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Commercial Airplanes 737 Service Bulletin
SPECIAL ATTENTION Number: 737-32-1448 Original Issue: May 19, 2011 Revision 2: August 02, 2017 ATA System: 3211 SUBJECT: LANDING GEAR - Main Landing Gear - Forward and Aft Trunnion Pin Assemblies Inspection and 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 © 2011 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Unpublished Work.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: May 19, 2011 737-32-1448Revision 2: August 02, 2017 1 of 226
4.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 2 of 226 BOEING SERVICE BULLETIN 737-32-1448
BLANK PAGE
Table of Contents
Revision Transmittal Sheet7
S u m m a r y9
1. PLANNING INFORMATION ........................................ 1 5 A . E f f e c t i v i t y ............................................... 1 5
1. Airplanes ............................................ 1 5 2 . S p a r e s A f f e c t e d ........................................ 3 6 B. Concurrent Requirements ...................................... 3 7 C. Reason ................................................ 3 7 D. Description .............................................. 3 8 E. Compliance .............................................. 4 1 F . A p p r o v a l ............................................... 6 0 G. Manpower .............................................. 6 1 H. Weight and Balance Changes .................................... 6 7 I. Electrical Load Data ......................................... 6 8 J . R e f e r e n c e s .............................................. 6 8
1. Existing Data: ......................................... 6 8
2. Data Supplied with this Service Bulletin: ........................... 6 8
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 6 8 K. Publications Affected ........................................ 6 9 L. Interchangeability and Intermixability of Parts ........................... 6 9 M. Software Accomplishment Summary ................................ 6 9
2. MATERIAL INFORMATION ........................................ 7 1 A. Material - Price and Availability ................................... 7 1 B. Industry Support Information .................................... 7 2 C. Parts Necessary for Each Airplane ................................. 7 2 1 . K i t s / P a r t s ............................................ 7 2
2. Parts and Materials Supplied by the Operator ........................ 7 4
3. Parts Modified and Reidentified ................................ 7 6
4. Parts Removed and Not Replaced .............................. 7 8 D. Parts Necessary to Change Spares ................................. 7 8 E. Special Tooling - Price and Availability ............................... 7 8 F. Special Tooling Necessary to do this Service Bulletin ....................... 7 8
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 7 9 A. GENERAL INFORMATION ..................................... 7 9 B. WORK INSTRUCTIONS ....................................... 8 0 FIGURE 1: LEFT MAIN LANDING GEAR (MLG) OUTER CYLINDER ASSEMBLY AND TRUNNION PIN ASSEMBLIES INSPECTION .................................. 9 6 FIGURE 2: MAIN LANDING GEAR (MLG) FORWARD TRUNNION PIN ASSEMBLY INSPECTION . 98 FIGURE 3: MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY INSPECTION ..... 9 9 FIGURE 4: RIGHT MAIN LANDING GEAR (MLG) OUTER CYLINDER ASSEMBLY AND TRUNNION PIN ASSEMBLIES INSPECTION ................................. 1 0 0 FIGURE 5: LEFT MAIN LANDING GEAR (MLG) FORWARD OUTER CYLINDER TRUNNION BUSHING REPLACEMENT [Group 1-2, 4-5] .............................. 1 0 2 FIGURE 6: LEFT MAIN LANDING GEAR (MLG) FORWARD OUTER CYLINDER TRUNNION BUSHING REPLACEMENT [Group 3, 6] ................................ 1 0 6 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 3 of 226 BOEING SERVICE BULLETIN 737-32-1448
FIGURE 7: LEFT MAIN LANDING GEAR (MLG) AFT OUTER CYLINDER TRUNNION BUSHING REPLACEMENT [Group 1-2, 4-5] .............................. 1 1 0 FIGURE 8: LEFT MAIN LANDING GEAR (MLG) AFT OUTER CYLINDER TRUNNION BUSHING REPLACEMENT [Group 3, 6] ................................ 1 1 5 FIGURE 9: MAIN LANDING GEAR (MLG) FORWARD TRUNNION PIN CROSS BOLT BUSHING REPLACEMENT [Group 1, 4] ................................ 1 2 0 FIGURE 10: LEFT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY, AFT TRUNNION BEARING BALL AND AFT TRUNNION BEARING RACE REMOVAL [Group 1-3] .... 1 2 2 FIGURE 11: MAIN LANDING GEAR (MLG) AFT TRUNNION PIN CROSS BOLT BUSHING REPLACEMENT [Group 1-2, 4-5] ........................................ 1 2 5 FIGURE 12: MAIN LANDING GEAR (MLG) AFT TRUNNION PIN CROSS BOLT BUSHING REPLACEMENT [Group 3, 6] .......................................... 1 2 7 FIGURE 13: MAIN LANDING GEAR (MLG) AFT TRUNNION BEARING RACE INSPECTION .... 1 2 9 FIGURE 14: LEFT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY, AFT TRUNNION BEARING BALL AND AFT TRUNNION BEARING RACE INSTALLATION [Group 1-2] . 130 FIGURE 15: LEFT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY, AFT TRUNNION BEARING BALL AND AFT TRUNNION BEARING RACE INSTALLATION [Group 3] . . 134 FIGURE 16: LEFT MAIN LANDING GEAR INSTALLATION ....................... 1 3 8 FIGURE 17: RIGHT MAIN LANDING GEAR (MLG) FORWARD OUTER CYLINDER TRUNNION BUSHING REPLACEMENT [Group 1-2, 4-5] .............................. 1 4 1 FIGURE 18: RIGHT MAIN LANDING GEAR (MLG) FORWARD OUTER CYLINDER TRUNNION BUSHING REPLACEMENT [Group 3, 6] ................................ 1 4 5 FIGURE 19: RIGHT MAIN LANDING GEAR (MLG) AFT OUTER CYLINDER TRUNNION BUSHING REPLACEMENT [Group 1-2, 4-5] .............................. 1 4 9 FIGURE 20: RIGHT MAIN LANDING GEAR (MLG) AFT OUTER CYLINDER TRUNNION BUSHING REPLACEMENT [Group 3, 6] ................................ 1 5 4 FIGURE 21: RIGHT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY, AFT TRUNNION BEARING BALL AND AFT TRUNNION BEARING RACE REMOVAL [Group 1-3] .... 1 5 9 FIGURE 22: RIGHT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY, AFT TRUNNION BEARING BALL AND AFT TRUNNION BEARING RACE INSTALLATION [Group 1-2] . 162 FIGURE 23: RIGHT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY, AFT TRUNNION BEARING BALL AND AFT TRUNNION BEARING RACE INSTALLATION [Group 3] . . 166 FIGURE 24: RIGHT MAIN LANDING GEAR INSTALLATION ...................... 1 7 0 FIGURE 25: MAIN LANDING GEAR TRUNNION HOUSING ASSEMBLY RETAINER AND SEAL INSPECTION [Group 1-2, 4-5, Configuration 1] ............................... 1 7 3 FIGURE 26: MAIN LANDING GEAR TRUNNION HOUSING ASSEMBLY RETAINER AND SEAL REPLACEMENT [Group 1-2, 4-5] .............................. 1 7 5 FIGURE 27: LEFT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY REMOVAL [Group 4-6] ................................................. 1 7 7 FIGURE 28: LEFT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY INSTALLATION [Group 4 - 5 ] ............................................... 1 8 0 FIGURE 29: LEFT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY INSTALLATION [Group 6 ] ................................................ 1 8 3 FIGURE 30: RIGHT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY REMOVAL [Group 4 - 6 ] ............................................... 1 8 6 FIGURE 31: RIGHT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY INSTALLATION [Group 4 - 5 ] ............................................... 1 8 9 FIGURE 32: RIGHT MAIN LANDING GEAR (MLG) AFT TRUNNION PIN ASSEMBLY INSTALLATION [Group 6 ] ................................................ 1 9 2 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 4 of 226 BOEING SERVICE BULLETIN 737-32-1448
APPENDIX A: FORWARD OUTER CYLINDER TRUNNION BUSHING - MAKE [Group 1-2, 4-5] .... 1 9 5 APPENDIX B: FORWARD OUTER CYLINDER TRUNNION BUSHING - MAKE [Group 3, 6] ...... 1 9 8 APPENDIX C: AFT OUTER CYLINDER TRUNNION BUSHING - MAKE [Group 1-2, 4-5] ........ 2 0 1 APPENDIX D: AFT OUTER CYLINDER TRUNNION BUSHING - MAKE [Group 3, 6] .......... 2 0 4 APPENDIX E: FORWARD TRUNNION PIN CROSS BOLT BUSHING - MAKE [Group 1, 4] ....... 2 0 7 APPENDIX F: AFT TRUNNION PIN CROSS BOLT BUSHING - MAKE [Group 1-2, 4-5] ......... 2 0 9 APPENDIX G: AFT TRUNNION PIN CROSS BOLT BUSHING - MAKE [Group 3, 6] ........... 2 1 1 APPENDIX H: AFT TRUNNION BEARING BALL - CHANGE [Group 1-2] ................. 2 1 3 APPENDIX I: AFT TRUNNION BEARING BALL - CHANGE [Group 3] .................. 2 1 6 APPENDIX J: AFT TRUNNION BEARING RACE - CHANGE [Group 1-2] ................ 2 1 9 APPENDIX K: AFT TRUNNION BEARING RACE - CHANGE [Group 3] .................. 2 2 2 APPENDIX L: DIMENSIONING SYMBOLS ................................. 2 2 5 APPENDIX M: PART DEMAND INTENT ................................... 2 2 6 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 5 of 226 BOEING SERVICE BULLETIN 737-32-1448
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 6 of 226 BOEING SERVICE BULLETIN 737-32-1448
BLANK PAGE
Commercial Airplanes 737 Service Bulletin
SPECIAL ATTENTION Revision Transmittal SheetNumber: 737-32-1448Original Issue: May 19, 2011 Revision 2: August 02, 2017 ATA System: 3211 SUBJECT: LANDING GEAR - Main Landing Gear - Forward and Aft Trunnion Pin Assemblies Inspection and Change This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION Federal Aviation Administration (FAA) Airworthiness Directive AD 2016-18-01 is related to this service bulletin.
The effective date of AD 2016-18-01 is October 5, 2016.
The Federal Aviation Administration (FAA) will possibly release an additional Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
Airplane line numbers 3527 through 6510 were added to the service bulletin effectivity, in new groups 4-6.
Effects of this Revision on airplanes on which the Original Issue or Revision 1 was previously done:
ActionConditionGroup Do a review of maintenance records or inspect the Main Landing Gear to find if any of the existing part numbers in Paragraph 2.C.3., Parts Modified and Reidentified are installed on the airplane, and do additional actions based on applicable conditions in accordance with Paragraph 1.E., Compliance.
Accomplished Service Bulletin 737- 32-1448 Original Issue or Revision 1 1-3
REASON FOR REVISION This revision is sent to extend the effectivity of this service bulletin to airplane line numbers 3527 through 6510.
The Main Landing Gear (MLG) affected by the change in this service bulletin are rotable parts, and these airplanes may no longer have their original MLG assemblies due to MLG maintenance activity. The engineering drawings have been revised to not allow the existing part numbers in Paragraph 2.C.3., Parts Modified and Reidentified to be installed on airplane line numbers 6511 and on. Instructions have been added to the service bulletin to do a review of maintenance records or inspect the MLG to see if the currently installed MLG requires inspection and change in accordance with this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 7 of 226
These sections were changed:
1. In Summary, Background: Added SRP reference.
2. In Summary, Action: Added new step and updated applicability.
3. In the Summary Illustration: Added new groups.
4. In Paragraph 1.A., Effectivity: Changed to include additional airplanes and added new groups.
5. In Paragraph 1.C., Reason: Added revision information and SRP reference.
6. In Paragraph 1.D., Description: Added new step, updated applicability, and added revision information.
7. In Paragraph 1.E., Compliance: Added AD reference and updated the compliance tables.
8. In Paragraph 1.F., Approval: Added AD reference and additional paragraphs.
9. In Paragraph 1.G., Manpower: Updated applicability.
10. In Paragraph 1.J., References: Added AD reference.
11. In Paragraph 1.K., Publications Affected: Added publication.
12. In Paragraph 2., Material Information: Updated applicability.
13. In Paragraph 2.C.3., Parts Modified and Reidentified: Updated table.
14. In Paragraph 3.A., General Information: Added new note.
15. In Paragraph 3.B., Work Instructions: Added new steps and updated applicability.
16. In Figures 5 - 12, 14, 15, 17 - 23, 25, and 26: Updated applicability.
17. Added new Figures 27 - 32.
18. In Appendixes A - G: Updated applicability.
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.
REVISION HISTORY May 19, 2011Original Issue:
May 29, 2015Revision 1:
August 02, 2017Revision 2:
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 8 of 226 BOEING SERVICE BULLETIN 737-32-1448
Commercial Airplanes 737 Service Bulletin
SPECIAL ATTENTION SummaryNumber: 737-32-1448Original Issue: May 19, 2011 Revision 2: August 02, 2017 ATA System: 3211 SUBJECT: LANDING GEAR - Main Landing Gear - Forward and Aft Trunnion Pin Assemblies Inspection and Change BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS DOCUMENT IMMEDIATELY.
CONCURRENT REQUIREMENTS None.
BACKGROUND This service bulletin is sent to make sure the left and right Main Landing Gear (MLG) forward and aft trunnion pin assemblies and the components related to the MLG forward and aft trunnion pin assemblies remain serviceable. Corrosion and chrome damage has been found on some of these components. If this service bulletin is not done, corrosion and chrome plate damage on these components could cause the MLG forward and aft trunnion pin assemblies to crack which could result in a MLG collapse.
Several operators have reported heavy corrosion and pitting of the MLG forward and aft trunnion pin assemblies.
Boeing found a number of causes for this damage which include insufficient lubrication, joint contamination and mixed greases. It was found that the lubrication between the forward and aft trunnion pin assemblies and the outer cylinder assembly bushings and the lubrication of the aft trunnion bearing ball was not sufficient to prevent wear and corrosion. It was also found that the clearances between the forward and aft trunnion pin cross bolt bushings and the cross bolts could affect the rate of wear and corrosion of MLG trunnion pin assemblies. To correct these problems, Boeing has changed the design of the outer cylinder forward and aft trunnion bushings to improve lubrication around the outer diameter of the forward and aft trunnion pin assemblies and changed the design of aft trunnion bearing split ball to add a circumferential lube groove and larger diameter through holes which improves lubrication around the aft pin at the interface with the aft trunnion bearing. In addition Boeing has changed the design of the forward and aft trunnion pin cross bolt bushings for the trunnion pins to reduce relative motion of each pin within the outer cylinder assembly bushings and reduce wear.
Accomplishment of this service bulletin lubricates and inspects existing MLG forward and aft trunnion pin assemblies at regular intervals to prevent damage and corrosion. Instructions are given to overhaul or replace damaged or corroded forward and aft trunnion pin assemblies. In addition, instructions are provided to install new forward and aft trunnion bushings in the MLG outer cylinder assembly, install new trunnion pin cross bolt bushings in the forward and aft trunnion pins, install a new/changed aft trunnion bearing ball, install a new/changed aft trunnion bearing race, and install a new forward trunnion pin housing assembly seal and retainer configuration on applicable airplanes. Installation of the new trunnion bushings in the MLG outer cylinder assembly, new/changed aft trunnion bearing ball and aft trunnion bearing race are the terminating actions to the repeat lubrication and repeat inspections given in this service bulletin and will improve grease distribution which will reduce wear in the joint and prevent corrosion.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 9 of 226
Boeing recommends to do this service bulletin at the same time as 737-32-1376 or 737-32-1402 if applicable.
Boeing Service Related Problem (SRP) 737-SRP-32-0165 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 737NG FTD 32-09001 is related to this service bulletin.
Boeing Service Related Problem (SRP) 737NG-32-0213 is related to this service bulletin.
This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Paragraph 1.E., Compliance and Paragraph
1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesNoWeight and Balance Change Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedYesPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsYesKits/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 (PRR 38275-165S)
1. Do a review of maintenance records or inspect the MLG to find if any of the existing part numbers in Paragraph 2.C.3., Parts Modified and Reidentified are installed on the airplane. If any applicable part number is found, do the work packages that follow.
Group 1-2, Configuration 1; Group 3; Group 4-5, Configuration 1; Group 6:
WORK PACKAGE 1:
1. Lubricate the forward and aft trunnion pin assemblies on the left and right MLG.
Group 1-2, Configuration 1; Group 3; Group 4-5, Configuration 1; Group 6:
WORK PACKAGE 2:
1. Do a general visual inspection and a detailed inspection if necessary of the forward and aft trunnion pin assemblies on the left and right MLG.
NOTE: Make sure that you have serviceable trunnion pins available in case the trunnion pins inspected are found with corrosion or damage and need to be replaced.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 10 of 226 BOEING SERVICE BULLETIN 737-32-1448
a. If corrosion or damage is found on the forward trunnion pin assembly:
(1) Group 1-2, 4-5, Configuration 1:
Overhaul or replace the forward trunnion pin assembly and install a new forward trunnion pin housing assembly seal and retainer configuration.
(2) Group 3, 6:
Overhaul or replace the forward trunnion pin assembly.
b. If corrosion or damage is found on the aft trunnion pin assemblies, overhaul or replace the aft trunnion pin assemblies.
c. If no corrosion or damage is found on the fwd and aft trunnion pin assemblies, no overhaul or replacement of the forward and aft trunnion pin assemblies is necessary.
2. Lubricate the forward and aft trunnion pin assemblies on the left and right MLG.
Group 1-2, Configuration 1; Group 3; Group 4-5, Configuration 1; Group 6:
WORK PACKAGE 3:
1. Group 1-2, Configuration 1:
As terminating action to repeat lubrications and repeat inspections given in compliance, replace the forward and aft outer cylinder trunnion bushings, the forward and aft trunnion pin cross bolt bushings, the aft bearing ball and aft bearing race with new or changed parts and install a new forward trunnion pin housing assembly seal and retainer configuration.
2. Group 3:
As terminating action to repeat lubrications and repeat inspections given in compliance, replace the forward and aft outer cylinder trunnion bushings, the forward and aft trunnion pin cross bolt bushings, the aft bearing ball and aft bearing race with new or changed parts.
3. Group 4-5, Configuration 1:
As terminating action to repeat lubrications and repeat inspections given in compliance, replace the forward and aft outer cylinder trunnion bushings, and the forward and aft trunnion pin cross bolt bushings with new or changed parts and install a new forward trunnion pin housing assembly seal and retainer configuration.
4. Group 6:
As terminating action to repeat lubrications and repeat inspections given in compliance, replace the forward and aft outer cylinder trunnion bushings, and the forward and aft trunnion pin cross bolt bushings with new or changed parts.
Group 1-2, 4-5, Configuration 2:
WORK PACKAGE 4:
1. Install a new forward trunnion pin housing assembly seal and retainer configuration.
EFFECTIVITY 737-600/700/700C/800/900/900ER Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 11 of 226 BOEING SERVICE BULLETIN 737-32-1448
COMPLIANCE Federal Aviation Administration (FAA) Airworthiness Directive AD 2016-18-01 is related to this service bulletin.
The effective date of AD 2016-18-01 is October 5, 2016.
The Federal Aviation Administration (FAA) will possibly release an additional 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 configuration changes, inspection, and/or overhaul procedures given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
Operators are encouraged to complete the survey provided in APPENDIX M of this service bulletin to help Boeing predict the quantity and timing of the Boeing Supplied Kits/Parts.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 19, 2011 737-32-1448Revision 2: August 02, 2017 12 of 226 BOEING SERVICE BULLETIN 737-32-1448