANY CORROSION OR CRACK FOUND -CLEAN AND NEUTRALIZE THE INSPECTION AREA. STA 2000 STA STA 2033.5 STA 1979 1958 1937 STA STA STA 2017 1916 1895 STA 1874 STA 1853 STA STA 1832 STA STA 1790 1811 STA 1769 S-34L S-35L ~S-38L ~S-40L -S-43L - S-49L ~S-46L 2520121 *S-49R Original Issue: April 20, 2017 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 777-53A0083 Work - See page 1 for details. 8 of 61 ### Page 9 Commercial Airplanes 777 Service Bulletin ALERT Number: 777-53A0083 Original Issue: April 20, 2017 ATA System: 5363 5373 SUBJECT: FUSELAGE - Section 46 and 47 Structure - Inspection for Corrosion or Crack Caused by Vacuum Waste System Contents Spill or Leak THIS DOCUMENT IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS DOCUMENT TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER. 1. PLANNING INFORMATION A. Effectivity 1. Airplanes This service bulletin is applicable to 777-200/-200LR/-300/-300ER Airplanes, line numbers 1-1446 in 1 Group. The Variable Numbers and Group Information for the applicable airplanes is given below. Refer to Service Bulletin Index D624W001 PART 4 for Airplane Variable Number, Line Number, and Serial Number data. DESCRIPTIONCONFIGURATIONGROUP 777-200/-200LR/-300/-300ER airplanes.-1 Airplane Models: 777-200, 777-200LR, 777-300, 777-300ER GroupVariable Number 1WA001 - WA017 1WA076 - WA080 1WA086 - WA093 1WA101 - WA104 1WA116 - WA119 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 9 of 61 ### Page 10 GroupVariable Number 1WA131 - WA137 1WA171 - WA175 1WA196 - WA198 1WA206 - WA212 1WA221 - WA223 1WA231 - WA232 1WA241 - WA250 1WA261 - WA266 1WA281 - WA283 1WA301 - WA304 1WB001 - WB021 1WB031 - WB046 1WB051 - WB088 1WB101 - WB106 1WB121 - WB125 1WB131 - WB148 1WB151 - WB155 1WB161 - WB177 1WB181 - WB194 1WB201 - WB215 1WB231 - WB247 1WB271 - WB273 1WB276 - WB286 1WB291 - WB302 1WB306 - WB307 1WB311 - WB337 1WB341 - WB342 1WB366 - WB368 1WB371 - WB388 1WB406 1WB411 - WB413 1WB416 - WB439 1WB446 - WB453 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 10 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 11 GroupVariable Number 1WB476 1WB481 - WB484 1WB501 - WB512 1WB531 - WB537 1WB551 - WB554 1WB591 - WB597 1WB601 - WB606 1WB611 - WB622 1WB631 - WB638 1WB646 - WB649 1WC051 - WC073 1WC101 - WC104 1WC111 - WC120 1WC221 - WC224 1WC241 - WC243 1WC281 - WC290 1WC301 - WC308 1WC361 - WC364 1WC371 - WC374 1WC381 - WC395 1WC441 1WC446 - WC449 1WC456 - WC459 1WC486 - WC493 1WC506 - WC508 1WC521 - WC522 1WC531 - WC536 1WC546 - WC548 1WC556 1WC566 - WC567 1WC571 - WC574 1WC581 1WC586 - WC587 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 11 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 12 GroupVariable Number 1WC591 - WC595 1WD001 - WD002 1WD011 - WD018 1WD031 - WD036 1WD046 - WD055 1WD066 - WD075 1WD081 - WD089 1WD091 1WD096 1WD101 - WD106 1WD111 - WD112 1WD116 - WD117 1WD121 - WD122 1WD501 - WD513 1WD521 - WD541 1WD546 - WD554 1WD561 - WD573 1WD581 - WD599 1WD606 - WD609 1WD621 - WD632 1WD651 - WD665 1WD671 - WD677 1WD691 - WD709 1WD741 - WD752 1WD761 - WD771 1WD786 - WD788 1WD796 - WD837 1WD846 - WD867 1WD871 - WD904 1WD911 - WD918 1WD921 - WD957 1WD966 - WD970 1WD981 - WD982 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 12 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 13 GroupVariable Number 1WD986 - WD987 1WD991 - WD996 1WE001 - WE007 1WE011 - WE012 1WE021 - WE026 1WE031 - WE040 1WE051 - WE057 1WE071 - WE078 1WE081 - WE084 1WE091 - WE095 1WE126 - WE172 1WE176 - WE178 1WE186 - WE219 1WE226 - WE231 1WE236 - WE253 1WE261 - WE267 1WE271 - WE278 1WE291 - WE298 1WE301 - WE320 1WE331 - WE345 1WE351 - WE356 1WE376 - WE377 1WE381 1WE386 - WE387 1WE391 - WE392 1WE396 - WE405 1WE416 - WE420 1WE426 - WE431 1WE436 - WE446 1WE451 - WE466 1WE471 - WE478 1WE486 - WE493 1WE495 - WE499 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 13 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 14 GroupVariable Number 1WE501 - WE504 1WE511 - WE516 1WE526 - WE528 1WE536 - WE548 1WE556 - WE569 1WE576 - WE581 1WE591 1WE601 - WE605 1WE626 - WE627 1WE631 1WE641 - WE642 1WE646 1WE651 - WE661 1WE701 - WE703 1WE711 - WE712 1WE731 - WE732 1WE736 2. Spares Affected None. B. Concurrent Requirements None C. Reason This service bulletin is issued to inspect the lower aft fuselage structure for any corrosion or crack and to raise awareness that, a vacuum waste system spill or leak is acidic and corrosive. This service bulletin also ensures operators are aware that Boeing maintenance procedure changes have occurred and verifies these changes have been updated to the operator's maintenance programs. Failure to clean and neutralize a vacuum waste system spill or leak will result in corrosion to the airplane structure such as the skin, stringers and frames. If not corrected, undetected corrosion of the fuselage skin, stringers and frames can cause fatigue cracks, which can result in possible rapid decompression and loss of structural integrity. Corrosion was found during pre-flight and post-flight walk around inspections as well as scheduled internal and external inspections on nine different airplanes. The corrosion was found in the lower left side of the aft fuselage from Station 1790 to Station 2033.5 from stringer S-34L to S-49R. The corrosion was caused by a failure to clean and neutralize vacuum waste system acidic and corrosive contents spill or leak which allows for the breakdown of protective finishes and accelerates the corrosion reaction Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 14 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 15 rate. Seven of the nine airplanes had additional corrosion found after initial corrosion repair was accomplished in an adjacent area. Five of the seven airplanes reported second additional corrosion finding after the first additional finding in an adjacent area. The additional corrosion findings were detected as early as 300 days after the previous corrosion finding. Vacuum waste system residue, on the structure or in the insulation blankets, becomes reactivated with moisture developed during flight and causes this additional corrosion. Exfoliation corrosion of aluminum structure can result in a fatigue cracks. One airplane reported a 13 inch skin exfoliation flake from Station 1790 to Station 1811, from stringer S-41L to S-42L. The exfoliating or flaking effect of the intergranular corrosion originated on the inner surface of the skin and stringer. Prior to the release of revised Aircraft Maintenance Manuals (AMM) and a new Structural Repair Manual (SRM) these manuals did not give explicit instructions that the acid neutralization was necessary for a vacuum waste system contents spill or leak. Vacuum waste system contents spill and leak neutralization procedures have been revised in the AMM and SRM. This service bulletin is to correct any vacuum waste system spill or leak that may not have been cleaned and neutralized before these changes. The revised procedures are to ensure vacuum waste system contents spills and leaks are clean and neutralized correctly in the future. Airplanes after Line Number (LN) 1446 are not included in the effectivity of this service bulletin. Sufficient time was allowed for full incorporation of these procedures into the operator's maintenance program for all airplanes after LN 1446. The following Boeing maintenance documents clarify the requirement. – Added Structural Repair Manual (SRM) 777-200 SRM 51-20-18 and 777-300 SRM 51-20-18, General - Correction Procedures For the Leakage of Vacuum Waste System, to define the necessary procedure to avoid damage or to correct damage after a spill or leak of vacuum waste system contents. These contents are acidic and corrosive and will cause damage to protective finishes and result in structural corrosion. – Revised 777 AMM 05-51-57, 777 AMM 51-00-57, and 777 AMM 51-05-01 procedures for after acid spills to include the contents of the vacuum waste system. – Issued MOM-MOM-16-0699-01B and Boeing Service Letter 777-SL-53-011 to request operators incorporate these maintenance document changes into the operator's maintenance procedures. Additionally structural maintenance, system maintenance, and operational requirements personnel should be trained and knowledgeable on how to apply the new or revised Boeing procedures when vacuum waste system spills or leaks occur. This service bulletin is related to 777 FTD 38-08004, 777 FTD 51-09001, and 777 FTD 53-15001. Boeing Service Related Problem (SRP) 777-SRP-53-0484 is related to this service bulletin. D. Description This service bulletin is divided into work packages. REVIEW THE REQUIREMENTS FOR EACH WORK PACKAGE TO DETERMINE ALL THE NECESSARY ACTIONS. WORK PACKAGE 1 reviews the operator's maintenance procedures used to clean and neutralize vacuum waste system spills and leaks and reviews the airplane maintenance records to see if all vacuum waste system spills and leaks were cleaned and neutralized using the necessary procedure. Based on the results of the maintenance procedure and airplane record review do WORK PACKAGE 2 or WORK PACKAGE 3. WORK PACKAGE 2 does an internal and external detailed inspection for any corrosion or crack and resulting actions for airplanes that found CONDITION 1 or CONDITION 2.1 in WORK PACKAGE 1. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 15 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 16 WORK PACKAGE 3 does an internal and external detailed inspection for any corrosion or crack and resulting actions for airplanes that found CONDITION 2.2 in WORK PACKAGE 1. The work in this service bulletin is done in the maintenance zone(s) given below. Affected Maintenance Zones ZoneModel 151, 153, 154, 161, 163, 164777-200, 777-200LR, 777-300, 777-300ER E. Compliance The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory. Logic diagrams showing compliance tasks and compliance times are included as an aid in APPENDIX A, APPENDIX B, and APPENDIX C. When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When more than one ACTION is given for a CONDITION number or an OPTION number, do all of the ACTION numbers for that CONDITION number or OPTION number. Do the required actions in accordance with Paragraph 3. Accomplishment Instructions. REVIEW THE REQUIREMENTS FOR EACH COMPLIANCE TABLE TO DETERMINE ALL THE NECESSARY ACTIONS AT THE GIVEN COMPLIANCE TIME FOR EACH WORK PACKAGE. 1. WORK PACKAGE 1: OPERATOR'S MAINTENANCE PROCEDURES AND AIRPLANE MAINTENANCE RECORD REVIEW Table 1: Operator's Maintenance Procedures and Airplane Maintenance Record Review for Vacuum Waste System Contents Spill and Leak Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 375 Days after the original issue date of this service bulletin. Do PART 1: OPERA- TOR'S MAINTENANCE PROCEDURE REVIEW to determine if vacuum waste system contents spill and leak mainte- nance procedures are acceptable. All Airplanes Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 16 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 17 Table 1: Operator's Maintenance Procedures and Airplane Maintenance Record Review for Vacuum Waste System Contents Spill and Leak Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 435 Days after the original issue date of this service bulletin. CONDITION 1 (ACTION 1): Update the maintenance procedures to include acceptable vacuum waste system contents spill and leak mainte- nance procedures as specified by the Boeing approved procedures. CONDITION 1: OPERATOR'S MAINTE- NANCE PROCEDURES ARE NOT ACCEPTABLE (a) -At the time in Paragraph 1.E., Compliance, Table 2. CONDITION 1 (ACTION 2): Do WORK PACKAGE 2: INTERNAL AND EXTER- NAL DETAILED INSPEC- TIONS for any corrosion or crack. -Within 375 Days after the original issue date of this ser- vice bul- letin. Within 2,250 Days after the date of is- suance of the original certificate of airworthi- ness or the original ex- port certifi- cate of air- worthiness. Do PART 2: AIRPLANE RECORDS REVIEW to determine if they show all vacuum waste system contents spills or leaks were cleaned and neutral- ized using the acceptable procedure. CONDITION 2: OPERATOR'S MAINTE- NANCE PROCEDURES ARE ACCEPTABLE -At the time in Paragraph 1.E., Compliance, Table 2. Do WORK PACKAGE 2: INTERNAL AND EXTER- NAL DETAILED INSPEC- TIONS for any corrosion or crack. CONDITION 2.1: AIRPLANE RECORDS DO NOT SHOW ALL VACUUM WASTE SYSTEM CON- TENTS SPILLS AND LEAKS WERE CLEANED AND NEUTRALIZED AS DEFINED IN PART 2 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 17 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 18 Table 1: Operator's Maintenance Procedures and Airplane Maintenance Record Review for Vacuum Waste System Contents Spill and Leak Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -At the time in Paragraph 1.E., Compliance, Table 3. Do WORK PACKAGE 3: INTERNAL AND EXTER- NAL DETAILED INSPEC- TIONS for any corrosion or crack. CONDITION 2.2: AIRPLANE RECORDS SHOW NO VACUUM WASTE SYSTEM CON- TENTS SPILL OR LEAK, OR ALL VACUUM WASTE SYSTEM CONTENTS SPILLS AND LEAKS WERE CLEANED AND NEUTRALIZED AS DE- FINED IN PART 2 (a) The following are Boeing approved procedures. – 777 AMM 51-00-57 dated May 27, 2016 or later Boeing approved revisions that are published on myboeingfleet. – 777 AMM 05-51-57 dated May 27, 2016 or later Boeing approved revisions that are published on myboeingfleet. – 777 AMM 51-05-01 dated May 27, 2016 or later Boeing approved revisions that are published on myboeingfleet. – 777-200 SRM 51-20-18 dated May 25, 2016 or later FAA approved revisions that are published on myboeingfleet or 777-300 SRM 51-20-18 dated May 25, 2016 or later FAA approved revisions that are published on myboeingfleet. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 18 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 19 2. WORK PACKAGE 2: INTERNAL AND EXTERNAL DETAILED INSPECTIONS Table 2: Internal and External Detailed Inspections of the Aft Fuselage Structure for Any Cor- rosion or Crack Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 1,100 Days after the original is- sue date of this service bulletin. Within 2,250 Days after the date of is- suance of the original certificate of airworthi- ness or the original ex- port certifi- cate of air- worthiness. Do PART 4: INTERNAL AND EXTERNAL DE- TAILED INSPECTIONS for any corrosion or crack. All Airplanes that have ac- cumulated less than 4,015 days after the date of is- suance of the original cer- tificate of airworthiness or the original export certifi- cate of airworthiness, on the original issue date of this service bulletin. -Within 550 Days after the original issue date of this service bulletin. Do PART 4: INTERNAL AND EXTERNAL DE- TAILED INSPECTIONS for any corrosion or crack. All Airplanes that have ac- cumulated 4,015 days or more, but less than 5,840 days after the date of is- suance of the original cer- tificate of airworthiness or the original export certifi- cate of airworthiness, on the original issue date of this service bulletin. -Within 375 Days after the original issue date of this service bulletin. Do PART 4: INTERNAL AND EXTERNAL DE- TAILED INSPECTIONS for any corrosion or crack. All Airplanes that have ac- cumulated 5,840 days or more after the date of is- suance of the original cer- tificate of airworthiness or the original export certifi- cate of airworthiness, on the original issue date of this service bulletin. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 19 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 20 Table 2: Internal and External Detailed Inspections of the Aft Fuselage Structure for Any Cor- rosion or Crack Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.OPTION 1 (ACTION1):CONDITION 3: Do PART 5: CLEANING AND NEUTRALIZATION to the entire internal in- spection area. NO CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONS -Before further flight.OPTION 1 (ACTION 2): Do PART 7: RESTORA- TION for protective finish- es and insulation blan- kets. (a) -Before further flight.OPTION 2 (ACTION 1): Do PART 7: RESTORA- TION for protective finish- es and insulation blan- kets. 375 Days (a) -OPTION 2 (ACTION 2): Repeat PART 4: INTER- NAL AND EXTERNAL DETAILED INSPEC- TIONS for any corrosion or crack. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 20 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 21 Table 2: Internal and External Detailed Inspections of the Aft Fuselage Structure for Any Cor- rosion or Crack Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.OPTION 3 (ACTION 1):CONDITION 4: Do PART 5: CLEANING AND NEUTRALIZATION to the entire internal in- spection area. ANY CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONS -Before further flight.OPTION 3 (ACTION 2): Do PART 6: REPAIR for any corrosion or crack. -Before further flight.OPTION 3 (ACTION 3): Do PART 7: RESTORA- TION for protective finish- es and insulation blan- kets. (a) -Before further flight.OPTION 4 (ACTION 1) : Do PART 5: CLEANING AND NEUTRALIZATION to the contaminated area only. -Before further flight.OPTION 4 (ACTION 2): Do PART 6: REPAIR for any corrosion or crack. -Before further flight.OPTION 4 (ACTION 3): Do PART 7: RESTORA- TION for protective finish- es and insulation blan- kets. 375 Days (a) -OPTION 4 (ACTION 4): Repeat PART 4: INTER- NAL AND EXTERNAL DETAILED INSPEC- TIONS for any corrosion and crack. (a) Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 21 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 22 3. WORK PACKAGE 3: INTERNAL AND EXTERNAL DETAILED INSPECTIONS Table 3: Internal and External Detailed Inspections of the Aft Fuselage Structure for Any Cor- rosion or Crack Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 1,100 Days after the original is- sue date of this service bulletin. Within 2,250 Days after the date of is- suance of the original certificate of airworthi- ness or the original ex- port certifi- cate of air- worthiness. Do PART 4: INTERNAL AND EXTERNAL DE- TAILED INSPECTIONS for any corrosion or crack. All Airplanes that have ac- cumulated less than 4,015 days after the date of is- suance of the original cer- tificate of airworthiness or the original export certifi- cate of airworthiness, on the original issue date of this service bulletin. -Within 550 Days after the original issue date of this service bulletin. Do PART 4: INTERNAL AND EXTERNAL DE- TAILED INSPECTIONS for any corrosion or crack. All Airplanes that have ac- cumulated 4,015 days or more, but less than 5,840 days after the date of is- suance of the original cer- tificate of airworthiness or the original export certifi- cate of airworthiness, on the original issue date of this service bulletin. -Within 375 Days after the original issue date of this service bulletin. Do PART 4: INTERNAL AND EXTERNAL DE- TAILED INSPECTIONS for any corrosion or crack. All Airplanes that have ac- cumulated 5,840 days or more after the date of is- suance of the original cer- tificate of airworthiness or the original export certifi- cate of airworthiness, on the original issue date of this service bulletin. -Before further flight.Do PART 7: RESTORA- TION for protective finish- es and insulation blan- kets. CONDITION 5: NO CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONS (a) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 22 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 23 Table 3: Internal and External Detailed Inspections of the Aft Fuselage Structure for Any Cor- rosion or Crack Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.OPTION 5 (ACTION 1):CONDITION 6: Do PART 5: CLEANING AND NEUTRALIZATION to the entire internal in- spection area. ANY CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONS -Before further flight.OPTION 5 (ACTION 2): Do PART 6: REPAIR for any corrosion or crack. -Before further flight.OPTION 5 (ACTION 3): Do PART 7: RESTORA- TION for protective finish- es and insulation blan- kets. (b) -Before further flight.OPTION 6 (ACTION 1) : Do PART 5: CLEANING AND NEUTRALIZATION to the contaminated area only. -Before further flight.OPTION 6 (ACTION 2): Do PART 6: REPAIR for any corrosion or crack. -Before further flight.OPTION 6 (ACTION 3): Do PART 7: RESTORA- TION for protective finish- es and insulation blan- kets. 375 Days (b) -OPTION 6 (ACTION 4): Repeat PART 4: INTER- NAL AND EXTERNAL DETAILED INSPEC- TIONS for any corrosion and crack. (a) No further action is required after completion of PART 7. (b) Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 23 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 24 F. Approval This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this service bulletin comply with the applicable regulations and are FAA approved, as well as European Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in the service bulletin effectivity. This service bulletin and its approval were based on the airplane in its original Boeing delivery configuration or as modified by other approved Boeing changes. If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before incorporating this service bulletin. G. Manpower Table 1: INTERNAL AND EXTERNAL DETAILED INSPECTIONS Elapsed HoursTask HoursNumber of Per- sons Task ---PART 1: OPERA- TOR'S MAINTE- NANCE PROCE- DURE REVIEW and PART 2: AIRPLANE MAINTENANCE RECORD REVIEW (a) 6.0024.004PART 3: OPEN AC- CESS 6.7527.004PART 4: INTERNAL AND EXTERNAL DETAILED INSPEC- TIONS 7.5030.004PART 5: CLEAN- ING AND NEU- TRALIZATION ---PART 6: REPAIR (b) ---PART 7: RESTORATION (c) 6.0024.004PART 8: CLOSE ACCESS 26.25105.00TOTAL FOR EACH AIRPLANE (d) (a) Time is dependent on type and size of database to be reviewed. (b) Time is dependent on the size and complexity of the repair. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 24 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 25 Table 1: INTERNAL AND EXTERNAL DETAILED INSPECTIONS Elapsed HoursTask HoursNumber of Per- sons Task (c) Time is dependent on the area that requires the finish restored. (d) Total time is dependent on inspection results. H. Weight and Balance Changes None I. Electrical Load Data Not changed. J. References 1. Existing Data: a. MOM-MOM-16-0699-01B b. Boeing Service Letter 777-SL-51-013, 777-SL-53-011 c. Boeing Service Related Problem (SRP) 777-SRP-53-0484 d. Service Bulletin Index D624W001 e. 777 Aircraft Maintenance Manual (AMM) 05-51-57, 25-52-00, 25-52-06, 25-52-10, 25-52-11, 25-52-20, 25-53-03, 25-80-00, 51-00-57, 51-05-01, 51-21-04, 51-24-09, 51-24-10 f. 777 Fleet Team Digest (FTD) 38-08004, 51-09001, 53-15001 g. 777-200 Structural Repair Manual (SRM) 51-20-18, 53-00-01, 53-00-03, 53-00-07 h. 777-300 Structural Repair Manual (SRM) 51-20-18, 53-00-01, 53-00-03, 53-00-07 2. Data Supplied with this Service Bulletin: None. 3. Installation Drawings Used in the Preparation of this Service Bulletin: TitleDrawing Number KEEL PANEL ASSY- END ITEM, LCD, SECTION 46146W2002 KEEL PANEL-END ITEM ASSY, SECTION 47147W2002 DRAIN TUBE INSTL- WASTE TANK WASTE SYSTEM472W1200 TUBING INSTL - SECT 46, WASTE SYSTEM472W2600 TUBING INSTL - SECT 47, WASTE SYSTEM472W2700 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 25 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 26 These drawings were used to prepare this service bulletin. These drawings are not necessary to make the specified changes, and are not supplied with this service bulletin. These drawings may not be applicable to all airplane configurations or operators. K. Publications Affected 1. Publications: None. 2. Damage Tolerance Based Structural Inspections: Boeing has evaluated the repairs and/or changes in this service bulletin for effects on Fatigue Critical Structure (FCS) and for changes to Damage Tolerance Inspections (DTI) required in the Maintenance Program. This service bulletin affects FCS but no new DTIs are necessary. L. Interchangeability and Intermixability of Parts Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts. M. Software Accomplishment Summary Not affected. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 26 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 27 2. MATERIAL INFORMATION A. Material - Price and Availability None. B. Industry Support Information Boeing warranty remedies are not available for the inspection and repair given in this service bulletin. C. Parts Necessary for Each Airplane 1. Kits/Parts None. 2. Parts and Materials Supplied by the Operator The following parts or materials are necessary to do the change in this service bulletin. Parts and materials in the manuals given in Paragraph 1.J., References, can also be necessary. Examine operator part and material supply to make sure all necessary parts and materials are available. NotesNameQTYPart Number / Specification COMPOUND -160 ozASTM D928 SODIUM BICARBONATE (a)CORROSION INHIBITING COMPOUND0.5 gallonBMS3-29 (a) (b)PRIMERAsBMS10-11, RequiredTYPE I (b) (c)CONVERSION COAT, TYPE II, CLASS A OR CLASS D As Required BAC5719 (a) Refer to the Qualified Products List at the end of the Boeing Material Specification (BMS) for supplier data. (b) Quantity required is depended on the amount of rework. (c) Refer to SOPM 20-43-03 for material sources. 3. Parts Modified and Reidentified None. 4. Parts Removed and Not Replaced None. D. Parts Necessary to Change Spares None. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 27 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 28 E. Special Tooling - Price and Availability None. F. Special Tooling Necessary to do this Service Bulletin No special tools or equipment are necessary to do the change in this service bulletin. But, maintenance and overhaul tools in the manuals given in Paragraph 1.J., References, can be necessary. Examine operator tool supply to make sure all necessary tools are available. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 28 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 29 3. ACCOMPLISHMENT INSTRUCTIONS A. GENERAL INFORMATION CAUTION: KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL, METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR OTHER ELECTRICAL DAMAGE. NOTE: 1. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for definition of the acronyms. 2. Obey all of the warnings and cautions given in the specified manual sections. 3. The work instructions are divided into work packages. Task Hours and Elapsed Hours for each package are given in Paragraph 1.G., Manpower. REVIEW THE REQUIREMENTS FOR EACH WORK PACKAGE TO DETERMINE ALL THE NECESSARY ACTIONS – WORK PACKAGE 1 reviews the operator's maintenance procedures used to clean and neutralize vacuum waste system contents spills and leaks and reviews the airplane maintenance records to see if all vacuum waste system spills and leaks were cleaned and neutralized using the necessary procedure. Based on the results of the maintenance procedure and airplane record review do WORK PACKAGE 2 or WORK PACKAGE 3. – WORK PACKAGE 2 does an internal and external detailed inspection for any corrosion or crack and resulting actions for airplanes that found CONDITION 1 or CONDITION 2.1 in WORK PACKAGE 1. – WORK PACKAGE 3 does an internal and external detailed inspection for any corrosion or crack and resulting actions for airplanes that found CONDITION 2.2 in WORK PACKAGE 1. 4. Unless shown differently, these dimensions and tolerances are used: – Linear dimensions are in inches – Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus or minus 0.03 inch – Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch – Angular tolerance is plus or minus 2 degrees – Hole dimensions for standard solid rivets and fasteners are in Structural Repair Manual (SRM) Chapter 51 – Torque Values: — Values for structural fasteners are given in 777 Structural Repair Manual, Chapter 51. — Values for airframe maintenance tasks are included in Chapter 20 of 777 Aircraft Maintenance Manual (AMM). 5. Use the approved fastener, process and material substitutions in accordance with SRM Chapter 51. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 29 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 30 6. A Detailed Inspection is defined as: An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors, magnifying lenses, etc. may be necessary. Surface cleaning and elaborate procedures may be required. 7. A General Visual Inspection is defined as: A visual examination of an interior or exterior area, installation or assembly to detect obvious damage, failure or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may require removal or opening of access panels or doors. Stands, ladders or platforms may be required to gain proximity to the area being checked. 8. Odor is an acceptable means to determine an irregularity for the insulation blanket inspection. 9. These work instructions refer to procedures included in other Boeing documents. When the words "refer to" are used and the operator has an accepted alternative procedure, the accepted alternative procedure can be used. When the words "in accordance with" are included in the instruction, the procedure in the Boeing document must be used. 10. Boeing Service Letter 777-SL-51-013, Damage Reporting and Repair Plan/Design Guidelines, is an acceptable procedure to request information from Boeing for additional structural repair instructions. The Service Letter describes what information must be provided to Boeing before a structural repair can be provided. 11. Refer to APPENDIX A, APPENDIX B, and APPENDIX C for logic diagrams. Logic diagrams are provided as an aid only. Information contained in Paragraph 1.E., Compliance is the primary source for compliance times. Information in Paragraph 3.B., Work Instructions is the primary source for tasks required for compliance. 12. If it is necessary to remove more parts for access, you can remove those parts. If you can get access without removing identified parts, it is not necessary to remove all of the identified parts. Jacking and shoring limitations must be observed. 13. Where the work instructions include installation of a kept part, a new or serviceable part with the same part number can be installed as an alternative to the kept part. 14. Use of colors in Figures is based on guidance from the ATA e-Business Program (ATA) iSpec 2200. 15. When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When more than one ACTION is given for a CONDITION number or an OPTION number, do all of the ACTION numbers for that CONDITION number or OPTION number. 16. The compliance times for the actions in Paragraph 3.B., WORK INSTRUCTIONS are in Paragraph 1.E., Compliance. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 30 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 31 17. Some steps in the Work Instructions are labeled as Required for Compliance (RC). If this service bulletin is mandated by an Airworthiness Directive (AD), then the steps labeled as RC, including sub-steps under an RC step and any figures identified in an RC step, must be done to comply with the AD. If a step or sub-step is labeled "RC Exempt," then the RC requirement is removed from that step or sub-step. An Alternative Method of Compliance (AMOC) is required for any deviations to RC steps, including sub-steps and identified figures. Steps not labeled as RC may be deviated from using accepted methods in accordance with the operator's maintenance or inspection program without obtaining approval of an AMOC. This is provided that the RC steps, including sub-steps and identified figures, can still be done as specified, and the airplane can be put back in an airworthy condition. 18. Contents of the vacuum waste system that can spill or leak are defined as: Human waste, paper products, galley waste (when galley disposal(s) are present), precharge chemicals, cleaning chemicals (including acidic decalcification products), disinfecting chemicals and water. 19. Neutralization is defined as: The steps to make the spill or leak contents not acidic or corrosive substance. Neutralizing odor does not meet the definition. 20. An acceptable vacuum waste system contents spill or leak maintenance procedure is defined as: A procedure that is used by all maintenance personnel to inspect any vacuum waste system contents spill or leak to determine if it has made contact with the airplane structure. And if the vacuum waste system contents have made contact with the structure, the procedure provides instructions to neutralize acidic contents. Detailed requirements are in PART 1: OPERATOR'S MAINTENANCE PROCEDURE REVIEW. 21. Contaminated area is defined as: The internal surface area of the fuselage structure where vacuum waste system contents residue can be seen visually along the drain path of the structure. 22. Conditional Inspection is defined as: A maintenance procedure that is accomplished after any vacuum waste system contents spill or leak has occurred. B. WORK INSTRUCTIONS 1. WORK PACKAGE 1: OPERATOR'S MAINTENANCE PROCEDURE AND AIRPLANE MAINTENANCE RECORD REVIEW a. RC - Do PART 1: OPERATOR'S MAINTENANCE PROCEDURE REVIEW to determine if vacuum waste system contents spill and leak maintenance procedures are acceptable. (1) CONDITION 1: OPERATOR'S MAINTENANCE PROCEDURES ARE NOT ACCEPTABLE. (a) CONDITION 1 (ACTION 1): Update the maintenance procedures to include acceptable vacuum waste system contents spill and leak maintenance procedures as specified by the Boeing approved procedures. NOTE: The following are Boeing approved procedures. – 777 AMM 51-00-57 dated May 27, 2016 or later Boeing approved revisions that are published on myboeingfleet. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 31 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 32 – 777 AMM 05-51-57 dated May 27, 2016 or later Boeing approved revisions that are published on myboeingfleet. – 777 AMM 51-05-01 dated May 27, 2016 or later Boeing approved revisions that are published on myboeingfleet. – 777-200 SRM 51-20-18 dated May 25, 2016 or later FAA approved revisions that are published on myboeingfleet or 777-300 SRM 51-20-18 dated May 25, 2016 or later FAA approved revisions that are published on myboeingfleet. (b) CONDITION 1 (ACTION 2): Do WORK PACKAGE 2: INTERNAL AND EXTERNAL DETAILED INSPECTIONS for any corrosion or crack at the compliance time specified in Paragraph 1.E., Compliance, Table 2. (2) CONDITION 2: OPERATOR'S MAINTENANCE PROCEDURES ARE ACCEPTABLE. (a) Do PART 2: AIRPLANE RECORDS REVIEW to determine if they show all vacuum waste system contents spills or leaks were cleaned and neutralized using the acceptable procedure. 1) CONDITION 2.1: AIRPLANE RECORDS DO NOT SHOW ALL VACUUM WASTE SYSTEM CONTENTS SPILLS AND LEAKS WERE CLEANED AND NEUTRALIZED AS DEFINED IN PART 2. a) Do WORK PACKAGE 2: INTERNAL AND EXTERNAL DETAILED INSPECTIONS for any corrosion or crack at the compliance time specified in Paragraph 1.E., Compliance, Table 2. 2) CONDITION 2.2: AIRPLANE RECORDS SHOW NO VACUUM WASTE SYSTEM CONTENTS SPILL OR LEAK, OR ALL VACUUM WASTE SYSTEM CONTENTS SPILLS AND LEAKS WERE CLEANED AND NEUTRALIZED AS DEFINED IN PART 2. a) Do WORK PACKAGE 3: INTERNAL AND EXTERNAL DETAILED INSPECTIONS for any corrosion or crack at the compliance time specified in Paragraph 1.E., Compliance, Table 3. 2. RC - WORK PACKAGE 2: INTERNAL AND EXTERNAL DETAILED INSPECTIONS. a. RC Exempt - Do PART 3: OPEN ACCESS. b. Do PART 4: INTERNAL AND EXTERNAL DETAILED INSPECTIONS for any corrosion or crack at the compliance time specified in Paragraph 1.E., Compliance, Table 2. (1) CONDITION 3: NO CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONS. (a) OPTION 1 (ACTION 1): Do PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area. (b) OPTION 1 (ACTION 2): Do PART 7: RESTORATION for protective finishes and insulation blankets. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 32 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 33 NOTE: Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. (c) OPTION 2 (ACTION 1): Do PART 7: RESTORATION for protective finishes and insulation blankets. (d) OPTION 2 (ACTION 2): Repeat PART 4: INTERNAL AND EXTERNAL DETAILED INSPECTIONS for any corrosion or crack at the repeat interval in Paragraph 1.E., Compliance, Table 2. NOTE: Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. (2) CONDITION 4: ANY CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONS. (a) OPTION 3 (ACTION 1): Do PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area. (b) OPTION 3 (ACTION 2): Do PART 6: REPAIR for any corrosion or crack. (c) OPTION 3 (ACTION 3): Do PART 7: RESTORATION for protective finishes and insulation blankets. NOTE: Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. (d) OPTION 4 (ACTION 1): Do PART 5: CLEANING AND NEUTRALIZATION to the contaminated area only. (e) OPTION 4 (ACTION 2): Do PART 6: REPAIR for any corrosion or crack. (f) OPTION 4 (ACTION 3): Do PART 7: RESTORATION for protective finishes and insulation blankets. (g) OPTION 4 (ACTION 4): Repeat PART 4: INTERNAL AND EXTERNAL DETAILED INSPECTIONS for any corrosion or crack at the repeat interval in Paragraph 1.E., Compliance, Table 2. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 33 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 34 NOTE: Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. c. RC Exempt - Do PART 8: CLOSE ACCESS. d. RC Exempt - Put the airplane back to a serviceable condition. 3. RC - WORK PACKAGE 3: INTERNAL AND EXTERNAL DETAILED INSPECTIONS. a. RC Exempt - Do PART 3: OPEN ACCESS. b. Do PART 4: INTERNAL AND EXTERNAL DETAILED INSPECTIONS for any corrosion or crack at the compliance time specified in Paragraph 1.E., Compliance, Table 3. (1) CONDITION 5: NO CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONS. (a) Do PART 7: RESTORATION for protective finishes and insulation blankets. NOTE: No further action is required after completion of PART 7. (2) CONDITION 6: ANY CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONS. (a) OPTION 5 (ACTION 1): Do PART 5: CLEANING AND NEUTRALIZATION of the entire internal inspection area. (b) OPTION 5 (ACTION 2): Do PART 6: REPAIR for any corrosion or crack. (c) OPTION 5 (ACTION 3): Do PART 7: RESTORATION for protective finishes and insulation blankets. NOTE: Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. (d) OPTION 6 (ACTION 1): Do PART 5: CLEANING AND NEUTRALIZATION to the contaminated area only. (e) OPTION 6 (ACTION 2): Do PART 6: REPAIR for any corrosion or crack. (f) OPTION 6 (ACTION 3): Do PART 7: RESTORATION for protective finishes and insulation blankets. (g) OPTION 6 (ACTION 4): Repeat PART 4: INTERNAL AND EXTERNAL DETAILED INSPECTIONS for any corrosion or crack at the repeat interval in Paragraph 1.E., Compliance, Table 3. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 34 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 35 NOTE: Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. c. RC Exempt - Do PART 8: CLOSE ACCESS. d. RC Exempt - Put the airplane back to a serviceable condition. PART 1: OPERATOR'S MAINTENANCE PROCEDURE REVIEW 1. Review the operator's maintenance procedures that give instructions on how to treat vacuum waste system contents spill or leak to determine if they are acceptable. Make sure that the operator's maintenance procedures are acceptable as follows: a. The procedures must be in use by ground maintenance, structural maintenance and system maintenance personnel, including all contract maintenance, since the date of issuance of the original certificate of airworthiness or the original export certificate of airworthiness. b. The procedure must have a conditional inspection for vacuum waste system contents spill or leak. (1) The conditional inspection must look at all vacuum waste system contents spills or leaks to determine if the spill or leak has made contact with the airplane structure. Look below lavatory tubing runs or drain tube runs, and adjacent to waste holding tanks. Trace the flow path of the spill or leak along the structure drain paths. c. The procedure must treat all vacuum waste system contents spill or leak in contact with the airplane structure as an acid and provide instructions to neutralize acidic contents. (1) The procedure must neutralize acid using the following steps: – Application of a neutralizing solution of sodium bicarbonate and water to all affected airplane structure with attention given to faying surface joints. Pressure application may be required to flush the joints thoroughly. – Continuous application of the solution until bubbles stop and allowing a minimum of five additional minutes. – Removal of the neutralized mixture. – Flushing the area with clean water while rubbing the surface intermittently with a brush until all undissolved sodium bicarbonate has been removed from the structure. PART 2: AIRPLANE MAINTENANCE RECORD REVIEW 1. Review the airplane maintenance records to determine if they show that all vacuum waste system contents spills or leaks in contact with airplane structure were cleaned and neutralized. Airplane maintenance records must show the following: a. All vacuum waste system contents spills or leaks are always recorded. b. All recorded vacuum waste system contents spills or leaks discrepancy and corrective actions show the following: Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 35 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 36 (1) Acceptable airplane records must include all maintenance actions since the date of issuance of original certificate of airworthiness or the original export certificate of airworthiness. (2) Acceptable airplane records must show the use of the acceptable vacuum waste system contents spill or leak maintenance procedures that clean and neutralize acid for all vacuum waste system contents spills or leaks. PART 3: OPEN ACCESS 1. Get access to the internal inspection area. – From Station 1874 to Station 2033.5 from S-38L to S-46L. – From Station 1853 to Station 1874 from S-35L to S-46L. – From Station 1790 to Station 1853 from S-35L to S-43L. – From Station 1853 to Station 1958 from S-46L to S-49R. a. Remove and keep bulk cargo compartment and aft cargo compartment liners to get access to the internal inspection area. Refer to 777 AMM 25-52-06 as an accepted procedure. b. Remove and keep waste tank enclosure panels to get access to the internal inspection area. Refer to 777 AMM 25-52-20 as an accepted procedure. c. Remove and keep the bulk cargo floor panels to get access to the internal inspection area. Refer to 777 AMM 25-52-11 as an accepted procedure. d. Remove and keep the aft cargo floor panels to get access to the internal inspection area. Refer to 777 AMM 25-52-10 as an accepted procedure. e. Remove and keep roller trays, to get access to the internal inspection area. Refer to 777 AMM 25-53-03 as an accepted procedure. f. Remove and keep insulation blankets in the bulk cargo compartment and aft cargo compartment to get access to the internal inspection area. Refer to 777 AMM 25-80-00 as an accepted procedure. PART 4: INTERNAL AND EXTERNAL DETAILED INSPECTIONS 1. Do detailed internal and external inspections in accordance with FIGURE 1. PART 5: CLEANING AND NEUTRALIZATION 1. Do cleaning and neutralization in accordance with FIGURE 2. NOTE: Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 36 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 37 PART 6: REPAIR 1. Do repairs of the fuselage skin in accordance with 777-200 SRM 53-00-01 or 777-300 SRM 53-00-01. 2. Do repairs of the fuselage stringer in accordance with 777-200 SRM 53-00-03 or 777-300 SRM 53-00-03. 3. Do repairs of the fuselage frame in accordance with 777-200 SRM 53-00-07 or 777-300 SRM 53-00-07. PART 7: RESTORATION 1. Apply protective finishes and install insulation blankets in accordance with FIGURE 3. PART 8: CLOSE ACCESS 1. Close access to the internal inspection area as follows: a. Install roller trays, Refer to 777 AMM 25-53-03 as an accepted procedure. b. Install the aft cargo floor panels. Refer to 777 AMM 25-52-10 as an accepted procedure c. Install the bulk cargo floor panels. Refer to 777 AMM 25-52-11 as an accepted procedure. d. Install the waste tank enclosure panels. Refer to 777 AMM 25-52-20 as an accepted procedure. e. Install the bulk cargo compartment and aft cargo compartment liners. Refer to 777 AMM 25-52-06 as an accepted procedure. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 37 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 38 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT $769 STA S-34L 1790 STA 1811 STA S-36L 1832 STA S-38L 1853 STA 1874 STA S-40L 1895 STA S-44L S-42L 1916 STA 1937 STA 1958STA S-46L 1979STA S-49L 200OSTA S-49R 2017 • STA 2033.5 STA 2050 EXTERIOR INSPECTION INTERIOR AND EXTERIOR INSPECTION 2519764 FIGURE 1: INTERNAL AND EXTERNAL DETAILED INSPECTION (SHEET 1 OF 5) Original Issue: April 20, 2017 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 777-53A0083 Work - See page 1 for details. 38 of 61 ### Page 39 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT S-38L ~S-40L STA 1769 -S-43L S-49R ГА STA 1895 STA 1916 STA 1937 SIA 1979 STA 1958 STA 2000 STA 2017 STA 2033.5 2520120 FIGURE 1: INTERNAL AND EXTERNAL DETAILED INSPECTION (SHEET 2 OF 5) Original Issue: April 20, 2017 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING Work - See page 1 for details. 777-53A0083 39 of 61 ### Page 40 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT S-42L S-43L S-44L S-45L S-46L S-47L ; S-48L S-49L S-49R S-48R S-47R TYPICAL FRAME (VIEW LOOKING FORWARD) A-A CARGO FLOOR STANCHION STANCHION BEAM (TYPICAL (TYPICAL VERTICAL TYPE) VERTICAL TYPE) SKIN (TYPICAL) / S-42L SHEAR TIE S-43L (TYPICAL) STRINGER CLIP S-44L (TYPICAL) S-45L INSPECTION AREA STRINGER (TYPICAL) S-46L S-47L 2567733 FIGURE 1: INTERNAL AND EXTERNAL DETAILED INSPECTION (SHEET 3 OF 5) Original Issue: April 20, 2017 Export Controlled ECCN: 9E991 - BOEING 777-53A0083 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 40 of 61 ### Page 41 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT CARGO FLOOR ‚BEAM STANCHION (TYPICAL DIAGONAL TYPE) STRINGER CLIP (TYPICAL) O S-47L S-47R S-48L S-49L S-49R S-48R SHEAR TIE SKIN STRINGER (TYPICAL) (TYPICAL) (TYPICAL) INSPECTION AREA FRAME • (TYPICAL) STRINGER CLIP (TYPICAL) ~ STRINGER (TYPICAL) FWD B-B 2567869 FIGURE 1: INTERNAL AND EXTERNAL DETAILED INSPECTION (SHEET 4 OF 5) Original Issue: April 20, 2017 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING Work - See page 1 for details. 777-53A0083 41 of 61 ### Page 42 The step numbers shown below agree with the numbers shown in the circle symbols in the figure. More DataQtyIdentificationNameTaskStep (a) (b) (c)--EXTERNAL SKINInspect1 WARNING: IF VACUUM WASTE SYSTEM CONTENTS SPILL OR LEAK IS FOUND DO NOT LET IT TOUCH YOU. YOU MUST WEAR CLOTHING THAT SUPPLIES PROTECTION. YOU MUST WEAR GLOVES AND A FACE SHIELD. THE VACUUM WASTE SYSTEM PRECHARGE CHEMICAL IS POISONOUS AND CAN CAUSE INJURIES TO PERSONS. IF IT GETS INTO YOUR EYES, FLUSH YOUR EYES WITH COOL WATER. GET MEDICAL AID IMMEDIATELY. (c) (d) (e)--INTERNAL STRUC- TURE Inspect2 (a) Do a detailed inspection for any corrosion or crack of the external skin, and for any existing reinforcing repair doubler that prevents the skin from being inspected, do a detailed inspection for any corrosion or crack of the repair doubler or doubler portion that resides within the detailed inspection area (b). (b) The external detailed inspection area is at the following locations: – From Station 1790 to Station 2033.5 from the edge of the overlapping skin at S-34L to S46L. – From Station 1853 to Station 1958 from S-46L to S-49R. (c) If any corrosion or crack is found extending beyond the inspection area, contact The Boeing Company for additional inspections and do the inspections. (d) Do a detailed inspection of the internal structure for any corrosion or crack this includes fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. For any existing reinforcing repair that prevents the skin, stringers, circumferential splice details, intercostals, or frames from being inspected, do a detailed inspection for any corrosion or crack of the reinforcing repair or reinforcing repair portion that resides within the detailed inspection area (e). (e) The internal detailed inspection area is at the following locations: – From Station 1874 to Station 2033.5 from S-38L to S-46L. – From Station 1853 to Station 1874 from S-35L to S-46L. – From Station 1790 to Station 1853 from S-35L to S-43L. – From Station 1853 to Station 1958 from S-46L to S-49R. FIGURE 1: INTERNAL AND EXTERNAL DETAILED INSPECTION (SHEET 5 OF 5) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 42 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 43 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT AND E 2000 1979 S56 1957 STA STA STA 2033.5 STA 1916 1895 • STA STA 1853 STA STA 1874 1832 STA STA 1790 1811 S-34L S-35L ~S-38L S-40L S-43L S-46L ~ S-49L *S-49R 2549292 FIGURE 2: CLEANING AND NEUTRALIZATION (SHEET 1 OF 6) Original Issue: April 20, 2017 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 777-53A0083 Work - See page 1 for details. 43 of 61 ### Page 44 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT S-42L S-43L S-44L S-45L S-46L S-47L ; S-48L S-49L S-49R S-48R S-47R TYPICAL FRAME (VIEW LOOKING FORWARD) A-A CARGO FLOOR STANCHION STANCHION BEAM (TYPICAL (TYPICAL VERTICAL TYPE) VERTICAL TYPE) SKIN (TYPICAL) / S-42L SHEAR TIE S-43L (TYPICAL) STRINGER CLIP S-44L (TYPICAL) S-45L CLEAN AND NEUTRALIZE STRINGER (TYPICAL) S-46L S-47L 2567886 FIGURE 2: CLEANING AND NEUTRALIZATION (SHEET 2 OF 6) Original Issue: April 20, 2017 Export Controlled ECCN: 9E991 - BOEING 777-53A0083 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 44 of 61 ### Page 45 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT CARGO FLOOR ‚BEAM STANCHION (TYPICAL DIAGONAL TYPE) STRINGER CLIP (TYPICAL) S-47L B S-47R S-48L S-49L S-49R S-48R SHEAR TIE SKIN STRINGER (TYPICAL) (TYPICAL) (TYPICAL) CLEAN AND NEUTRALIZE - FRAME STRINGER (TYPICAL) CLIP (TYPICAL) ~ STRINGER (TYPICAL) FWD B-B 2567887 FIGURE 2: CLEANING AND NEUTRALIZATION (SHEET 3 OF 6) Original Issue: April 20, 2017 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 777-53A0083 Work - See page 1 for details. 45 of 61 ### Page 46 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT 4 WASTE TANK ENCLOSURE PANELS (TYPICAL) \ BULK CARGO 4 SIDEWALL LINER A FLOOR PANEL (TYPICAL) (TYPICAL) AFT CARGO WALKWAY (TYPICAL) • ROLLER TRAY • (TYPICAL) DAFT CARDO FLOOR PANEL (TYPICAL) E 2549296 FIGURE 2: CLEANING AND NEUTRALIZATION (SHEET 4 OF 6) Original Issue: April 20, 2017 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 777-53A0083 Work - See page 1 for details. 46 of 61 ### Page 47 The step numbers shown below agree with the numbers shown in the circle symbols in the figure. More DataQtyIdentificationNameTaskStep WARNING: DO NOT LET THE VACUUM WASTE SYSTEM CONTENTS SPILL OR LEAK TOUCH YOU. YOU MUST WEAR CLOTHING THAT SUPPLIES PROTECTION. YOU MUST WEAR GLOVES AND A FACE SHIELD. THE VACUUM WASTE SYSTEM PRECHARGE CHEMICAL IS POI- SONOUS AND CAN CAUSE INJURIES TO PERSONS. IF IT GETS INTO YOUR EYES, FLUSH YOUR EYES WITH COOL WATER. GET MEDICAL AID IMMEDIATELY. (a)--INTERNAL STRUC- TURE Clean1 (b) (c)--SODIUM BICARBON- ATE SOLUTION Apply2 (d) (e)--INTERNAL STRUC- TURE Clean3 (f)--SIDEWALL LINERSClean4 (f)--WASTE TANK ENCLO- SURE PANELS Clean (f)--BULK CARGO FLOOR PANELS Clean (f)--AFT CARGO FLOOR PANELS Clean (f)--AFT CARGO WALK- WAY Clean (f)--ROLLER TRAYSClean (a) Clean any waste products on airplane structure or existing reinforcing repair. Wipe up excess fluids with cotton cloth, G50316 and discard cloth into plastic container for disposal. Refer to 777 AMM 51-00-57 as an accepted procedure. FIGURE 2: CLEANING AND NEUTRALIZATION (SHEET 5 OF 6) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 47 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 48 More DataQtyIdentificationNameTaskStep (b) Do these steps to neutralize any acidic or corrosive contents from the vacuum waste system: 1. Apply a neutralizing solution of sodium bicarbonate and water to the fuselage skins, stringers, circumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. Particular attention should be given to faying surface joints. Pressure application can used to flush the joint thoroughly. – Neutralizing Solution: Combine 14 ounces to 16 ounces of sodium bicarbonate to 1 gallon of water to achieve the desired mixture. It is acceptable if all of the sodium bicarbonate does not dissolve in the water. 2. Continue to apply the solution until bubbles stop, and allow the solution to remain on the surface for a minimum of five additional minutes. 3. Remove the neutralized mixture with a cotton cloth, or sponge. 4. Flush the area with clean water while rubbing the surface intermittently with a brush until all undissolved sodium bicarbonate has been removed from the structure. 5. Use litmus paper to find if the acid is neutralized. 6. Wipe dry with clean cotton cloth. (c) The area to neutralize is at the following internal locations: – From Station 1874 to Station 2033.5 from S-38L to S-46L. – From Station 1853 to Station 1874 from S-35L to S-46L. – From Station 1790 to Station 1853 from S-35L to S-43L. – From Station 1853 to Station 1958 from S-46L to S-49R. (d) Clean the airplane structure or existing reinforcing repair to remove unwanted materials. Refer to 777 AMM 25-52-00 as an accepted procedure. (e) The area to clean is at the following internal locations: – From Station 1874 to Station 2033.5 from S-38L to S-46L. – From Station 1853 to Station 1874 from S-35L to S-46L. – From Station 1790 to Station 1853 from S-35L to S-43L. – From Station 1853 to Station 1958 from S-46L to S-49R. (f) Clean any waste products on bulk cargo compartment and aft cargo compartment liners, panels, and walkways refer to 777 AMM 25-52-00 as an accepted procedure. FIGURE 2: CLEANING AND NEUTRALIZATION (SHEET 6 OF 6) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 48 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 49 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT 2033.5 STA 200019791958 1937 STA STA STA 1916 1895 STA STA STA 1853 STA 1874 1832 STA STA 1790 1811 S-34L S-35L ~S-38L S-40L *S-43L S-46L 4 ~S-49L *S-49R FIGURE 3: RESTORATION (SHEET 1 OF 4) Original Issue: April 20, 2017 Export Controlled ECCN: 9E991 - BOEING 777-53A0083 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 49 of 61 ### Page 50 The step numbers shown below agree with the numbers shown in the circle symbols in the figure. More DataQtyIdentificationNameTaskStep (a) (b)--INTERNAL STRUC- TURE Inspect1 (c)-CHROMATE CONVER- SION COAT, TYPE II, CLASS A CHEMICAL CONVER- SION COATING Apply2 (d)-BMS10-11 TYPE IPRIMERApply3 (e)-BMS3-29CORROSION INHIBIT- ING COMPOUND Apply4 FIGURE 3: RESTORATION (SHEET 2 OF 4) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 50 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 51 More DataQtyIdentificationNameTaskStep WARNING: IF VACUUM WASTE SYSTEM CONTENTS SPILL OR LEAK IS FOUND DO NOT LET IT TOUCH YOU. YOU MUST WEAR CLOTHING THAT SUPPLIES PROTECTION. YOU MUST WEAR GLOVES AND A FACE SHIELD. THE VACUUM WASTE SYSTEM PRECHARGE CHEMICAL IS POISONOUS AND CAN CAUSE INJURIES TO PERSONS. IF IT GETS INTO YOUR EYES, FLUSH YOUR EYES WITH COOL WATER. GET MEDICAL AID IMMEDIATELY. (f)--INSULATION BLAN- KETS Inspect5 WARNING: DO NOT USE DETERGENTS OR SOLVENTS TO CLEAN THE INSULATION BLANKET. IT CAN REMOVE THE FLAME RETARDANT OR LEAVE FLAMMABLE RESIDUES ON THE IN- SULATION BLANKET WHICH INCREASES THE RISK OF FIRE. THIS CAN CAUSE INJURIES TO PERSONNEL, AND DAMAGE TO EQUIPMENT. (g) (h)--INSULATION BLAN- KETS Clean6 (i)--INSULATION BLAN- KETS Install (Kept)7 (a) Do a detailed inspection of the protective finishes. Look for missing or breakdown of structural primers. Refer to 777 AMM 51-05-01 as an accepted procedure. (b) The internal detailed inspection area is at the following locations: – From Station 1874 to Station 2033.5 from S-38L to S-46L. – From Station 1853 to Station 1874 from S-35L to S-46L. – From Station 1790 to Station 1853 from S-35L to S-43L. – From Station 1853 to Station 1958 from S-46L to S-49R. (c) Apply a chemical conversion coat to areas of bare aluminum structure where the primer is missing. Refer to 777 AMM 51-21-04 as an accepted procedure. (d) Apply primer to areas where chemical conversion coat was applied and areas where there is a breakdown of structural primers. Refer to 777 AMM 51-24-10 as an accepted procedure. (e) Apply corrosion inhibiting compound to the entire area that was cleaned and neutralized including drain paths along the bottom centerline of the fuselage at BL=0 to the drain valves. Refer to 777 AMM 51-24- 09 as an accepted procedure. (f) Do a general visual inspection of the removed insulation blankets for contamination. Contamination includes staining, buildup of solid matter, lavatory waste debris or residual odor. Refer to 777 AMM 25-80-00 as an accepted procedure. (g) Clean serviceable insulation blankets If there are dust, lint or other loose unwanted material on the insu- lation blanket. Use a vacuum cleaner, a non-metallic soft brush, or cloth moist with clean water to remove the contamination. Refer to 777 AMM 25-80-00 as an accepted procedure. (h) Replace any insulation blankets that have contamination that changes the color and appearance of the insulation blanket. Refer to 777 AMM 25-80-00 as an accepted procedure. FIGURE 3: RESTORATION (SHEET 3 OF 4) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 51 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 52 More DataQtyIdentificationNameTaskStep (i) Install insulation blankets in the bulk cargo compartment and aft cargo compartment. Refer to 777 AMM 25-80-00 as an accepted procedure. FIGURE 3: RESTORATION (SHEET 4 OF 4) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 52 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 53 Logic diagrams are provided as an aid only. Information contained in Paragraph 1.E., Compliance is the primary source for compliance times. Information contained in Paragraph 3.B., Work Instructions is the primary source for tasks required for compliance. 1. The table below gives the description for the parts and conditions called out in the logic diagrams. DescriptionTitle OPERATOR'S MAINTENANCE PROCEDURE REVIEWPART 1 AIRPLANE RECORDS REVIEWPART 2 INTERNAL AND EXTERNAL DETAILED INSPECTIONSWORK PACKAGE 2 INTERNAL AND EXTERNAL DETAILED INSPECTIONSWORK PACKAGE 3 OPERATOR'S MAINTENANCE PROCEDURES ARE NOT ACCEPTABLECONDITION 1 OPERATOR'S MAINTENANCE PROCEDURES ARE ACCEPTABLECONDITION 2 AIRPLANE RECORDS DO NOT SHOW ALL VACUUM WASTE SYSTEM CONTENTS SPILLS AND LEAKS WERE CLEANED AND NEUTRALIZED AS DEFINED IN PART 2. CONDITION 2.1 AIRPLANE RECORDS SHOW NO VACUUM WASTE SYSTEM CONTENTS SPILL OR LEAK, OR ALL VACUUM WASTE SYSTEM CONTENTS SPILLS AND LEAKS WERE CLEANED AND NEUTRALIZED AS DEFINED IN PART 2. CONDITION 2.2 2. The table below gives the description for the flag notes called out in the logic diagram. DescriptionFlag Note Letter The following are Boeing approved procedures.(a) – 777 AMM 51-00-57 dated May 27, 2016 or later Boeing approved revisions that are published on myboeingfleet. – 777 AMM 05-51-57 dated May 27, 2016 or later Boeing approved revisions that are published on myboeingfleet. – 777 AMM 51-05-01 dated May 27, 2016 or later Boeing approved revisions that are published on myboeingfleet. – 777-200 SRM 51-20-18 dated May 25, 2016 or later FAA approved revi- sions that are published on myboeingfleet or 777-300 SRM 51-20-18 dated May 25, 2016 or later FAA approved revisions that are published on myboeingfleet. APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 1: OPERATOR'S MAINTENANCE PROCEDURES AND AIRPLANE MAINTENANCE RECORD REVIEW FOR VACUUM WASTE SYSTEM CONTENTS SPILL AND LEAK (SHEET 1 OF 2) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 53 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 54 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT ALL AIRPLANES WITHIN 375 DAYS AFTER THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. WHICHEVER OCCURS LATER WITHIN 2,250 DAYS DO PART 1 AFTER THE DATE OF ISSUANCE OF THE WITHIN 375 DAYS ORIGINAL AFTER THE ORIGINAL CERTIFICATE OF ISSUE DATE OF THIS AIRWORTHINESS OR SERVICE BULLETIN THE ORIGINAL EXPORT CONDITION 1 CONDITION 2 CERTIFICATE OF AIRWORTHINESS DO PART 2 AND WITHIN 435 DAYS AFTER THE AT THE TIME IN ORIGINAL ISSUE PARAGRAPH 1.E., CONDITION 2.1 CONDITION 2.2 DATE OF THIS COMPLIANCE, SERVICE BULLETIN. TABLE 2 AT THE TIME IN DO PARAGRAPH 1.E., CONDITION 1 (ACTION 1): WORK PACKAGE 2 COMPLIANCE, UPDATE THE TABLE 3 MAINTENANCE PROCEDURES TO THE BOEING DO PROCEDURES. APPROVED WORK PACKAGE 3 ¡(a) 2546358 APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 1: OPERATOR'S MAINTENANCE PROCEDURES AND AIRPLANE MAINTENANCE RECORD REVIEW FOR VACUUM WASTE SYSTEM CONTENTS SPILL AND LEAK (SHEET 2 OF 2) Original Issue: April 20, 2017 Export Controlled ECCN: 9E991 - BOEING 777-53A0083 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 54 of 61 ### Page 55 Logic diagrams are provided as an aid only. Information contained in Paragraph 1.E., Compliance is the primary source for compliance times. Information contained in Paragraph 3.B., Work Instructions is the primary source for tasks required for compliance. 1. The table below gives the description for the parts and conditions called out in the logic diagrams. DescriptionTitle INTERNAL AND EXTERNAL DETAILED INSPECTIONSPART 4 CLEANING AND NEUTRALIZATIONPART 5 REPAIRPART 6 RESTORATIONPART 7 NO CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONSCONDITION 3 ANY CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONSCONDITION 4 2. The table below gives the description for the flag notes called out in the logic diagram. DescriptionFlag Note Letter Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, cir- cumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. (a) APPENDIX B: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 2: INTERNAL AND EXTERNAL DETAILED INSPECTIONS OF THE AFT FUSELAGE STRUCTURE FOR ANY CORROSION OR CRACK (SHEET 1 OF 4) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 55 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 56 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT TABLE 2 ALL AIRPLANES THAT HAVE ACCUMULATED LESS THAN 4,015 DAYS AFTER THE DATE OF ISSUANCE OF THE ORIGINAL CERTIFICATE OF AIRWORTHINESS OR THE ORIGINAL EXPORT CERTIFICATE OF AIRWORTHINESS. ON THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. WHICHEVER OCCURS LATER WITHIN 2,250 DAYS AFTER THE DATE OF ISSUANCE OF THE WITHIN 1,100 DAYS ORIGINAL CERTIFICATE AFTER THE ORIGINAL OF AIRWORTHINESS ISSUE DATE OF THIS OR THE ORIGINAL SERVICE BULLETIN. EXPORT CERTIFICATE DO PART 4 OF AIRWORTHINESS C ALL AIRPLANES THAT HAVE ACCUMULATED 4,015 DAYS OR MORE, BUT LESS THAN 5,840 DAYS AFTER THE DATE OF ISSUANCE OF THE ORIGINAL CERTIFICATE OF AIRWORTHINESS OR THE ORIGINAL EXPORT CERTIFICATE OF CONDITION 3 AIRWORTHINESS. ON THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. WITHIN 550 DAYS AFTER THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. CONDITION 4 B ALL AIRPLANES THAT HAVE ACCUMULATED 5,840 DAYS OR MORE AFTER THE DATE OF ISSUANCE OF THE ORIGINAL CERTIFICATE OF AIRWORTHINESS OR THE ORIGINAL EXPORT CERTIFICATE OF AIRWORTHINESS. ON THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. WITHIN 375 DAYS AFTER THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. 2546951 APPENDIX B: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 2: INTERNAL AND EXTERNAL DETAILED INSPECTIONS OF THE AFT FUSELAGE STRUCTURE FOR ANY CORROSION OR CRACK (SHEET 2 OF 4) Original Issue: April 20, 2017 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 777-53A0083 Work - See page 1 for details. 56 of 61 ### Page 57 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT BEFORE FURTHER OPTION 2 (ACTION 1): FLIGHT DO PART 7 OPTION 1 (ACTION1): DO PART 5 TO THE NOT TO EXCEED ENTIRE INSPECTION 375 DAYS AREA OPTION 1 (ACTION 2): OPTION 2 (ACTION 2): DO PART 7 REPEAT PART 4 (a) NO FURTHER C ACTION REQUIRED 2546948 APPENDIX B: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 2: INTERNAL AND EXTERNAL DETAILED INSPECTIONS OF THE AFT FUSELAGE STRUCTURE FOR ANY CORROSION OR (SHEET 3 OF 4) Original Issue: April 20, 2017 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 777-53A0083 Work - See page 1 for details. 57 of 61 ### Page 58 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT BEFORE FURTHER BEFORE FURTHER FLIGHT FLIGHT OPTION 4 (ACTION 1): OPTION 3 (ACTION 1): DO PART 5 TO THE DO PART 5 TO THE CONTAMINATED AREA ENTIRE INSPECTION ONLY AREA OPTION 4 (ACTION 2): OPTION 3 (ACTION 2): DO PART 6 DO PART 6 OPTION 4 (ACTION 3): DO PART 7 OPTION 3 (ACTION 3): DO PART 7 NOT TO EXCEED 375 DAYS. NO FURTHER ACTION REQUIRED OPTION 4 (ACTION 4): REPEAT PART 4 (a) 2546949 APPENDIX B: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 2: INTERNAL AND EXTERNAL DETAILED INSPECTIONS OF THE AFT FUSELAGE STRUCTURE FOR ANY CORROSION OR CRACK (SHEET 4 OF 4) Original Issue: April 20, 2017 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 777-53A0083 Work - See page 1 for details. 58 of 61 ### Page 59 Logic diagrams are provided as an aid only. Information contained in Paragraph 1.E., Compliance is the primary source for compliance times. Information contained in Paragraph 3.B., Work Instructions is the primary source for tasks required for compliance. 1. The table below gives the description for the parts and conditions called out in the logic diagrams. DescriptionTitle INTERNAL AND EXTERNAL DETAILED INSPECTIONSPART 4 CLEANING AND NEUTRALIZATIONPART 5 REPAIRPART 6 RESTORATIONPART 7 NO CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONSCONDITION 5 ANY CORROSION OR CRACK FOUND DURING PART 4 INSPECTIONSCONDITION 6 2. The table below gives the description for the flag notes called out in the logic diagram. DescriptionFlag Note Letter No further action is required after completion of PART 7.(a) Accomplishment of PART 5: CLEANING AND NEUTRALIZATION to the entire internal inspection area is terminating action for inspections in this service bulletin. PART 5 must be accomplished to the fuselage skins, stringers, cir- cumferential splice details, intercostals, frames and all components that attach to the frame such as stringer clips, shear ties, and stanchions. (b) APPENDIX C: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 3: INTERNAL AND EXTERNAL DETAILED INSPECTIONS OF THE AFT FUSELAGE STRUCTURE FOR ANY CORROSION OR CRACK (SHEET 1 OF 3) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 20, 2017 777-53A0083 59 of 61 BOEING SERVICE BULLETIN 777-53A0083 ALERTALERT ### Page 60 (OCR) BOEING SERVICE BULLETIN 777-53A0083 ALERT ALERT TABLE 3 ALL AIRPLANES THAT HAVE ACCUMULATED LESS THAN 4,015 DAYS AFTER THE DATE OF ISSUANCE OF THE ORIGINAL CERTIFICATE OF AIRWORTHINESS OR THE ORIGINAL EXPORT CERTIFICATE OF AIRWORTHINESS. ON THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. WHICHEVER OCCURS LATER WITHIN 2,250 DAYS AFTER THE DATE OF ISSUANCE OF THE WITHIN 1,100 DAYS ORIGINAL CERTIFICATE AFTER THE ORIGINAL OF AIRWORTHINESS ISSUE DATE OF THIS OR THE ORIGINAL SERVICE BULLETIN. EXPORT CERTIFICATE OF AIRWORTHINESS ALL AIRPLANES THAT HAVE ACCUMULATED 4,015 DAYS OR MORE, BUT LESS THAN 5,840 DAYS AFTER THE DATE OF ISSUANCE OF THE ORIGINAL CERTIFICATE OF AIRWORTHINESS OR THE ORIGINAL EXPORT CERTIFICATE OF (a) AIRWORTHINESS. ON THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. WITHIN 550 DAYS AFTER THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. ALL AIRPLANES THAT HAVE ACCUMULATED 5,840 DAYS OR MORE AFTER THE DATE OF ISSUANCE OF THE ORIGINAL CERTIFICATE OF AIRWORTHINESS OR THE ORIGINAL EXPORT CERTIFICATE OF AIRWORTHINESS. ON THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. WITHIN 375 DAYS AFTER THE ORIGINAL ISSUE DATE OF THIS SERVICE BULLETIN. 2546950 APPENDIX C: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE, TABLE 3: INTERNAL AND EXTERNAL DETAILED INSPECTIONS OF THE AFT FUSELAGE STRUCTURE FOR ANY CORROSION OR CRACK (SHEET 2 OF 3) Original Issue: April 20, 2017 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 777-53A0083 Work - See page 1 for details. 60 of 61 The text continues at https://openairdocs.org/service-documents/boeing/777-53a0083/file/74ab3a7d1930.md?from=61 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. 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