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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-24A1148 Original Issue: December 06, 2001 Revision 2: September 14, 2020 ATA System: 2400 2750 2760 2840 2910 SUBJECT: ELECTRICAL POWER - General - Corrosion Protection of the Electrical Connectors in the Main Wheel Well 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 © 2001 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Unpublished Work.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: December 06, 2001 737-24A1148Revision 2: September 14, 2020 1 of 61
5.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 06, 2001 737-24A1148Revision 2: September 14, 2020 2 of 61 BOEING SERVICE BULLETIN 737-24A1148
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Table of Contents
Revision Transmittal Sheet5
Summary9
1. PLANNING INFORMATION13
A. Effectivity13
1. Airplanes13
2. Spares Aff ected22
B. Concurrent Requirements22
C. Reason22
D. Description23
E. Compliance24
F. Approval24
G. Manpower25
H. Weight and Balance Changes25
I. Electrical Load Data26
J. References26
1. Existing Data:26
2. Data Supplied with this Ser vice Bulletin:26
3. Installation Drawings Used in the Prepar ation of this Ser vice Bulletin:26
K. Publications Affected27
L. Interchangeability and Inter mixability of P arts27
M. Software Accomplishment Summar y27
2. MATERIAL INFORMATION29
A. Material - Pr ice and Availability29
B. Industry Suppor t Information29
C. Parts Necessary for Each Air plane29
1. Kits/Parts:29
2. Parts and Materials Supplied by the Operator:30
3. Parts Modified and Reidentified:30
4. Parts Removed and Not Replaced:31
D. Parts Necessary to Change Spares31
E. Special Tooling - Pr ice and Availability31
F. Special Tooling Necessary to do this Ser vice Bulletin31
3. ACCOMPLISHMENT INSTRUCTIONS33
A. GENERAL INFORMATION33
B. WORK INSTRUCTIONS33
FIGURE 1: MAIN WHEEL WELL ELECTRICAL CONNECTOR REPLACEMENT [Group 1]35
FIGURE 2: CIC APPLICATION [Group 2]42
FIGURE 3: REPEAT INSPECTIONS - RESISTANCE MEASUREMENTS49
FIGURE 4: REPEAT INSPECTIONS - EXTERIOR CORR OSION INSPECTION52
FIGURE 5: REPEAT INSPECTIONS - INTERIOR CORROSION OR FLUID CONTAMINATION INSPECTION
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 06, 2001 737-24A1148Revision 2: September 14, 2020 3 of 61 BOEING SERVICE BULLETIN 737-24A1148
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 06, 2001 737-24A1148Revision 2: September 14, 2020 4 of 61 BOEING SERVICE BULLETIN 737-24A1148
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Commercial Airplanes 737 Service Bulletin ALERT Revision Transmittal SheetNumber: 737-24A1148Original Issue: December 06, 2001 Revision 2: September 14, 2020 ATA System: 2400 2750 2760 2840 2910 SUBJECT: ELECTRICAL POWER - General - Corrosion Protection of the Electrical Connectors in the Main Wheel Well This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2019-NM-165-AD is related to this service bulletin.
Federal Aviation Administration (FAA) Airworthiness Directive AD 2005-18-23 is related to this service bulletin.
Effects of this Revision on airplanes on which Revision 1 was previously done:
None.
REASON FOR REVISION This revision is sent to – Add the 737-900ER minor model in the model designation – Changed resistance for connector D4850 to meet Airworthiness Limitation.
– Add Federal Aviation Administration (FAA) Airworthiness Directive AD 2005-18-23 and NPRM 2019-NM-165-AD – Change the inspection interval and the connector and backshell replacement requirements – Change approval statements – Remove requirement to disconnect the J-side of the connector from the disconnect bracket during the repeat interval inspection.
– Changes the test titles to agree with the Aircraft Maintenance Manual (AMM), The data given in Alternative Method of Compliance Notice (AMOC) 737-24A1148-AMOC-01 is included in this revision.
These sections were changed:
1. In Summary, BACKGROUND, added compliance reference.
2. In Summary, ACTION, added reference to operational tests.
3. In Summary, COMPLIANCE, added NPRM and FAA AD statements, and compliance statements.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 06, 2001 737-24A1148Revision 2: September 14, 2020 5 of 61
4. In Summary, MANPOWER, added minor model designation.
5. In Paragraph 1.C., Reason, added compliance reference, revision statement, and AMOC reference.
6. In Paragraph 1.D., Description, added test reference, revision statement and Maintenance Zone information.
7. In Paragraph 1.E., Compliance, added NPRM and FAA AD statements, and compliance statements.
8. In Paragraph 1.F., Approval, added approval statement for non-EASA models and AMOC statement.
9. In Paragraph 1.J.1., Existing Data, added and changed references.
10. In Paragraph 1.K., Publications Affected, added publication references and Damage Tolerance Based Structural Inspections statement.
11. In Paragraph 1.L., Interchangeability and Intermixability of Parts, revised statement.
12. In Paragraph 1.M., Software Accomplishment Summary, added section.
13. In Paragraph 2.A., Material - Price and Availability, added Group 2 and 3 information.
14. In Paragraph 2.C.2., Parts and Materials Supplied by Operator, changed supplier information and added alternate part number.
15. In Paragraph 3.A., GENERAL INFORMATION, added WARNING, CAUTION and Notes.
16. In Paragraph 3.B., WORK INSTRUCTIONS, corrected statement.
17. In Paragraph 3.B., WORK INSTRUCTIONS, PART 3, added steps to remove and restore electrical power to the airplane and renumbered steps.
18. In FIGURE 1, corrected bubble steps, changed notes, added alternate material, changed test titles and added alternate test.
19. In FIGURE 2, Step table, added a row before Step 1 to remove electrical power from the airplane.
20. In FIGURE 2, added connector locator, added WARNING, changed notes, added alternate material, changed test titles and added alternate test.
21. In FIGURE 3, added connector locator, added WARNING and changed notes.
22. In FIGURE 4, added connector locator and added more data information.
23. In FIGURE 5, added connector locator, added WARNING, changed notes, added alternate material, changed test titles and added alternate test.
Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity and format changes, to show the location of all content changes.
Pages with no vertical lines have no changes.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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REVISION HISTORY December 06, 2001Original Issue:
July 10, 2003Revision 1:
September 14, 2020Revision 2:
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 06, 2001 737-24A1148Revision 2: September 14, 2020 7 of 61 BOEING SERVICE BULLETIN 737-24A1148
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 06, 2001 737-24A1148Revision 2: September 14, 2020 8 of 61 BOEING SERVICE BULLETIN 737-24A1148
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-24A1148Original Issue: December 06, 2001 Revision 2: September 14, 2020 ATA System: 2400 2750 2760 2840 2910 SUBJECT: ELECTRICAL POWER - General - Corrosion Protection of the Electrical Connectors in the Main Wheel Well
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 The Federal Aviation Administration (FAA) has issued an Airworthiness Directive (AD) which requires incorporation of this service bulletin.
Several operators have reported significant corrosion to electrical connectors located in the main wheel well.
The airplanes in these operations land on runways that are treated with deicing fluids that contain potassium formate or potassium acetate. These deicing fluids are used in multiple locations in the world.
Corrosion is an indicator that the electrical connectors may have been exposed to potassium formate and/or potassium acetate. Loss of cadmium-plating of the electrical connectors may allow a path for moisture ingress which may lead to electrical shorting of the connector. Electrical shorting of the electrical connectors in the wheel well can cause incorrect function of critical systems necessary for safe flight.
Tests conducted at Boeing have demonstrated that corrosion inhibiting compounds (CICs) can be used to form a shield against the contamination and corrosion caused by the potassium formate or potassium acetate. Tests conducted at Boeing have also demonstrated that the recommended CICs do not affect the electrical components or the systems.
The work given in this service bulletin will increase the corrosion resistance of the electrical connectors located in the main wheel well. This will improve the reliability and maintainability of the electrical components that are exposed to potassium formate or potassium acetate.
An evaluation of exposure to runway deicing fluids that contain potassium formate or potassium acetate and repetitive inspections of connectors and application of CICs must be completed at the time intervals given in Paragraph 1.E., Compliance.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 06, 2001 737-24A1148Revision 2: September 14, 2020 9 of 61
Boeing Service Related Problem (SRP) 737NG-SRP-26-0056S is related to this service bulletin. Boeing Service Bulletins 737-24-1149 and 737-26-1112 are related to this service bulletin. Boeing Service Letter 737-SL-24-171 is related to this service bulletin.
ACTION (PRR 38275-36S) In Group 1 airplanes, remove the seven wire bundle connectors from the LRU components and the disconnect brackets.
Examine the LRUs and replace if necessary. Apply the internal avionics CIC to the LRU connectors.
Examine the seven connectors and backshells and replace if necessary. Examine the contacts for corrosion and replace if necessary. Apply the internal avionics CIC. Mate the connectors. Do an operational test of the affected systems. Apply the external CIC to the connectors. Return the airplane to service.
In Group 2 airplanes, apply the internal avionics CIC to the LRU connectors. Apply the internal avionics CIC to the seven connectors. Apply the external CIC to the seven connectors. Mate the connectors. Do an operational test of the affected systems. Apply the external CIC to the connectors. Return the airplane to service.
In Group 1 through 3 airplanes, examine the connectors and backshells and replace if necessary. Complete operational tests if the connector has been disconnected or replaced. Apply CICs at the time intervals given in Paragraph 1.E., Compliance.
EFFECTIVITY See Effectivity section 1.A.
COMPLIANCE Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2019-NM-165-AD is related to this service bulletin.
Federal Aviation Administration (FAA) Airworthiness Directive AD 2005-18-23 is related to this service bulletin.
The effective date of AD 2005-18-23 is October 19, 2005.
Group 1-2:
Boeing recommends that operators accomplish this service bulletin within 12 months of the release date of Revision 1 of this service bulletin.
Group 3:
Boeing recommends that operators accomplish this service bulletin within 12 months of the release date of Revision 1 of this service bulletin or 12 months after delivery date of the airplane whichever occurs later.
Connector and backshell replacement is required immediately if the cumulative area of corrosion is greater than 10% of the total backshell area. If the cumulative area of corrosion is less than 10% of the total backshell surface area, the backshell may be cleaned only.
Boeing recommends that each operator request data about the components of the fluids used to deice the runways that support their operations. Use this information to determine the applicability of the changes and inspections given in this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 06, 2001 737-24A1148Revision 2: September 14, 2020 10 of 61 BOEING SERVICE BULLETIN 737-24A1148
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For airplanes which are exposed to runway deicing fluids that contain potassium formate or potassium acetate, within 90 days of making this determination Boeing recommends the examination of connectors and application of CICs, with a repeat intervalevery 24 months. For airplanes which are not exposed to runway deicing fluids that contain potassium formate or potassium acetate, no inspections are required. A re-evaluation of exposure must be completed at 12 month intervals. If future exposure occurs, complete this service bulletin.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes and inspections given in this service bulletin.
MANPOWER Elapsed HoursTotal Task HoursAirplanes
5.010.0737-600, -700, -700C, -800, -900, -900ER
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: December 06, 2001 737-24A1148Revision 2: September 14, 2020 11 of 61 BOEING SERVICE BULLETIN 737-24A1148
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 06, 2001 737-24A1148Revision 2: September 14, 2020 12 of 61 BOEING SERVICE BULLETIN 737-24A1148