# Boeing Alert Service Bulletin 747-57A2357: No revision named - Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2016-9394; AD 2017-09-10 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Boeing Alert Service Bulletin 747-57A2357](https://openairdocs.org/service-documents/boeing/747-57a2357.md) - Title as filed: SB-747-57A2357 R00 - Pages: 49 - PDF: https://openairdocs.org/files/sha256/eb/18/eb18e9198b3af4f9c9f4a028a887bb1f31303c173c84c62a046b067ebab72195 - Page: https://openairdocs.org/service-documents/boeing/747-57a2357/file/eb18e9198b3a ## 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 747 Service Bulletin ALERT Number: 747-57A2357 Original Issue: September 12, 2016 ATA System: 5711 SUBJECT: WINGS - Wing Spars - Front Spar Station Inboard 628 to Front Spar Station Inboard 713 - Front Spar Web Inspection 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 © 2016 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 Unpublished Work.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: September 12, 2016 747-57A2357 1 of 49 3.0 ### Page 2 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 2 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT BLANK PAGE ### Page 3 Table of Contents Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2. Data Supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 17 K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 M. Software Accomplishment Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 C. Parts Necessary for Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 19 3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 19 3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 FIGURE 1: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 FIGURE 2: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - SEALANT APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 FIGURE 3: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 FIGURE 4: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - SEALANT APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE: TABLE 1: FRONT SPAR WEB INSPECTION - LEFT & RIGHT SIDE - FSSI 628 STIFFENER TO FSSI 713 FITTING . . 48 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 3 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 4 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 4 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT BLANK PAGE ### Page 5 Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-57A2357Original Issue: September 12, 2016 ATA System: 5711 SUBJECT: WINGS - Wing Spars - Front Spar Station Inboard 628 to Front Spar Station Inboard 713 - Front Spar Web Inspection 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 Accomplishment of the inspections in this service bulletin will make sure any crack in the front spar web from Front Spar Station Inboard (FSSI) 628 to FSSI 713 is found and repaired. If this service bulletin is not accomplished, a crack in the front spar web in this location could grow undetected and allow a fuel leak which could lead to a fire. One operator found a fuel leak which led to the discovery of a 13.4 inch long crack in the left wing front spar web inboard of pylon number 2 between FSSI 655.75 and FSSI 660. The airplane had 13,909 total flight-cycles and 107,151 total flight-hours. Inspections of the front spar web between FSSI 628 and FSSI 713 will supersede 747 Supplemental Structural Inspection Document (SSID) inspections of Structural Significant Items (SSI) W-24A, W-24B, and W-24C. The cracking addressed by this service bulletin is similar to the cracking addressed by Service Bulletins 747-57A2266 and 747-57A2311. Boeing Fleet Team Digest (FTD) 747-400 FTD 57-15005 is related to this service bulletin. Boeing Service Related Problem (SRP) 747-SRP-57-0285 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 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 5 of 49 ### Page 6 ReferenceAffectedPlanning Data 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 ACTION Get access to the forward side of the left and right wing spar web from stiffener at FSSI 628 to the fittings at FSSI 713. Remove the fillet seals from the inboard and outboard edges of the stiffeners, fittings and from the inner edge of the upper and lower chords attached to the web from the outboard edge of the stiffener at FSSI 628 to the inboard edge of the fittings at FSSI 713. Also remove cap seals from rib post fastener heads at FSSI 656 and FSSI 684. Do the following detailed, Ultrasonic (UT) and High Frequency Eddy Current (HFEC) inspections on each wing: – Do a detailed inspection of the front spar web for any crack from the outboard edge of the stiffener at FSSI 628 to the inboard edge of the fittings at FSSI 713. – Do a UT inspection for any crack in the front spar web under the stiffeners between FSSI 628 and FSSI 713 and under the outer edges of the upper link fittings and the outer edges of the midspar back up fittings. – Do a UT inspection for any crack in the front spar web under the upper and lower chords from FSSI 628 to FSSI 713. – Do a HFEC surface inspection for any crack in the front spar web at the edges of the upper and lower chords from FSSI 628 to FSSI 713. – Do a HFEC inspection for any crack in the front spar web around the fastener heads common to the FSSI 656 rib post and FSSI 684 rib post. If any crack is found, contact The Boeing Company for repair instructions and do the repair. Repeat the inspections in unrepaired areas. If no crack is found, repeat the inspections. EFFECTIVITY All 747-400/400D/400F Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s). Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 6 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 7 COMPLIANCE Federal Aviation Administration (FAA) Airworthiness Directive AD 2004-07-22 R1 is related to this service bulletin. The effective date of AD 2004-07-22 R1 is January 22, 2008. 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 given in this service bulletin. MANPOWER Elapsed HoursTotal Task HoursAirplanes 41.880.8Group 1 Refer to Paragraph 1.G., Manpower. 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: September 12, 2016 747-57A2357 7 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 8 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT DO DETAILED, HIGH FREQUENCY EDDY CURRENT AND ULTRASONIO INSPECTIONS FOR ANY CRACK IN THE WEB OF THE FRONT SPAR. IF ANY CRACK FOUND, CONTACT BOEING FOR REPAIR INSTRUCTIONS AND DO THE REPAIR. REPEAT INSPECTIONS IN UNREPAIRED AREAS. SEAL RIB SSI OUTBOARD UPPER 713 LINK FSSI FITTINGS 688 UPPER FSSI CHORD 711 RIB POST INBOARD FSSI 684 FITTINGS MIDSPAR BACK-UP SEAL RIB WEB FSSI 656 RIB POST 628 FSSI RIB POST INDE CHORD LOWER RIGHT WING OPPOSITE LEFT WING SHOWN FRONT SPAR WEB 2500816 Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-57A2357 Work - See page 1 for details. 8 of 49 ### Page 9 Commercial Airplanes 747 Service Bulletin ALERT Number: 747-57A2357 Original Issue: September 12, 2016 ATA System: 5711 SUBJECT: WINGS - Wing Spars - Front Spar Station Inboard 628 to Front Spar Station Inboard 713 - Front Spar Web Inspection 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 all 747-400/400D/400F airplanes in 1 Group. The Variable Numbers and Group Information for the applicable airplanes is given below. Refer to Service Bulletin Index D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data. DESCRIPTIONCONFIGURATIONGROUP All 747-400/400D/400F Airplanes.-1 Airplane Models: 747-400, 747-400D, 747-400F GroupVariable Number 1RF001 - RF006 1RL401 - RL403 1RL411 - RL436 1RL451 - RL456 1RL461 - RL462 1RL471 - RL481 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 9 of 49 ### Page 10 GroupVariable Number 1RL491 - RL492 1RL501 - RL502 1RL511 - RL516 1RL521 - RL522 1RL531 - RL534 1RL551 1RL561 - RL568 1RL571 - RL572 1RL576 - RL577 1RL579 1RL581 - RL586 1RL651 - RL655 1RL671 - RL675 1RL681 - RL684 1RL751 - RL752 1RM001 - RM007 1RM010 - RM013 1RM021 - RM024 1RM026 - RM030 1RM036 - RM045 1RM051 - RM053 1RM071 1RM081 - RM084 1RM091 1RM096 - RM097 1RM116 - RM117 1RM126 - RM132 1RM136 - RM147 1RM156 - RM158 1RM166 - RM177 1RM191 - RM192 1RM231 - RM233 1RM241 - RM246 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 10 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 11 GroupVariable Number 1RM261 - RM264 1RM316 - RM318 1RM331 - RM333 1RM341 1RM351 - RM355 1RM366 - RM367 1RM401 - RM403 1RM426 1RM431 1RM441 - RM443 1RM445 1RM801 - RM803 1RM811 - RM813 1RM851 - RM859 1RM861 - RM863 1RM871 - RM899 1RM901 - RM906 1RM911 1RR701 1RR721 - RR724 1RR746 - RR748 1RR851 - RR856 1RR861 - RR862 1RR951 - RR952 1RT001 - RT014 1RT021 - RT022 1RT031 - RT035 1RT041 - RT047 1RT061 1RT071 - RT075 1RT101 - RT103 1RT121 1RT131 - RT137 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 11 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 12 GroupVariable Number 1RT151 - RT152 1RT161 - RT168 1RT401 - RT412 1RT431 - RT447 1RT451 - RT469 1RT471 - RT499 1RT501 - RT535 1RT551 - RT568 1RT571 - RT591 1RT601 - RT657 1RT671 - RT673 1RT681 - RT682 1RT691 - RT699 1RT701 - RT704 1RT711 - RT717 1RT741 - RT757 1RT776 - RT777 1RT781 - RT784 1RT801 - RT803 1RT811 - RT814 1RT831 - RT837 1RT861 - RT864 1RT876 - RT880 1RT931 - RT932 1RT945 - RT949 1RT951 - RT955 1RT966 - RT967 1RU001 - RU006 1RU016 - RU017 1RU031 - RU032 1RU051 - RU052 1RU059 - RU062 1RU081 - RU083 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 12 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 13 GroupVariable Number 1RU101 - RU102 1RU121 - RU132 1RU801 - RU809 1RU831 - RU841 2. Spares Affected None. B. Concurrent Requirements None. C. Reason Accomplishment of the inspections in this service bulletin will make sure any crack in the front spar web from Front Spar Station Inboard (FSSI) 628 to FSSI 713 is found and repaired. If this service bulletin is not accomplished, a crack in the front spar web in this location could grow undetected and allow a fuel leak which could lead to a fire One operator found a fuel leak which led to the discovery of a 13.4 inch long crack in the left wing front spar web inboard of pylon number 2 between FSSI 655.75 and FSSI 660. The airplane had 13,909 total flight-cycles and 107,151 total flight-hours. Inspections of the front spar web between FSSI 628 and FSSI 713 will supersede 747 Supplemental Structural Inspection Document (SSID) inspections of Structural Significant Item (SSI) W-24B between FSSI 655 and FSSI 710. The cracking addressed by this service bulletin is similar to the cracking addressed by Service Bulletins 747-57A2266 and 747-57A2311. Boeing Fleet Team Digest (FTD) 747-400 FTD 57-15005 is related to this service bulletin. Boeing Service Related Problem (SRP) 747-SRP-57-0285 is related to this service bulletin. D. Description Get access to the forward side of the left and right wing spar web from stiffener at FSSI 628 to the fittings at FSSI 713. Remove the fillet seals from the inboard and outboard edges of the stiffeners, fittings and from the inner edge of the upper and lower chords attached to the web from the outboard edge of the stiffener at FSSI 628 to the inboard edge of the fittings at FSSI 713. Also remove cap seals from rib post fastener heads at FSSI 656 and FSSI 684. Do the following detailed, Ultrasonic (UT) and High Frequency Eddy Current (HFEC) inspections on each wing: Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 13 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 14 – Do a detailed inspection of the front spar web for any crack from the outboard edge of the stiffener at FSSI 628 to the inboard edge of the fittings at FSSI 713. – Do a UT inspection for any crack in the front spar web under the stiffeners between FSSI 628 and FSSI 713 and under the outer edges of the upper link fittings and the outer edges of the midspar back up fittings. – Do a UT inspection for any crack in the front spar web under the upper and lower chords from FSSI 628 to FSSI 713. – Do a HFEC surface inspection for any crack in the front spar web at the edges of the upper and lower chords from FSSI 628 to FSSI 713. – Do a HFEC inspection for any crack in the front spar web around the fastener heads common to the FSSI 656 rib post and FSSI 684 rib post. If any crack is found, contact The Boeing Company for repair instructions and do the repair. Repeat the inspections in unrepaired areas. If no crack is found, repeat the inspections. The work in this service bulletin is done in the maintenance zone(s) given below. Affected Maintenance Zones ZoneModel 511, 521, 611, 621747-400, 747-400D, 747-400F E. Compliance Federal Aviation Administration (FAA) Airworthiness Directive AD 2004-07-22 R1 is related to this service bulletin. The effective date of AD 2004-07-22 R1 is January 22, 2008. 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. A logic diagram showing compliance tasks and compliance times is included as an aid in APPENDIX A. 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. Accomplish the required action(s), based on the applicable condition(s) in Table 1, in accordance with Paragraph 3. Accomplishment Instructions. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 14 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 15 Table 1: Front Spar Web Detailed Inspection, Ultrasonic Inspection, and High Frequency Eddy Current (HFEC) Inspection for Any Crack - Left and Right Wing - Front Spar Station Inboard 628 to Front Spar Station Inboard 713 Repeat Interval (Not to Exceed) Compliance Time (Whichever Occurs Later) ActionCondition -Within 6 months after the original issue date of this service bul- letin. Before 10,000 total flight cycles or 80,000 total flight hours, whichever oc- curs first. Do PART 2: FRONT SPAR WEB INSPEC- TIONS for any crack. All Airplanes 1,200 flight cycles.-Repeat PART 2: FRONT SPAR WEB INSPEC- TIONS for any crack. CONDITION 1: NO CRACK FOUND -Before further flightACTION 1: Contact The Boeing Company for re- pair instructions and do the repair CONDITION 2: ANY CRACK FOUND 1,200 flight cycles-ACTION 2: Repeat PART 2: FRONT SPAR WEB INSPECTIONS for any crack at the unrepaired areas. 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. In addition, The Manager of the FAA Seattle (ACO) approves the accomplishment of the applicable inspection procedures of this service bulletin as an alternative method of compliance (AMOC) to the accomplishment of the corresponding inspection requirements of structurally significant items (SSI) W-24A, W-24B, and W-24C of Boeing supplemental structural inspection document (SSID) D6-35022, Revision G, dated December 2000 required by paragraphs (h) and (i) of FAA AD 2004-07-22 R1. This AMOC only applies to the areas inspected as given in this service bulletin. When this service bulletin specifies contacting Boeing for repair instructions, the repair instructions must be in accordance with FAA-approved procedures as required by paragraph (j) of the AD. All provisions of AD 2004-07-22 R1 that are not specifically referenced in this paragraph, remain fully applicable and must be complied with. Operators must revise their FAA approved maintenance or inspection program with these alternative inspections prior to threshold. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 15 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 16 G. Manpower The table below shows an estimate of the task hours necessary to do this inspection for each Airplane. This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator task hour data if necessary. The estimate does not include lost time. These are some examples of lost time: • Time to adjust to the workplace • Time to schedule the work • Time to inspect the work • Time to cure the materials • Time to make the parts • Time to find the tools Elapsed HoursTask HoursNumber of PersonsTask 6.513.02Open Access 13.026.02Figure 1 1.41.41Figure 2 13.026.02 1.41.41Figure 4 6.513.02Close Access 41.880.8TOTAL FOR EACH AIRPLANE H. Weight and Balance Changes None. I. Electrical Load Data Not changed. J. References 1. Existing Data: a. Boeing Service Bulletin 747-57A2266, 747-57A2311 b. Boeing Service Letter 747-SL-51-048 c. Boeing Service Related Problem (SRP) 747-SRP-57-0285 d. Federal Aviation Administration (FAA) Airworthiness Directive (AD) 2004-07-22 R1 e. Service Bulletin Index D6-30300 f. Standard Overhaul Practices Manual (SOPM) 20-30-03, 20-50-19 g. 747 Non-Destructive Testing (NDT) Manual Part 4, 57-10-09, Part 4, 57-10-25, Part 6, 51-00-00 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 16 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 17 h. 747-400 Aircraft Maintenance Manual (AMM) 06-09-08, 27-81-00, 28-11-00 i. 747-400 Fleet Team Digest (FTD) 57-15005 2. Data Supplied with this Service Bulletin: None. 3. Installation Drawings Used in the Preparation of this Service Bulletin: TitleDrawing Number FRONT SPAR INSTL - WING112U2000 The table above lists applicable drawings used to prepare this service bulletin. The drawings are not necessary to make the specified changes, and are not supplied with this service bulletin. The 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: September 12, 2016 747-57A2357 17 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 18 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 18 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT BLANK PAGE ### Page 19 2. MATERIAL INFORMATION A. Material - Price and Availability The operator can supply the parts and materials shown in Paragraph 2.C., Parts Necessary for Each Airplane if needed. As an alternative, operators can purchase the parts from Boeing Spares. This service bulletin does not show the Boeing price and supply data. B. Industry Support Information Boeing warranty remedies are not available for the inspection 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 (a)Sealant1 GallonBMS 5-95, TYPE I, CLASS B (a) Refer to the Qualified Products List at the end of the Boeing Material Specification (BMS) for supplier data. 3. Parts Modified and Reidentified None. 4. Parts Removed and Not Replaced None. D. Parts Necessary to Change Spares None. 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: September 12, 2016 747-57A2357 19 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 20 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 20 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT BLANK PAGE ### Page 21 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. 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 747 Structural Repair Manual, Chapter 51. — Values for airframe maintenance tasks are included in Chapter 20 of 747 Aircraft Maintenance Manual (AMM). — Values for electrical maintenance tasks are included in Chapter 20 of Standard Wiring Practices Manual (SWPM). — Values for engine maintenance tasks are included in Chapter 70 of 747 Aircraft Maintenance Manual (AMM). — Non-standard torque values for maintenance tasks are included in the applicable installation step. 4. 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. 5. 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. 6. Boeing Service Letter 747-SL-51-048, 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. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 21 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 22 7. Refer to APPENDIX A for logic diagram(s). 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. 8. The instructions in Paragraph 3.B., Work Instructions and the figures can include operation of tools or test equipment. Boeing Engineering Tool Drawings, the Illustrated Tool and Equipment Manual, and the Special Tool and Ground Handling Drawing Index contain data on versions of the tools or test equipment that you can use. It is permitted to use replaced tools. It is not permitted to use superseded tools. 9. 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. 10. Use of colors in Figures is based on guidance from the ATA e-Business Program (ATA) iSpec 2200. 11. 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. 12. The compliance times for the actions in Paragraph 3.B., WORK INSTRUCTIONS are in Paragraph 1.E., Compliance. 13. 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. B. WORK INSTRUCTIONS 1. Do PART 1: OPEN ACCESS 2. RC - Do PART 2: FRONT SPAR WEB INSPECTIONS for any crack. a. CONDITION 1: NO CRACK FOUND. (1) Repeat PART 2: FRONT SPAR WEB INSPECTIONS. b. CONDITION 2: ANY CRACK FOUND. (1) ACTION 1: Contact The Boeing Company for repair instructions and do the repair. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 22 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 23 (2) ACTION 2: Repeat PART 2 FRONT SPAR WEB INSPECTIONS for any crack at the unrepaired areas. 3. Do PART 3: CLOSE ACCESS 4. Put the airplane back to a serviceable condition. PART 1: OPEN ACCESS 1. Extend and deactivate Krueger and variable camber flaps. Refer to 747-400 AMM 27-81-00 as an accepted procedure. 2. Remove access panels 511BB, 511CT, 511CTA, 521AB, and 521FB (left wing) or 611BB, 611CT, 611CTA, 621AB,and 621FB (right wing). Refer to 747-400 AMM 06-09-08 as an accepted procedure. PART 2: FRONT SPAR WEB INSPECTIONS 1. Do a Detailed Inspection, an Ultrasonic (UT) Inspection, and a High Frequency Eddy Current Inspection of the forward side of the front spar web for any crack from Front Spar Station Inboard (FSSI) 628 to FSSI 713 on the left and right wing in accordance with FIGURE 1 and FIGURE 3. PART 3: CLOSE ACCESS 1. Apply sealant on all areas from where it was removed in accordance with FIGURE 2 and FIGURE 4. 2. Install access panels 511BB, 511CT, 511CTA, 521AB, and 521FB (left wing) or 611BB, 611CT, 611CTA, 621AB,and 621FB (right wing). Refer to 747-400 AMM 06-09-08 as an accepted procedure. 3. Activate and retract Krueger and variable camber flaps. Refer to 747-400 AMM 28-11-00 as an accepted procedure. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 23 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 24 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT UPPER LINK _ OUTBOARD FITTINGS SEAL RIB FSSI 688 EN UPPER FSSI CHORD 711 RIB POST FSSI MIDSPAR 684 BACK-UP INBOARD FITTINGS SEAL RIB WEB FSSI RIB POST 656 FSSI RIB POST 628 LOWER CHORD 2500817 FIGURE 1: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 1 OF 8) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-57A2357 Work - See page 1 for details. 24 of 49 ### Page 25 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT UPPER CRACK CHORD (TYPICAL) FSSI FSSI 628 637 FSSI FSSI FSSI FSSI FSSI FSSI 646 656 661 668 675 684 + UPPER RIB POST LINK RIB POST FITTING STIFFENER LOWER (6 LOCATIONS) CHORD INBD (LOOKING AFT) A-A 2500828 FIGURE 1: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 2 OF 8) Original Issue: September 12, 2016 PROPRIETARY - Copyright ® Unpublished Export Controlled ECCN: 9E991 - BOEING 747-57A2357 Work - See page 1 for details. 25 of 49 ### Page 26 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT FSSI RIB POST FSSI RIB POST 684 713 FSSI I 711 + + + + + + + + UPPER LINK MID SPAR FITTING BACK UP FITTINGS STIFFENER FITTINGS INBD (LOOKING AFT) B-B 2500829 FIGURE 1: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 3 OF 8) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-57A2357 Work - See page 1 for details. 26 of 49 ### Page 27 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT UPPER CRACK 12 LOCATIONS CHORD (TYPICAL) FSSI FSSI 628 637 FSSI FSSI FSSI FSSI FSSI FSSI 646 656 661 668 675 684 XXXXX! UPPER RIB POST LINK FITTING RIB POST (6 LOCATIONS) STIFFENER LOWER CHORD INBD (LOOKING AFT) C-C 1.00 STIFFENER TYPICAL INSPECTION AREA LOWER CHORD FIGURE 1: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 4 OF 8) Original Issue: September 12, 2016 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-57A2357 Work - See page 1 for details. 27 of 49 ### Page 28 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT RIB POST ( FSSI RIB POST FSSI 684 713 UPPER LINK FSSI FITTINGS 711 + -‡- + + + pass + + + + + + + + + + + + 6 LOCATIONS + + + + + + MID SPAR FITTING BACK UP STIFFENER FITTINGS INBD (LOOKING AFT) D-D 1.00 STIFFENER TYPICAL INSPECTION AREA B CHORD LOWER 2501317 FIGURE 1: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 5 OF 8) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-57A2357 Work - See page 1 for details. 28 of 49 ### Page 29 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT 11 LOCATIONS (6) CHORD UPPER CRACK (TYPICAL) FSSI FSSI 628 637 ESSI FSSI FSSI FSSI FSSI 656 661 668 675 684 RIB POST LOWER UPPER STIFFENER CHORD RIB POST LINK (6 LOCATIONS) FITTING 12 LOCATIONS NBD (LOOKING AFT) E-E STIFFENER TYPICAL INSPECTION AREA LOWER CHORD FIGURE 1: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 6 OF 8) Original Issue: September 12, 2016 PROPRIETARY - Copyright ® Unpublished Export Controlled ECCN: 9E991 - BOEING 747-57A2357 Work - See page 1 for details. 29 of 49 ### Page 30 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT 6 LOCATIONS FSSI 684 FSSI 713 FSSI RIB POST 711 RIB POST + + FITTING 5) 6 LOCATIONS UPPER LINK( FITTINGS STIFFENER MID SPAR BACK UP FITTINGS INBD (LOOKING AFT) F-F STIFFENER TYPICAL D LOWER CHORD INSPECTION AREA FIGURE 1: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 7 OF 8) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-57A2357 Work - See page 1 for details. 30 of 49 ### Page 31 More DataQtyIdentificationNameTaskStep WARNING: DO NOT USE METAL TOOLS TO REMOVE SEALANT. IF A METAL TOOL IS USED TO RE- MOVE SEALANT, IT COULD SCRAPE OR GOUGE THE STRUCTURE UNDER THE SEALANT. A SCRAPE OR GOUGE IN THE STRUCTURE COULD LEAD TO A CRACK WHICH COULD CAUSE A FUEL LEAK WHICH COULD CAUSE A FIRE. (a)--SealantRemove1 (b)--WebClean2 (c)--WebInspect3 (d)--WebInspect4 (e)--WebInspect5 (f)--WebInspect6 (g)--WebInspect7 (h)--WebInspect8 (a) Remove the fillet seals common to the web, stiffeners, fittings, and upper and lower chords and remove cap seals from the rib post fastener heads to get access to the inspection area. Refer to SOPM 20-50-19 as an accepted procedure. (b) Clean the inspection area. Refer to SOPM 20-30-03 as an accepted procedure. (c) Do a detailed inspection for any crack in the front spar web. (d) Do a High Frequency Eddy Current (HFEC) surface inspection for any crack in the front spar web at the edges of the upper and lower chords in accordance with 747 NDT Manual Part 6, 51-00-00, Procedure 4 or 23. Do the inspection along the edge of the chords where the sealant was removed. (e) Do an Ultrasonic inspection for any crack in the front spar web under the upper and lower chords in ac- cordance with 747 NDT Manual Part 4, 57-10-25. Do the inspection along the edge of the chords where the sealant was removed. (f) Do an Ultrasonic inspection for any crack in the front spar web under the stiffeners and fittings in accordance with 747 NDT Manual Part 4, 57-10-25. (g) Do a HFEC surface inspection for any crack in the front spar web around the fastener heads in accordance with 747 NDT Manual Part 6, 51-00-00, Procedure 4 or 23 . Do the inspection around all fasteners between the upper and lower chords. (h) Do an Ultrasonic inspection for any crack in the front spar web under the upper link fittings and mid spar back up fittings in accordance with 747 NDT Manual Part 4, 57-10-09. FIGURE 1: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 8 OF 8) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 31 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 32 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT LINK UPPER OUTBOARD FITTINGS SEAL RIB FSSI 688 UPPER FSSI CHORD 711 RIB POST FSSI MIDSPAR 684 BACK-UP INBOARD FITTINGS SEAL RIB WEB FSSI 656 RIB POST FSSI RIB POST 628 LOWER CHORD 2502824 FIGURE 2: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - SEALANT APPLICATION (SHEET 1 OF 4) Original Issue: September 12, 2016 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-57 A2357 Work - See page 1 for details. 32 of 49 ### Page 33 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT UPPER CRACK CHORD (TYPICAL) FSSI FSSI 628 637 FSSI FSSI FSSI FSSI 646 656 661 684 UPPER RIB POST LINK RIB POST FITTING STIFFENER LOWEF (6 LOCATIONS) CHORT INBD (LOOKING AFT) A-A 2502826 FIGURE 2: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - SEALANT APPLICATION (SHEET 2 OF 4) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING 747-57A2357 PROPRIETARY - Copyright ® Unpublished Work - See page 1 for details. 33 of 49 ### Page 34 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT FSSI RIB POST FSSI RIB POST 684 FSSI 711 713 - + + - + + +i + + + + + + UPPER LINK FITTINGS STIFFENER MID SPAR FITTINGS BACK UP FITTING INBD (LOOKING AFT) B-B 2502827 FIGURE 2: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - SEALANT APPLICATION (SHEET 3 OF 4) Original Issue: September 12, 2016 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-57A2357 Work - See page 1 for details. 34 of 49 ### Page 35 More DataQtyIdentificationNameTaskStep (a)-BMS 5-95, TYPE I, CLASS B SealantApply1 (a) Apply fillet seals common to the web, stiffeners, fittings, and upper and lower chords and apply cap seals to the rib post fastener heads wherever sealant was removed for access to inspection area. Refer to SOPM 20-50-19 as an accepted procedure. FIGURE 2: LEFT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - SEALANT APPLICATION (SHEET 4 OF 4) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 35 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 36 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT FSSI OUTBOARD UPPER LINK 713 SEAL RIB FITTINGS B D F FSSI UPPER 711 CHORD RIB POST MIDSPAR FSSI BACK-UP 684 FITTINGS INBOARD SEAL RIB RIB POST FSSI WEB 656 RIB POST FSSI 628 LOWER CHORD FIGURE 3: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 1 OF 8) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-57A2357 Work - See page 1 for details. 36 of 49 ### Page 37 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT UPPER CHORD FSSI FSSI FSSI FSSI PSSI FSSI FSSI 637 628 684 668 661 656 646 + UPPER LINK RIB POST FITTING RIB POST LOWER STIFFENER CHORD (6 LOCATIONS) INBD (LOOKING AFT) A-A 2501338 FIGURE 3: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 2 OF 8) Original Issue: September 12, 2016 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-57A2357 Work - See page 1 for details. 37 of 49 ### Page 38 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT FSSI RIB POST FSSI 713 684 RIB POST FSSI 711 + FITTING MID SPAR UPPER LINK BACK UP FITTINGS STIFFENER FITTINGS (LOOKING AFT) B-B INBD 2501339 FIGURE 3: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 3 OF 8) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-57A2357 Work - See page 1 for details. 38 of 49 ### Page 39 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT UPPER CHORD 12 LOCATIONS FSSI FSSI FSSI FSSI FSSI FSSI I FSSI FSSI 637 628 684 675 668 661 656 646 UPPER LINK RIB POST FITTING INBD RIB POST STIFFENER LOWER CHORD (6 LOCATIONS) (LOOKING AFT) C-C 1.00 STIFFENER LOWER TYPICAL CHORD INSPECTION AREA FIGURE 3: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 4 OF 8) Original Issue: September 12, 2016 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-57A2357 Work - See page 1 for details. 39 of 49 ### Page 40 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT FSSI RIB POST FSSI 713 684 7) RIB POST FSSI 711 UPPER LINK FITTINGS + + + + + + + 4 + + 6 LOCATIONS + + + + + + + INBD FITTING MID SPAR BACK UF -ITTINGS STIFFENER (LOOKING AFT) D-D 1.00 STIFFENER TYPICAL INSPECTION AREA LOWER CHORD 2501342 FIGURE 3: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 5 OF 8) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 40 of 49 ### Page 41 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT CHORD UPPER (6) 11 LOCATIONS FSSI FSSI FSSI FSSI FSSI FSSI FSSI 637 628 684 675 668 661 646 UPPER LOWER RIB POST LINK RIB POSTI CHORD STIFFENER FITTING (6 LOCATIONS) INBD 12 LOCATIONS (LOOKING AFT) E-E STIFFENER TYPICAL LOWER INSPECTION AREA CHORD C FIGURE 3: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 6 OF 8) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING 747-57A2357 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 41 of 49 ### Page 42 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT FSSI 713 FSSI FSSI 684 6 LOCATIONS 711 RIB POST RIB POST + + + + + + FITTING INBD 6 LOCATIONS ( 8 UPPER LINK FITTINGS MID SPAR BACK UP HITTINGS STIFFENER (LOOKING AFT) F-F STIFFENER TYPICAL INSPECTION AREA LOWER 2501346 CHORD FIGURE 3: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 7 OF 8) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-57A2357 Work - See page 1 for details. 42 of 49 ### Page 43 More DataQtyIdentificationNameTaskStep WARNING: DO NOT USE METAL TOOLS TO REMOVE SEALANT. IF A METAL TOOL IS USED TO RE- MOVE SEALANT, IT COULD SCRAPE OR GOUGE THE STRUCTURE UNDER THE SEALANT. A SCRAPE OR GOUGE IN THE STRUCTURE COULD LEAD TO A CRACK WHICH COULD CAUSE A FUEL LEAK WHICH COULD CAUSE A FIRE (a)--SealantRemove1 (b)--WebClean2 (c)--WebInspect3 (d)--WebInspect4 (e)--WebInspect5 (f)--WebInspect6 (g)--WebInspect7 (h)--WebInspect8 (a) Remove the fillet seals common to the web, stiffeners, fittings, and upper and lower chords and remove cap seals from the rib post fastener heads to get access to the inspection area. Refer to SOPM 20-50-19 as an accepted procedure (b) Clean the inspection area. Refer to SOPM 20-30-03 as an accepted procedure. (c) Do a detailed inspection for any crack in the front spar web. (d) Do a High Frequency Eddy Current (HFEC) surface inspection for any crack in the front spar web at the edges of the upper and lower chords in accordance with 747 NDT Manual Part 6, 51-00-00, Procedure 4 or 23. Do the inspection along the edge of the chords where the sealant was removed. (e) Do an Ultrasonic inspection for any crack in the front spar web under the upper and lower chords in ac- cordance with 747 NDT Manual Part 4, 57-10-25. Do the inspection along the edge of the chords where the sealant was removed. (f) Do an Ultrasonic inspection for any crack in the front spar web under the stiffeners and fittings in accordance with 747 NDT Manual Part 4, 57-10-25. (g) Do a HFEC surface inspection for any crack in the front spar web around the fastener heads in accordance with 747 NDT Manual Part 6, 51-00-00, Procedure 4 or 23 . Do the inspection around all fasteners between the upper and lower chords. (h) Do an Ultrasonic inspection for any crack in the front spar web under the upper link fittings and mid spar back up fittings in accordance with 747 NDT Manual Part 4, 57-10-09. FIGURE 3: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - INSPECTION (SHEET 8 OF 8) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 43 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 44 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT FSSI 713 OUTBOARD LINK UPPER SEAL RIB FITTINGS FSSI • 688 FSS UPPER 711 CHORD RIB POST MIDSPAR FSSI BACK-UP 684 FITTINGS INBOARD SEAL RIB RIB POST FSSI 656 WEB RIB POST FSSI 628 LOWER CHORD 2502798 FIGURE 4: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - SEALANT APPLICATION (SHEET 1 OF 4) Original Issue: September 12, 2016 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-57A2357 Work - See page 1 for details. 44 of 49 ### Page 45 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT UPPER CHORD FSSI FSSI FSSI FSSI FSSI PSSI FSSI FSSI 637 628 684 675 668 661 656 646 ++*+* ++i UPPER LINK RIB POST FITTING RIB POST LOWER STIFFENER CHORD (6 LOCATIONS) (LOOKING AFT) INBD A-A 2502799 FIGURE 4: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - SEALANT APPLICATION (SHEET 2 OF 4) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING 747-57A2357 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 45 of 49 ### Page 46 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT FSSI RIB POST FSSI 713 684 RIB POST FSSI 711 MID SPAR BACK UP FITTING FITTINGS STIFFENER FITTINGS (LOOKING AFT) B-B INBD 2502802 FIGURE 4: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - SEALANT APPLICATION (SHEET 3 OF 4) Original Issue: September 12, 2016 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-57 A2357 Work - See page 1 for details. 46 of 49 ### Page 47 More DataQtyIdentificationNameTaskStep (a)-BMS 5-95, TYPE I, CLASS B SealantApply1 (a) Apply fillet seals common to the web, stiffeners, fittings, and upper and lower chords and apply cap seals to the rib post fastener heads wherever sealant was removed for access to inspection area. Refer to SOPM 20-50-19 as an accepted procedure. FIGURE 4: RIGHT WING FRONT SPAR WEB - FSSI 628 STIFFENER TO FSSI 713 FITTING - SEALANT APPLICATION (SHEET 4 OF 4) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 47 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 48 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 FRONT SPAR WEB INSPECTIONSPART 2 NO CRACK FOUNDCONDITION 1 ANY CRACK FOUNDCONDITION 2 APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE: TABLE 1: FRONT SPAR WEB INSPECTION - LEFT & RIGHT SIDE - FSSI 628 STIFFENER TO FSSI 713 FITTING (SHEET 1 OF 2) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 12, 2016 747-57A2357 48 of 49 BOEING SERVICE BULLETIN 747-57A2357 ALERTALERT ### Page 49 (OCR) BOEING SERVICE BULLETIN 747-57A2357 ALERT ALERT WHICHEVER OCCURS LATER BEFORE 10,000 TOTAL FLIGHT WITHIN 6 MONTHS AFTER THE CYCLES OR 80,000 TOTAL ORIGINAL ISSUE DATE OF THIS FLIGHT HOURS, WHICHEVER SERVICE BULLETIN. OCCURS FIRST DO PART 2 CONDITION 2 CONDITION 1 BEFORE FURTHER FLIGHT NOT TO EXCEED 1,200 FLIGHT CYCLES ACTION 1: CONTACT BOEING FOR REPAIR INSTRUCTIONS AND DO THE REPAIR REPEAT PART 2 NOT TO EXCEED 1,200 FLIGHT CYCLES REPEAT PART 2: FRONT SPAR WEB INSPECTIONS FOR ANY CRACK AT THE UNREPAIRED AREAS APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE: TABLE 1: FRONT SPAR WEB INSPECTION - LEFT & RIGHT SIDE - FSSI 628 STIFFENER TO FSSI 713 FITTING (SHEET 2 OF 2) Original Issue: September 12, 2016 Export Controlled ECCN: 9E991 - BOEING 747-57A2357 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 49 of 49 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.