# Boeing Alert Service Bulletin 747-25A3581: U.S. DOT/FAA - Boeing Service Bulletin - Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2012-0862; AD 2014-05-31 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Boeing Alert Service Bulletin 747-25A3581](https://openairdocs.org/service-documents/boeing/747-25a3581.md) - Title as filed: U.S. DOT/FAA - Boeing Service Bulletin - Pages: 63 - PDF: https://openairdocs.org/files/sha256/d4/e2/d4e2841c96bb8fbabfcc20a490a23e9e6b7c57863acd6f01dc56592dcde1975d - Page: https://openairdocs.org/service-documents/boeing/747-25a3581/file/d4e2841c96bb ## 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: 747-25A3581 Original Issue: September 23, 2010 Revision 2: September 11, 2012 ATA System: 2500 SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile Drip Shield Change 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 © 2010 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 Unpublished Work.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, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, 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. BOEING is a trademark of Boeing Management Company. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 1 of 63 3.0 ### Page 2 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 2 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT BLANK PAGE ### Page 3 Table of Contents Revision Transmittal Sheet ............................................ 5 Summary ...................................................... 9 1. PLANNING INFORMATION ........................................ 1 3 A. Effectivity ............................................... 1 3 1. Airplanes ............................................ 1 3 2. Spares Affected ........................................ 1 4 B. Concurrent Requirements ...................................... 1 5 C. Reason ................................................ 1 5 D. Description .............................................. 1 5 E. Compliance .............................................. 1 6 F. Approval ............................................... 1 6 G. Manpower .............................................. 1 6 H. Weight and Balance Changes .................................... 1 7 I. Electrical Load Data ......................................... 1 7 J. References .............................................. 1 7 1. Existing Data: ......................................... 1 7 2. Data Supplied with this Service Bulletin: ........................... 1 8 3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 8 K. Publications Affected ........................................ 1 8 L. Interchangeability and Intermixability of Parts ........................... 1 8 M. Software Accomplishment Summary ................................ 1 8 2. MATERIAL INFORMATION ........................................ 1 9 A. Material - Price and Availability ................................... 1 9 B. Industry Support Information .................................... 1 9 C. Parts Necessary for Each Airplane ................................. 1 9 1. Kits/Parts ............................................ 1 9 2. Parts and Materials Supplied by the Operator ........................ 2 2 3. Parts Modified and Reidentified ................................ 2 3 4. Parts Removed and Not Replaced .............................. 2 3 D. Parts Necessary to Change Spares ................................. 2 3 E. Special Tooling - Price and Availability ............................... 2 3 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 3 3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 5 A. GENERAL INFORMATION ..................................... 2 5 B. WORK INSTRUCTIONS ....................................... 2 6 FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD .... 2 7 FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES .... 3 3 FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION .................................................. 3 7 FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING . . . 42 FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY ............................... 4 8 FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS .................................................. 5 7 FIGURE 7: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF NEW INSULATION BLANKET .................................................. 6 1 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 3 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 4 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 4 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT BLANK PAGE ### Page 5 Commercial Airplanes 747 Service Bulletin ALERT Revision Transmittal SheetNumber: 747-25A3581Original Issue: September 23, 2010 Revision 2: September 11, 2012 ATA System: 2500 SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile Drip Shield Change This revision includes all pages of the service bulletin. COMPLIANCE INFORMATION RELATED TO THIS REVISION More work is necessary on the airplane(s) changed in accordance with revision 1 of this service bulletin. Airplane RT061 was added to Group 2 of this service bulletin effectivity. REASON FOR REVISION This revision is sent to make changes to the service bulletin to address possible interference issues, which clarifies wire routing, allows for trimming of parts and adds parts to the top kit. Also to add 1 airplane to service bulletin effectivity. These sections were changed: 1. In Paragraph 1.A.1., Airplanes, added airplane RT061 to Group 2. 2. In Paragraph 1.C.1., Kits/Parts, changed table to add more parts and revised quantities. 3. In Paragraph 1.M., added Software Accomplishment Summary paragraph. 4. In Paragraph 2.B., Industry Support Information, updated warranty statement. 5. In Paragraph 3.A., General Information, added note 8. 6. In Work Instructions, changed as follows: a. Step 1, changed instructions to gain access. b. Removed Step 9, not necessary to remove/install floor panel. c. Re-numbered Step 10 to Step 9. 7. In Figure 2, changed as follows: a. On Sheet 1, removed wire bundle callouts and bubble callouts. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 5 of 63 ### Page 6 b. On Sheet 2, changed bubble callouts. c. In step table changed more data and removed foot notes. 8. In Figure 3, changed as follows: a. On Sheet 3, added new views D-D and E-E. b. In Step Table, changed fasteners for steps 3 and 4 to BACB30MY6K() and BACC30M6. 9. In Figure 4, changed as follows: a. Replaced sheet 1 and 2 illustrations. b. Added sheet 3 and 4 illustrations. c. Changed Step Table to match new illustrations. 10. In Figure 5, changed as follows: a. On Sheet 4, added notes to allow trimming of drip shield forward bracket and to say existing fastener pattern may be different. b. On Sheet 5, added note to allow trimming of drip shield aft bracket. c. In Step Table, Step 10, added more data. d. In Step Table, Step 11 and 15, added more data to allow for trimming of brackets. e. In Step Table, Step 14 and 17, added substep to apply adhesive. f. In Step Table, added foot notes (d), (e) and (f). 11. In Figure 6, changed as follows: a. In sheet 2 and 3 illustrations, removed bubbles 1 and 2. b. In sheets 2 and 3 illustrations, renumbered bubbles 3 through 6 to bubbles 1 through 4. c. In Step Table, removed Steps 1 and 2, bond requirements moved to Steps 14 and 17 of Figure 5. d. In Step Table, renumbered Steps 3 through 6 to Steps 1 through 4. e. In Step Table, added footnotes (e) and (f) to allow for trimming of shield deflectors. Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location of important changes. Pages with no vertical lines have no important changes. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 6 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 7 REVISION HISTORY September 23, 2010Original Issue: June 30, 2011Revision 1: September 11, 2012Revision 2: Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 7 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 8 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 8 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT BLANK PAGE ### Page 9 Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-25A3581Original Issue: September 23, 2010 Revision 2: September 11, 2012 ATA System: 2500 SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile Drip Shield Change THIS BULLETIN 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 SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER. CONCURRENT REQUIREMENTS Refer to Paragraph 1.B., Concurrent Requirements. BACKGROUND This service bulletin will mitigate water from exiting over the edge of the existing drip shield and contaminating electrical components in the M826 cardfile below. If this service bulletin is not incorporated, electrical components in the M826 cardfile can malfunction due to water contamination which could result in an electrical short and potential loss of several functions essential for safe flight. An Operator reported finding evidence of water damage to Diode Fire Card 285U0072-1 in the M826 Automatic Fire Overheat Logic Test System (AFOLTS) cardfile following a false FWD CARGO FIRE message which resulted in an Air Turn Back (ATB). Measurements showed the drip shield sloped away from the two drains added by SB 747-25A3370 (-400F) and SB 747-25A3526 (-400 Boeing Converted Freighter) and mandated by Airworthiness Directive (AD). Boeing's subsequent investigation found other reports of water damage to circuit cards in M826 affecting several operators. This service bulletin replaces the existing drip shield with a new drip shield, installs two new drip shield deflectors between the new drip shield and the two adjacent bulkheads, and relocates wire bundles that interfere with these installations. Boeing Service Related Problem (SRP) 747-SRP-25-0282 is related to this service bulletin. ACTION (PRR 85901-100RS) Do the following items: 1. Remove existing drip shield 2. Relocate wire bundle routing. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 9 of 63 ### Page 10 3. Install new drip shield's brackets 4. Install new drip shield 5. Install new drip shield deflectors 6. Install new insulation blankets EFFECTIVITY 747-400 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. Boeing recommends that the change given in this service bulletin be done within 24 months after the revision 2 issue date of this service bulletin. INDUSTRY SUPPORT INFORMATION Boeing warranty remedies may be available for airplanes in warranty as of October 8, 2008. Please refer to Paragraph 2.B., Industry Support Information. MANPOWER Elapsed HoursTotal Task HoursAirplanes 14.7522.50GROUP 1 14.7522.50GROUP 2 MATERIAL INFORMATION Boeing Supplied Kits/Parts. 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 23, 2010 747-25A3581Revision 2: September 11, 2012 10 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 11 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT -REMOVE EXISTING DRIP SHIELD -REMOVE EXISTING BLANKET -REMOVE EXISTING BRACKETS -RELOCATE EXISTING WIRE BUNDLES -INSTALL NEW BRACKETS -INSTALL NEW DRIP SHIELD -INSTALL NEW DRIP SHIELD DEFLECTORS -INSTALL NEW BLANKET STA 400 STA 380 STA STA 340 1964805 Original Issue: September 23, 2010 Revision 2: September 11, 2012 Export Controlled ECCN: 9E991 - BOEING 747-25A3581 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details 11 of 63 ### Page 12 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 12 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT BLANK PAGE ### Page 13 Commercial Airplanes 747 Service Bulletin ALERT Number: 747-25A3581 Original Issue: September 23, 2010 Revision 2: September 11, 2012 ATA System: 2500 SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile Drip Shield Change THIS BULLETIN 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 SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER. 1. PLANNING INFORMATION A. Effectivity 1. Airplanes Refer to Service Bulletin Index D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data. This service bulletin is for the airplanes shown below. An equivalent change is on subsequent production airplanes. Refer to PRR 85901-100RS for data about this change. DESCRIPTIONCONFIGURATIONGROUP 747-400 that did not get hardware equivalent to SB 747-25A3526 during conversion to BCF configuration. -1 747-400 that did get hardware equivalent to SB 747-25A3526 during conversion to BCF configuration. -2 Airplane Models: 747-400 GroupVariable Number 2RM128 2RT021 - RT022 2RT031 - RT033 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 13 of 63 ### Page 14 GroupVariable Number 2RT061 1RT071 - RT072 1RT075 2RT161 2RT164 1RT456 2RT461 1RT501 2RT506 1RT507 - RT510 1RT513 1RT516 1RT518 2RT519 1RT520 1RT524 2RT526 1RT528 2RT530 1RT572 - RT574 2RT575 - RT579 2RT642 1RT655 - RT657 1RT751 2RT752 1RT781 - RT782 2RT837 2RT967 2. Spares Affected Examine your spares supply for the parts or components identified in Paragraph 2.C., Parts Necessary for Each Airplane. If any parts or components are found, refer to Paragraph 2.C. for the recommended use. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 14 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 15 B. Concurrent Requirements The service bulletin(s) listed below must be done before or at the same time as this service bulletin: Group 1: DescriptionService BulletinCompany (a) (b) Drip shield Modification747-25A3526, Revision 1Boeing (a) Steps 1-5 of Figure 2 in service bulletin 747-25A3526 R1 are NOT required if work is being accomplished concurrent with this service bulletin. (b) The portion of "More Data" in step 8 of Figure 3 in service bulletin 747-25A3526 R1 which says "Attach drain tube and strap above bead on the spud" is also NOT required. Group 2: None C. Reason This service bulletin will mitigate water from exiting over the edge of the existing drip shield and contaminating electrical components in the M826 cardfile below. If this service bulletin is not incorporated, electrical components in the M826 cardfile can malfunction due to water contamination which could result in an electrical short and potential loss of several functions essential for safe flight. An Operator reported finding evidence of water damage to Diode Fire Card 285U0072-1 in the M826 Automatic Fire Overheat Logic Test System (AFOLTS) cardfile following a false FWD CARGO FIRE message which resulted in an Air Turn Back (ATB). Measurements showed the drip shield sloped away from the two drains added by SB 747-25A3370 (-400F) and SB 747-25A3526 (-400 Boeing Converted Freighter) and mandated by Airworthiness Directive (AD). Boeing's subsequent investigation found other reports of water damage to circuit cards in M826 affecting several operators. This service bulletin replaces the existing drip shield with a new drip shield, installs two new drip shield deflectors between the new drip shield and the two adjacent bulkheads, and relocates wire bundles that interfere with these installations. Boeing Service Related Problem (SRP) 747-SRP-25-0282 is related to this service bulletin. Revision 1 was send to make changes to the service bulletin to correct an interference issue found during parts mock-up for the 747-8. Revision 2 is sent to make changes to the service bulletin to address possible interference issues, which clarifies wire routing, allows for trimming of parts and adds parts to the top kit. Also to add 1 airplane to service bulletin effectivity. D. Description Do the following items: 1. Remove existing drip shield 2. Relocate wire bundle routing. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 15 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 16 3. Install new drip shield's brackets 4. Install new drip shield 5. Install new drip shield deflectors 6. Install new insulation blankets Revision 2 - More work is necessary on the airplane(s) changed in accordance with revision 1 of this service bulletin. The work in this service bulletin is done in the maintenance zone(s) given below. Affected Maintenance Zones ZoneModel 115747-400 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. Boeing recommends that the change given in this service bulletin be done within 24 months after the revision 2 issue date of this service bulletin. 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 The table below shows an estimate of the task hours necessary to do this change 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 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 16 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 17  Time to find the tools. Elapsed HoursTask HoursNumber of PersonsTask 0.250.251Open Access 2.752.751Figure 1 2.254.502Figure 2 1.501.501Figure 3 3.256.502Figure 4 2.254.502Figure 5 1.251.251Figure 6 1.001.001Figure 7 0.250.251Test 14.7522.50TOTAL FOR EACH AIRPLANE H. Weight and Balance Changes Change in Moment (Pound-Inches) Change in Weight (Pounds)Airplane +2717.0+7.3Group 1 +2717.0+7.3Group 2 I. Electrical Load Data Not changed. J. References 1. Existing Data: a. Engineering Change Memo PRR 85901-100RS b. Boeing Service Bulletin 747-25A3526 c. Boeing Service Related Problem (SRP) 747-SRP-25-0282 d. Service Bulletin Index D6-30300 e. Standard Overhaul Practices Manual (SOPM) 20-15-19, 20-43-03, 20-50-12 f. Standard Wiring Practices Manual (SWPM) 20-10-11, 20-10-12, 20-10-19 g. 747-400 Aircraft Maintenance Manual (AMM) 25-52-04, 53-21-02 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 17 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 18 h. 747-400SF Structural Repair Manual (SRM) 51-20-01, Chapter 51 2. Data Supplied with this Service Bulletin: None. 3. Installation Drawings Used in the Preparation of this Service Bulletin: TitleDrawing Number BLANKET ASSEMBLY INSULATION411U4403 DRIP SHIELD INSTL - CARD FILE - NOSE WHEEL WELL LH SIDE 828B4134 WIRE BUNDLE INSTALLATION - NOSE SECTION 41828B8101 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: Chapter-SectionPublication 53-11747 Illustrated Parts Catalog 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 Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability information. M. Software Accomplishment Summary Not affected. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 18 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 19 2. MATERIAL INFORMATION A. Material - Price and Availability Boeing can supply the kits shown in Paragraph 2.C., Parts Necessary for Each Airplane , as shown below. If there is a limit to the quantity of available , a supply sequence is given by Spares. More become available as shown in the Reorder Lead Time (ROLT). ROLT is calculated from the date Boeing gets the purchase order. REFER TO THE BOEING PART PAGE ON MYBOEINGFLEET.COM OR CONTACT FIRST RESPONDER AT FR@BOEING.COM FOR THE LATEST REORDER LEAD TIME (ROLT) AND PRICE INFORMATION Unit Price thru 04/30/2012 ROLT (Calendar Days) QTYDateNameKit Number $8,844.0029318/2/2011TOP KIT - AFOLTS DRIP SHIELD MODIFI- CATION 015U1884-1 The Kits are subject to the terms and conditions of the Boeing standard purchase order acknowledgment. After the Unit Price date, new price data is applicable. Prices are in United States dollars. Terms: Net 30 days. Reference this service bulletin and submit your purchase order by one of the methods that follow: 1. Order on-line via ATA Spec 2000 or Boeing Part Page 2. Fax to (206) 662-7145 3. Mail to: Spares Customer Support - MC 36-65 Boeing Spares Department P.O. Box 3707 Seattle, Washington 98124-2207 USA B. Industry Support Information Boeing warranty remedies are available for 747 airplanes in warranty as of October 8, 2008 . For task hour reimbursement for airplanes in warranty as of that date, send a warranty claim to Boeing Commercial Airplanes Group - Warranties. The kit for airplanes in warranty as of that date will be supplied at no charge. Send a purchase order for the kit to Boeing Spares. Please refer to this service bulletin number and reference the airplane variable number in your purchase order. C. Parts Necessary for Each Airplane 1. Kits/Parts To get the kits/parts shown below, 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 23, 2010 747-25A3581Revision 2: September 11, 2012 19 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 20 NOTE: One top kit and the items shown in Paragraph 2.C.2., Parts and Materials Supplied by the Operator, are necessary for each airplane. Kit 015U1884 NotesExisting Part Number NameQTYNew Part Number -1 TOP KIT - AFOLTS DRIP SHIELD RE- PLACEMENT -015U1884-1 BRACKET ASSY1287U0072-53 INSULATION BLANKET ASSEM- BLY 1411U4403-1001 DRIP SHIELD - FWD BRACKET 1672U7102-1 DRIP SHIELD - AFT BRACKET 1672U7102-2 DRIP SHIELD - DEFLECTOR 1672U7102-6 WIRE BRACKET ASSY 2672U7102-8 DRIP SHIELD - STA 360 BRACK- ET ASSY 1672U7102-9 DRIP SHIELD - STA 380 BRACK- ET ASSY 1672U7102-10 DRIP SHIELD - ASSY 1672U7102-11 DRIP SHIELD - DEFLECTOR PLATE 4672U7102-12 DRIP SHIELD - DEFLECTOR PLATE 1672U7102-13 DRIP SHIELD - DEFLECTOR 1672U7102-14 Rod, filler169B47961-5 HI-LOK PROT HEAD 2BACB30MY6K7 HI-LOK PROT HEAD 2BACB30MY6K8 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 20 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 21 Kit 015U1884 NotesExisting Part Number NameQTYNew Part Number -1 (a)BOLT, PROTRUD- ING HD 2BACB30VN6K7 (a)BOLT, PROTRUD- ING HD 2BACB30VN6K8 (a)BOLT, PROTRUD- ING HEAD 15BACB30VT6K3 (a)BOLT8BACB30VT6K4 HI-LOK1BACB30VT6K7 HI-LOK5BACB30VT8K6 BOLT3BACB30VT8K7 BOLT SHEAR LIGHT 2BACB30VT8K8 CLAMP, LOOP1BACC10DK12 (a)COLLAR4BACC30BK6 (a)COLLAR24BACC30BL6 COLLAR10BACC30BL8 COLLAR4BACC30M6 NUT, SPACER PLATE 1BACN10GH3A10 NUT2BACN10YR3CD (a)RIVET9BACR15BA4AD6C (a)RIVET, 100 DEG6BACR15BA5AD4C (a)RIVET, 100 DEG6BACR15BA5AD5C RIVET, UNIVER- SAL HEAD 2BACR15BB4D5C (a)RIVET22BACR15BB5AD6C RIVET2BACR15BB5D5C SCREW5BACS12GU3K30 (a)BOLT8BACS12HN3-9 (a)BOLT5BACS12HN3-10 (a)BOLT3BACS12HN3-11 BOLT1BACS12HN3-12 BOLT1BACS12HN3-20 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 21 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 22 Kit 015U1884 NotesExisting Part Number NameQTYNew Part Number -1 (a)RINGPOST, WIRE HARNESS MOUNTING SUP- PORT 16BACS31H1B (a)RINGPOST, WIRE HARNESS MOUNTING SUP- PORT 30BACS31H2B STRAP2BACS38K1 STRAP1BACS38K3 (a)TIE STRAP100BACS38W1 (a)WASHER6NAS1149D0332J (a)WASHER, FLAT16NAS1149D0363J SPACERS FOR BOLTS 1NAS43DD3-18FC SPACERS FOR BOLTS 1NAS43DD3-48FC SPACERS FOR BOLTS 1NAS43DD3-50FC (a)SPACER, SLEEVE3NAS43DD6-9FC (a) There are more parts than are necessary. (b) If grip length shown is not available at Boeing, fasteners supplied in kits may be one grip length longer than indicated. Also, if any fasteners part numbers listed are not available or have been superseded, substitute fasteners may be supplied in kits. 2. Parts and Materials Supplied by the Operator NotesNameQTYPart Number / Specification (a)SEALANT12 OZBMS 5-95 (a)ADHESIVE12 OZBMS 5-92 (a)CORROSION INHIBITING COM- POUND 8 OZBMS 3-27 (a)ALODINE SOLUTION8 OZALODINE 1200 or 1200S (a) See the Qualified Products List at the end of the Boeing Material Specification (BMS) for supplier data. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 22 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 23 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 23, 2010 747-25A3581Revision 2: September 11, 2012 23 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 24 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 24 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT BLANK PAGE ### Page 25 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 are given in 747 SRM 51 – Torque limits to tighten nuts and bolts are given in 747 SRM 51 4. Use the approved fastener and process material substitutions in accordance with 747 SRM 51. 5. Refer to the SWPM 20-10-11 and SWPM 20-10-12 for the wire installation procedures, and SWPM 20-10-19 for the wire separation requirements, as accepted procedures. 6. If the length of any fastener specified in this service bulletin does not meet the installation standards in 747-400SF SRM 51, then a fastener of the same specification, or an approved substitute, with a length which meets the installation standards in 747-400SF SRM 51 may be used. 7. 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. 8. Loosen additional clamps and hardware as required to allow moment of wire bundles to new ring post locations. Tighten any clamps and hardware that were loosened to facilitate movement of wire bundles. Refer to the SWPM 20-10-11, SWPM 20-10-12 , and SWPM 20-10-19, as accepted procedures. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 25 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 26 B. WORK INSTRUCTIONS 1. Gain access to left forward Main Equipment Compartment (MEC). Refer to 747-400 AMM 53-21-02 as an accepted procedure. 2. Remove existing drip shield in accordance with Figure 1. 3. Loosen wire bundles routing in accordance with Figure 2. 4. Install provisions for wire bundle routing in accordance with Figure 3. 5. Relocate wire bundle routing in accordance with Figure 4. 6. Install new drip shield brackets and new drip shield in accordance with Figure 5. 7. Install drip shield deflectors in accordance with Figure 6. 8. Install new insulation blanket in accordance with Figure 7. 9. Put the airplane back to a serviceable condition. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 26 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 27 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT STA TYPICAL 400 STA 400 BULKHEAD STA 340 STA 340 TYPICAL 1959064 FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD (SHEET 1 OF 6) Original Issue: September 23, 2010 Revision 2 September 11, 2012 PROPRIETARY - Copyright ® Unpublished Export Controlled ECCN: 9E991 - BOEING 747-25A3581 Work - See page 1 for details. 27 of 63 ### Page 28 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT _WL 186 STA 340 STA FWD 360 STA A-A 400 FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD (SHEET 2 OF 6) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 28 of 63 ### Page 29 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT C — STRAP CLAMP WASHER SCREW STANDOFF INBD STA 340 BULKHEAD LBL (VIEW LOOKING FORWARD) 20 B-B LBL 25.60 INBD C-C 1963098 FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD (SHEET 3 OF 6) Original Issue: September 23, 2010 Revision 2 September 11, 2012 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-25A3581 Work - See page 1 for details. 29 of 63 ### Page 30 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT 8) BRACKET BRACKET 8 STA STA 340 380 FWD BULKHEAD STA 400 • TYPICAL E-E BULKHEAD D-D STA 400 STA 360 STA 340 BRACKET 9 5) 10 LOCATIONS F-F C 1963095 FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD (SHEET 4 OF 6) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 30 of 63 ### Page 31 The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure. More DataQtyIdentificationNameTaskStep near STA 340 and STA 400 2BACS38K1STRAPRemove1 1-DRAINAGE TUBE CLAMP Remove2 STA 340, LBL 25.60, WL 180 2-FASTENERRemove From horizontal stiff- ener (STA 340, LBL 25.60, WL 180) 1-SUPPORTING STANDOFF Remove (a) Fill holes in hori- zontal stiffener (STA 340, LBL 25.60, WL 180) 2BACR15BA4AD6CRIVET, 100 DEGInstall (New) (b) Typical:--DRAINAGE TUBE CLAMP Loosen3 1 STA 340 and 3 STA 400 near STA 340 and STA 400 2-DRAINAGE TUBEDisconnect4 6 (STA 340) and 4 (STA 400) 10-FASTENERRemove5 at STA 3603-SCREWRemove6 at STA 3803-SCREWRemove 284U1364-1, or -2, or -3. 1-DRIP SHIELDRemove7 3 (STA 340 bulk- head) and 1 (STA 400 bulkhead) 4284U1363-1BRACKET - DRIP SHIELD MOUNTING Remove8 6 (STA 340 bulk- head) and 2 (STA 400 bulkhead) 8-FASTENERRemove (a) Fill holes 6 (STA 340) and 2 (STA 400). Flush is not re- quired. 8BACR15BA5AD4CRIVET, 100 DEGInstall (New) FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD (SHEET 5 OF 6) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 31 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 32 More DataQtyIdentificationNameTaskStep STA 400 bulkhead1284U1363-4BRACKET - DRIP SHIELD MOUNTING Remove9 STA 400 bulkhead2-FASTENERRemove (a) Fill holes 2 (STA 400 bulkhead). Flush is not re- quired. 2BACR15BA5AD4CRIVET, 100 DEGInstall (New) At STA 360, (a) (c)3-NUTPLATERemove10 At STA 380, (a) (c)3-NUTPLATERemove (a) Apply Alodine 1200 conversion coating and corrosion inhibiting compound (BMS3-27). Refer to SOPM 20-43-03 and 747-400SF SRM Chapter 51 as accepted procedures. (b) Loosen the drain tube clamp(s) from the supporting standoff as needed. (c) Fill #40 rivet holes with AD material after removing nut plates. FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD (SHEET 6 OF 6) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 32 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 33 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT STA 400 STA 380 STA 360 1962728 FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES (SHEET 1 OF 4) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-25A3581 Work - See page 1 for details. 33 of 63 ### Page 34 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT STA 400 STA 380 LBL 40 LBL STA 400 BULKHEAD WIRE BUNDLES NOT SHOWN FOR CLARITY 1961527 FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES (SHEET 2 OF 4) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-25A3581 Work - See page 1 for details. 34 of 63 ### Page 35 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT STA 400 BULKHEAD LBL 30 WIRE BUNDLES NOT SHOWN FOR CLARITY LBL 40 1961528 FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES (SHEET 3 OF 4) Original Issue: September 23, 2010 Revision 2 September 11, 2012 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-25A3581 Work - See page 1 for details. 35 of 63 ### Page 36 The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure. More DataQtyIdentificationNameTaskStep FORWARD SIDE OF STA 400 BULK- HEAD --WIRE BUNDLESLoosen1 REMOVE CLAMPS AND ASSOCIATED HARDWARE AT LOCATION AS SHOWN. -BACC10DK12CLAMP, LOOPRemove2 -BACC10DK12CLAMP, LOOPRemove / Keep3 FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES (SHEET 4 OF 4) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 36 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 37 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT STA 400 STA 380 STA 360 1962729 FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION (SHEET 1 OF 5) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-25A3581 Work - See page 1 for details. 37 0f 63 ### Page 38 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT STA 400 BULKHEAD LBL 30 WIRE BUNDLES NOT SHOWN FOR CLARITY LBL BEFORE 40 C AFTER 1962731 FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION (SHEET 2 OF 5) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-25A3581 Work - See page 1 for details. 38 of 63 ### Page 39 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT LBL STA 40 400 LBL 50 FWD D-D LBL 40 LBL 50 BEFORE STA 400 m 0.50 WL 7.50 172.69 7.50 FWD AFTER • WL 172.93 1962732 E-E FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION (SHEET 3 OF 5) Original Issue: September 23, 2010 Revision 2 September 11, 2012 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-25A3581 Work - See page 1 for details. 39 of 63 ### Page 40 The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure. More DataQtyIdentificationNameTaskStep LBL 38, STA 4001287U0073-57BRACKET ASSYRemove1 2-FASTENERRemove UPPER NUT SPAC- ER ASSY 1287U0072-53NUT SPACER ASSYRemove2 LBL 38, STA 4002-FASTENERRemove (a) (b) PLUG OPEN HOLES 2BACB30MY6K7BOLT, PROTRUDING HD Install (New)3 2BACB30M6COLLARInstall (New) (a) Pick up existing Fasteners 2-HOLEDrill4 LBL 38, STA 4001287U0072-53NUT SPACER ASSYInstall (New) 2BACB30MY6K8BOLT, PROTRUDING HD Install (New) 2BACB30M6COLLARInstall (New) LBL 38, STA 4001672U7102-8WIRE BRACKET ASSYInstall (New)5 (c)2BACS12HN3-10BOLTInstall (New) 2NAS1149D0332JWASHERInstall (New) STA 400, LBL 501287U0073-55BRACKETRemove6 2-FASTENERRemove UPPER NUT SPAC- ER 1-NUT, SPACER PLATERemove7 STA 400, LBL 50, WL 186 2-FASTENERRemove (a) (b) PLUG OPEN HOLES 2BACR15BB5D5CRIVETInstall (New)8 (a)2DIA. 0.128 - 0.135HOLEDrill9 LBL 50, STA 4001BACN10GH3A10NUT, SPACER PLATEInstall (New) 2BACR15BB4D5CRIVET, UNIVERSAL HEAD Install (New) LBL 50, STA 4001672U7102-8WIRE BRACKET ASSYInstall (New)10 2BACS12HN3-10BOLTInstall (New) 2NAS1149D0332JWASHERInstall (New) FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION (SHEET 4 OF 5) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 40 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 41 More DataQtyIdentificationNameTaskStep (a) Apply Alodine 1200 conversion coating and corrosion inhibiting compound (BMS3-27). Refer to SOPM 20-43-03 as an accepted procedure. (b) Refer to 747-400SF SRM Chapter 51 as an accepted procedure. (c) Locate and install new nutplate BACN10GH3A10 and (2) BACR15BB4D rivets as required. FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION (SHEET 5 OF 5) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 41 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 42 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT STA BL 400 B LBL 10 LBL 20 B405 STA 380 B119 LBL 40 ILBL STA 50 360 DRIP SHIELD 1962734 FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING (SHEET 1 OF 6) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-25A3581 Work - See page 1 for details. 42 of 63 ### Page 43 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT DRIP SHIELD AC DUCT STA BL 400~ LBL 10 LBL 20 STA 380 B405 LBL B119 50 STA 360 LBL 70 LBL 80 180 W4762 W4756 W4753 1962735 FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING (SHEET 2 OF 6) Original Issue: September 23, 2010 Revision 2 September 11, 2012 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING Work - See page 1 for details. 747-25A3581 43 of 63 ### Page 44 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT LBL LBL 40.0 50.0 1A 4A 2A 5А у 3 ЗА 6A 7A 8A 9A G F ORSTU ORSTU SEE TABLE E AND F SEE TABLE E AND G FOR AFFECTED WIRE BUNDLES FOR AFFECTED WIRE BUNDLES LBL W4756 51.01 W4753 DRAIN W4511(2) TUBE W1341 W4762 W8610 2 W8611 W5030 FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING (SHEET 3 OF 6) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING 747-25A3581 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 44 of 63 ### Page 45 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT NOTE: Maximum wire configuration is shown, some wire bundle(s) may not exists on your airplane configuration. WIRE BUNDLE / RING POST POSITION TABLE TABLE E B D H J K W8610 W5030 W1341 FOR W4415 W1329 W1333 W4437A W4754 W4433A W4433 W8611 LBL 40.0 W4417 W4444A W4756 W4675A W4435 SEE W4441 W4705A W4756A W4437 TABLE F W4489 W4751A W4443 W4555 W4753A W4588 FOR W4591 W4763A W4683 LBL 50.0 W4758 W4764A W4705 SEE W4762 W4765A W4750 TABLE W5273 W4764 G W4404 W4770 W4431 W4975 W4751 TABLE E (continued) L N P Q R S W4417A W5172A W4750B W4425 W44B2 W4445B W4427B W4417B W4434 W44A1 W4425A W4441A W4754B W4427 W44B6 W4756B W4751B W4425B W4444 W44A3 W4591A W4435A W4415B W4432 W5273B W4753B W4591B W4445 W4579 W4706A W4555A W5172B W4442 W4758B W4974B W4447 W4758A W4750A W4435B W4563 W4975B W4675 W4754A W4706 W4752 W4762A W4763 W4765 W4907 W4772 W4974 W5166 W5172 W4511 W4402 W4753 W4760 TABLE F 1A 2A ЗА D W1231 W1235 W1765 W4753 W4756 TABLE G 4A 5A 6A 7A 8A 9A W1771 W919 W1237 W1313 W1233 W1311 W4753 W4756 W5172 FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING (SHEET 4 OF 6) Original Issue: September 23, 2010 Revision 2 September 11, 2012 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-25A3581 Work - See page 1 for details. 45 of 63 ### Page 46 The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure. NOTE: Maximum wire configuration is shown, some wire bundle(s) may not exists on your airplane configuration. More DataQtyIdentificationNameTaskStep (a) (d) Install on 672U7102-8 Wire Bracket Assemblies. 30BACS31H2BRING POST, WIRE MOUNTING SUPPORT Install (New)1 (d) Install on 672U7102-8 Wire Bracket Assemblies. and BACS38W1 Straps as needed to allow re-routing. 16BACS31H1BRINGPOST, WIRE HARNESS MOUNTING SUPPORT Install (New) (b) Move existing Wire Bundles from the current location at STA 400, LBL38.00 through LBL 50.00, at WL 189.8 to new ring post locations in ac- cordance with Ta- bles E, F, and G. --WIRE BUNDLESRoute2 (e) Install as re- quired o hold wire bundles to the ring posts. -BACS38W1TIE STRAPInstall (New)3 (b) Remove existing ECS Strap and re- tain same mounting block hardware. Ad- just location to allow routing of W5172. 1-WIRE BUNDLERoute4 1BACC10DK12CLAMP, LOOPInstall (Kept) Install at new clamp- ing point approxi- mate STA. 400, WL 179.3. -BACS38K3STRAPInstall (New) FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING (SHEET 5 OF 6) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 46 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 47 More DataQtyIdentificationNameTaskStep (b) (c) W4753, W4756, W4762 at- tach to an existing standoff that carries a drainage line at LBL 51 and WL 183 3-WIRE BUNDLESRoute5 Support is no longer required from the clamp located at WL 189, LBL 50. 1BACC10DK12CLAMP, LOOPRoute 1NAS43DD3-48FCSPACERS FOR BOLTS Install (New) To maintain separa- tion of Coax wire bundles -69B47961-5GROMMETInstall (New) 1NAS1149D0332JWASHERInstall (New) 1BACS12GU3K30SCREW, CAPInstall (New) (b) For existing wire bundles not shown, clamp at their origi- nal points at LBL 38 and LBL 50 using the new post rings on 672U7102-8 brackets. Refer to the wire bundle / ring post position table for ring post location. --WIRE BUNDLESRoute6 (a) Add and install ringposts as required to support wiring in the airplane, variance of the ring post locations is acceptable to allow rerouting attachment in a more confined space. (b) Maintain original wire separations as required. Refer to SWPM 20-10-19 as an accepted procedure. (c) Use filler rod and adjustable straps where required. (d) There are more post rings than are necessary. Use as required. (e) There are more straps than are necessary. Use as required. Leave straps loose so that they can be ad- justed, tighten straps after all wire bundles are routed correctly in the final desired position. FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING (SHEET 6 OF 6) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 47 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 48 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT STA 400 STA 380 E STA 360 STA AI 340 1962738 FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY (SHEET 1 OF 9) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. ### Page 49 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT 6 LOCATIONS 3 1.00 1.00→ 23.50 STA 12.91 360 4.06 0.57 TYPICAL 5 LOCATIONS (5 1.00 EXISTING 23.50 FASTENER LOCATIONS STA 380 9.54 4.06 1.03 TYPICAL 1962741 FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY (SHEET 2 OF 9) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING 747-25A3581 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 49 of 63 ### Page 50 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT LOWER CHORD NUT LOWER CHORD 8) NUT WASHERS SPACER 9 STA 8) SPACER 340 DRIPSHIELD (€ DRIPSHIELD (6 A-A 9) BOLT STA 360 8) WASHERS ® BOLT B-B STA 380 WD BULKHEAD STA 400 1962746 FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY (SHEET 3 OF 9) Original Issue: September 23, 2010 Revision 2 September 11, 2012 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 747-25A3581 Work - See page 1 for details. 50 of 63 ### Page 51 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT • TOP OF MAIN DECK FLOOR BEAM EXISTING FASTENERS TO REMAIN EXISTING FASTENER PATTERN AND QUANTITY SHOWN MAY BE DIFFERENT FROM YOUR • 16.44. AIRPLANE CONFIGURATION 1,20- TRIM BRACKET AS REQUIRED TO AVOID INTERFERENCE WITH PIPE INSTALLATION EXISTING EXISTING FASTENERS FASTENERS TO REMAIN TO REMAIN 0.19 FWD ONE VIS EXISTING 1962744 FASTENERS TO REMAIN FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY (SHEET 4 OF 9) Original Issue: September 23, 2010 Revision 2 September 11, 2012 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING Work - See page 1 for details. 2910 19 ### Page 52 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT TOP OF MAIN DECK TRIM BRACKET AS FLOOR BEAM REQUIRED TO AVOID INTERFERENCE WITH BULKHEAD STIFFENER 8 LOCATIONS 10 17) 16.44 TYPICAL / 16.89 .58 STA 400 1962745 BULKHEAD 0.37 TYPICAL FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY (SHEET 5 OF 9) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-25A3581 Work - See page 1 for details. 52 of 63 ### Page 53 The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure. More DataQtyIdentificationNameTaskStep (a) (b) Fill holes in lower chord. 1 hole STA 360 and 3 holes in STA 380. TYPICAL, CONFIG- URATION MAY VARY 4BACR15BA4AD6CRIVET, 100 DEGInstall (New)1 Position bracket at installation indicated by figure at STA 360 1672U7102-9DRIP SHIELD - STA 360 BRACKET ASSY Locate2 (a) (b)6DIA. 0.187 - 0.190HOLEDrill3 5 EXISTING HOLES + 1 NEW HOLES (TYPICAL) (a) INSTALL BRACKET TO LOWER CHORD STA 360 6BACB30VT6K3BOLT, PROTRUDING HEAD Install (New) (a)6BACC30BL6COLLARInstall (New) Position bracket at installation indicated by figure at STA 380 1672U7102-10DRIP SHIELD - STA 380 BRACKET ASSY Locate4 (a) (b)5DIA. 0.187 - 0.190HOLEDrill5 3 EXISTING HOLES + 2 NEW HOLES (TYPICAL) (a) INSTALL BRACKET TO LOWER CHORD STA 380 5BACB30VT6K3BOLT, PROTRUDING HEAD Install (New) (a)5BACC30BL6COLLARInstall (New) Position dripshield at installation indicated by figure 1672U7102-11DRIP SHIELD - ASSYInstall (New)6 FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY (SHEET 6 OF 9) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 53 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 54 More DataQtyIdentificationNameTaskStep Backdrill through drip shield in loca- tion of nutplates on 672U7102-9 and 672U7102-10. 7BACS12HN3-9BOLTInstall (New)7 (a) 4 at STA 360 and 3 at STA 380 7NAS1149D0363JWASHER, FLATInstall (New) Install bolts wet with BMS 5-95 sealant. -BMS 5-95SEALANTApply (a) (b) Backdrill through drip shield in location of nut- plate on lower chord STA 380 1BACS12HN3-20BOLTInstall (New)8 Washer goes to each side of the drip shield 1NAS1149D0363JWASHER, FLATInstall (New) Washer goes to each side of the drip shield 1NAS1149D0363JWASHER, FLATInstall (New) (a)1NAS43DD3-50FCSPACERS FOR BOLTS Install (New) (a)1BACN10YR3CDNUTInstall (New) (a) (b) Backdrill through drip shield in location of nut- plate on lower chord STA 360 1BACS12HN3-12BOLTInstall (New)9 Washer goes to each side of the drip shield 1NAS1149D0363JWASHER, FLATInstall (New) Washer goes to each side of the drip shield. 1NAS1149D0363JWASHER, FLATInstall (New) (a)1NAS43DD3-18FCSPACERS FOR BOLTS Install (Changed) (a)1BACN10YR3CDNUTInstall (Changed) FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY (SHEET 7 OF 9) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 54 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 55 More DataQtyIdentificationNameTaskStep (a) (b) (d) Make sure the collars are on the forward side of the STA 340 bulk- head. --FASTENERInspect10 Trim 672U7102-1 bracket as required to avoid interference at pipe installation at bulkhead feed thru. Trim and finish in accordance with 747-400SF SRM 51- 20-01 and refer to SOPM 20-43-03 as an accepted proce- dure. 1672U7102-1DRIP SHIELD - FWD BRACKET Locate11 (a) (b) Pick 6 exist- ing rivet locations to match holes drill in the drip shield for- ward bracket. (STA 340 Bulkhead) 6-HOLEDrill (a)2BACB30VT8K8BOLT SHEAR LIGHTInstall (New)12 STA 340 (a)2BACC30BL8COLLARInstall (New) (a)1BACB30VT6K7HI - LOKInstall (New)13 STA 340 (a)1BACC30BL6COLLARInstall (New) (e) (f)-BMS 5-92ADHESIVEApply14 (a)3BACB30VT8K7BOLTInstall (New) (a)3BACC30BL6COLLARInstall (New) FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY (SHEET 8 OF 9) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 55 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 56 More DataQtyIdentificationNameTaskStep Trim 672U7102-2 bracket as required to avoid interference with bulkhead stiffen- er. Trim and finish in accordance with 747-400SF SRM 51- 20-01 and refer to SOPM 20-43-03 as an accepted proce- dure. 1672U7102-2DRIP SHIELD - AFT BRACKET Locate15 (a) (b) 8 New holes (STA 400) 8DIA. 0.191 - 0.202HOLEDrill16 (e) (f)-BMS 5-92ADHESIVEApply17 (a) INSTALL DRIP SHIELD AFT BRACKET TO STA 400 BULKHEAD 8BACB30VT6K4BOLTInstall (New) (a)8BACC30BL6COLLARInstall (New) (c)2-DRAINAGE TUBEConnect18 (c)2BACS38K1STRAPInstall (New) (a) Apply Alodine 1200 conversion coating and corrosion inhibiting compound (BMS3-27). Refer to SOPM 20-43-03 and 747-400SF SRM Chapter 51 as accepted procedures. (b) Dimensions are typical. Pick up existing fastener holes where possible. Variance of fastener locations is always acceptable when picking up existing holes. Pick up and fill fastener holes as required. Unless otherwise specified, all plug rivets (new and existing) must be flush with surface as to not interfere with Drip Shield installation. (c) Attach drain tube and strap above the bead on the spud. Trim to fit drain lines as required. Tighten all the screw(s) along the drain lines if it was loosen. If there are no drainage tubes, the AFT and FWD DRAINAGE TUBES may be installed in accordance with service bulletin 747-25A3526. (d) If the collars are on the forward side of STA 340 bulkhead, remove those fasteners. Install new BACB30VT8*6 and BACC30BL8 with the collar on forward side of STA 340 bulkhead. (e) Apply adhesive to faying surfaces of Drip Shield Assembly (672U7102-11) and Drip Shield Forward and Aft Brackets ( 672U7102-1 and 672U7102-2). Refer to SOPM 20-50-12 , Type 70 as an accepted procedure. (f) Acceptable to use BMS 5-95 Class B as a substitute for BMS 5-92. Refer to SOPM 20-15-19 as an ac- cepted procedure. FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY (SHEET 9 OF 9) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 56 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 57 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT STA 400 STA 380 STA 360 1962751 FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS (SHEET 1 OF 4) Original Issue: September 23, 2010 Revision 2 September 11, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 57 of 63 ### Page 58 FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS (SHEET 2 OF 4) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 58 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT ### Page 59 (OCR) BOEING SERVICE BULLETIN 747-25A3581 ALERT ALERT STA 340 BULKHEAD 1964889 FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS (SHEET 3 OF 4) Original Issue: September 23, 2010 Revision 2 September 11, 2012 _ Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 747-25A3581 Work - See page 1 for details. 59 of 63 ### Page 60 The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure. More DataQtyIdentificationNameTaskStep (a) (c) (e)1672U7102-6DRIP SHIELD - DE- FLECTOR Install (New)1 (b) (c) (f)1672U7102-13DRIP SHIELD - DE- FLECTOR PLATE Install (New)2 (b) (c)4672U7102-12DRIP SHIELD - DE- FLECTOR PLATE Install (New)3 (d)1672U7102-14DRIP SHIELD - DE- FLECTOR Install (New)4 (a) Bond to the inside face of aft edge of drip shield gutter. Bond flanges of the deflector shield to the STA 400 bulkhead using BMS 5-92. Refer to SOPM 20-50-12, Type 70 as an accepted procedure. The Deflector Shield needs to be bonded at least 0.125" below the existing row of hi-locks, located at WL 186.29; this dimension is required to ensure that these fasteners can be inspected. (b) Bond on top of the deflector shield to bridge gaps inside the vertical stiffeners. Bond deflector plates to STA 400 bulkhead as required using BMS 5-92. Refer to SOPM 20-50-12, Type 70 as an accepted pro- cedure. (c) Apply Sealant BMS 5-95. Fill all gaps between STA 400 Bulkhead and deflector shield, gaps between deflector shield and deflector plates, gaps between deflector plates and STA 400 Bulkhead, and gaps between deflector shield and drip shield to prevent water leaks. Refer to SOPM 20-15-19 as an accepted procedure. (d) Apply Sealant BMS 5-95. Fill all gaps between STA 340 Bulkhead and deflector shield. Refer to SOPM 20-15-19 as an accepted procedure. (e) Trim 672U7102-6 Deflector as required to avoid interference with bulkhead stiffener. Refer to BAC 5331 Type IV as an accepted procedure. (f) Trim 672U7102-13 Deflector as required to avoid interference with existing fasteners on bulkhead. Refer to BAC 5331 Type IV as an accepted procedure. FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS (SHEET 4 OF 4) Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 23, 2010 747-25A3581Revision 2 September 11, 2012 60 of 63 BOEING SERVICE BULLETIN 747-25A3581 ALERTALERT The text continues at https://openairdocs.org/service-documents/boeing/747-25a3581/file/d4e2841c96bb.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. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.