### Commercial **Airplanes** 

# 777

Service Bulletin **ALERT Number:**  **777-32A0103** Original Issue: September 11, 2015 Revision 1: December 10, 2015 ATA System: 3211 **SUBJECT:** LANDING GEAR - Main Landing Gear - Aft Trunnion Pin Inspection and Replacement 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. 9E991 ECCN: 

## BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2015 Boeing. Unpublished Work. All Rights Reserved. Treatment of this document and its content is governed by contract with Boeing. Rights to use this document are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The Boeing Company. Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and Boeing liveries are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing.

Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 1of51 3.0Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 2of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**

BLANK PAGE**Table of Contents**

Revision Transmittal Sheet

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Summary

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1. PLANNING INFORMATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 A. Effectivity

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1. Airplanes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2. Spares Affected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 B. Concurrent Requirements

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 C. Reason

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 D. Description

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 E. Compliance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 F. Approval

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 G. Manpower

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 H. Weight and Balance Changes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 I. Electrical Load Data

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 J. References

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 1. Existing Data:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2. Data Supplied with this Service Bulletin:

. . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3. Installation Drawings Used in the Preparation of this Service Bulletin:

. . . . . . . . . . . 21 K. Publications Affected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 L. Interchangeability and Intermixability of Parts

. . . . . . . . . . . . . . . . . . . . . . . . . . . 21 M. Software Accomplishment Summary

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2. MATERIAL INFORMATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 A. Material - Price and Availability

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 B. Industry Support Information

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 C. Parts Necessary for Each Airplane

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 1. Kits/Parts

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2. Parts and Materials Supplied by the Operator

. . . . . . . . . . . . . . . . . . . . . . . . 25 3. Parts Modified and Reidentified

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4. Parts Removed and Not Replaced

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 D. Parts Necessary to Change Spares

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 E. Special Tooling - Price and Availability

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 F. Special Tooling Necessary to do this Service Bulletin

. . . . . . . . . . . . . . . . . . . . . . . 26 3. ACCOMPLISHMENT INSTRUCTIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 A. GENERAL INFORMATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 B. WORK INSTRUCTIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 FIGURE 1: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - DETAILED INSPECTION

. . . . . . 32 FIGURE 2: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - DETAILED INSPECTION

. . . . . 34 FIGURE 3: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT[Group 1]

. . . . . 36 FIGURE 4: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT[Group 1]

. . . . 39 FIGURE 5: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT[Group 2]

. . . . . 42 FIGURE 6: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT[Group 2]

. . . . 45 APPENDIX A: LOGIC DIAGRAM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 APPENDIX B: ACCEPTABLE AFT TRUNNION PIN ASSEMBLY PART NUMBERS

. . . . . . . . . . . . 50 APPENDIX C: PART DEMAND INTENT SURVEY

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 3of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 4of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**

BLANK PAGE

### Commercial **Airplanes** 

# 777

Service Bulletin **ALERT Revision Transmittal Sheet**  **Number: 777-32A0103**  Original Issue: September 11, 2015 Revision 1: December 10, 2015 ATA System: 3211 **SUBJECT:** LANDING GEAR - Main Landing Gear - Aft Trunnion Pin Inspection and Replacement This revision includes all pages of the service bulletin. **COMPLIANCE INFORMATION RELATED TO THIS REVISION** 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. Effects of this Revision on airplanes on which the Original Issue was previously done: None. **REASON FOR REVISION** This revision is sent to remove airplane line numbers 1331 through 1343 from the effectivity. These airplanes were or will be delivered after the Original Issue date of this service bulletin (SB). The SB is revised to reflect type design at the time of delivery. However, it is understood that the FAA Airworthiness Directive related to this SB will be applicable to all Boeing 777 airplanes due to concerns about rotable parts. These sections were changed: 1. Paragraph 1.A.1., Airplanes: Removed line numbers 1331 through 1343. 2. Paragraph 1.K.1, Publications: Removed a publication reference. 3. Paragraph 2.A., Material - Price and Availability: Revised table. 4. Paragraph 2.B., Industry Support Information: Revised warranty statement. The data given in Information Notice 777-32A0103 IN 01 is included in this revision. 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. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 5of51**REVISION HISTORY** September 11, 2015

Original Issue: December 10, 2015 Revision 1:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 6of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**

### Commercial **Airplanes** 

# 777

Service Bulletin **ALERT Summary**  **Number: 777-32A0103**  Original Issue: September 11, 2015 Revision 1: December 10, 2015 ATA System: 3211 **SUBJECT:** LANDING GEAR - Main Landing Gear - Aft Trunnion Pin Inspection and Replacement 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** None. **BACKGROUND** This service bulletin gives instructions to perform a records check or Detailed Inspection of the main landing gear (MLG) for aft trunnion pins with serial numbers that begin with "EGL" or "MAL", and to replace them if found. MLG aft trunnion pins with these serial numbers could have a manufacturing defect that can cause them to fracture. If this service bulletin is not done, fracture of a MLG aft trunnion pin could result in the collapse of a MLG, which could result in loss of control of the airplane during landing. After a landing where pilots were required to input corrections due to airplane yaw and roll to the right, the MLG aft trunnion pin was found to be fractured. Other damage included minor damage to the gear beam, trunnion door panel and a broken tie-rod. Materials analysis of the fractured pin showed that the crack started from an area of heat damage introduced during manufacturing. A review of gear overhaul records indicated that other pins manufactured by the same supplier had similar signs of heat damage, suspected to have been caused by abusive chrome grinding. This evidence suggests that the heat damage occurred during manufacturing, so it is possible that other airplanes can have aft trunnion pins with similar heat damage. Boeing Multi-Operator Message (MOM) MOM-MOM-15-0303-01B is related to this service bulletin. Operators that have identified the serial number in order to respond to the questions asked in this MOM do not need to do PART 1 of the work instructions. Boeing Service Related Problem (SRP)777-SRP-32-0202is related to this service bulletin. Boeing Fleet Team Digest (FTD)777 FTD 32-14005is related to this service bulletin.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 7of51This table is provided to operators for planning purposes only. Refer to the applicable sections for more

information. **Reference Affected**  **Planning Data** Paragraph 1.A.2., Spares Affected Yes Spares Affected Paragraph 1.E., Complianceand Paragraph 1.F., Approval Yes AD Related Paragraph 1.H., Weight and Balance Changes No Weight and Balance Change Paragraph 1.I., Electrical Load Data No Electrical Load Changed Paragraph 1.K., Publications Affected Yes Publications Affected Paragraph 1.K., Publications Affected No Airplane Flight Operations Affected (Flight CrewOperations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/Parts Yes Kits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator No Operator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin No Special Tooling Required

**ACTION** Do a records check or Detailed Inspection of the Main Landing Gear Aft Trunnion Pins to identify the serial number and to look for a "BASE METAL INSPECTED" marking. If the serial number begins with "EGL" or "MAL", and a "BASE METAL INSPECTED" marking is not found, replace the aft trunnion pin. If the serial number does not begin with "EGL" or "MAL", or a "BASE METAL INSPECTED" marking is found, no more work is necessary. **EFFECTIVITY** 777-200, -200LR, -300, -300ER, and 777F Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s). Refer to Paragraph 1.A.2., Spares Affected for the list of affected components. **COMPLIANCE** The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory. Refer to Paragraph 1.E., Compliance

. **INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are available for 777 airplanes in warranty as of November 17, 2014. Additionally, Boeing has elected to extend a business consideration for out-of-warranty airplanes with line numbers 1 through 504 and line number 784 (Business Consideration Airplanes). Please refer toParagraph 2.B., Industry Support Information

.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 8of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT 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 inAPPENDIX Cof 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: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 9of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 10of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**

### Commercial **Airplanes** 

# 777

Service Bulletin **ALERT Number:**  **777-32A0103** Original Issue: September 11, 2015 Revision 1: December 10, 2015 ATA System: 3211 **SUBJECT:** LANDING GEAR - Main Landing Gear - Aft Trunnion Pin Inspection and Replacement 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 toService Bulletin Index D624W001Part 3 for Airplane Variable Number, Line Number, and Serial Number data. This service bulletin is applicable to 777 Airplanes, line numbers 1-1330in 2 Groups. The Variable Numbers and Group Information for the applicable airplanes is given below. **DESCRIPTION CONFIGURATION**  **GROUP** 777-200 and -300 Airplanes

- 1 777-200LR, -300ER, and 777F Airplanes

- 2
Airplane Models: 777-200, 777-200LR, 777-300, 777-300ER, 777F **Group Variable Number**  1 WA001 - WA017 1 WA076 - WA080 1 WA086 - WA093 1 WA101 - WA104 1 WA116 - WA119

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 11of51**Group Variable Number**  1 WA131 - WA137 1 WA171 - WA175 1 WA196 - WA198 1 WA206 - WA212 1 WA221 - WA223 1 WA231 - WA232 1 WA241 - WA250 1 WA261 - WA266 1 WA281 - WA283 1 WA301 - WA304 1 WB001 - WB021 1 WB031 - WB046 1 WB051 - WB088 1 WB101 - WB106 1 WB121 - WB125 1 WB131 - WB148 1 WB151 - WB155 1 WB161 - WB177 1 WB181 - WB194 1 WB201 - WB215 1 WB231 - WB247 1 WB271 - WB273 1 WB276 - WB286 1 WB291 - WB302 1 WB306 - WB307 1 WB311 - WB337 1 WB341 - WB342 1 WB366 - WB368 1 WB371 - WB388 1 WB406 1 WB411 - WB413 1 WB416 - WB439 1 WB446 - WB453

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 12of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT Group**  **Variable Number** 1 WB476 1 WB481 - WB484 1 WB501 - WB512 1 WB531 - WB537 1 WB551 - WB554 1 WB591 - WB597 1 WB601 - WB606 1 WB611 - WB622 1 WB631 - WB638 1 WB646 - WB649 1 WC051 - WC073 1 WC101 - WC104 1 WC111 - WC120 1 WC221 - WC224 1 WC241 - WC243 1 WC281 - WC290 1 WC301 - WC308 1 WC361 - WC364 1 WC371 - WC374 1 WC381 - WC395 1 WC441 1 WC446 - WC449 1 WC456 - WC459 1 WC486 - WC493 1 WC506 - WC508 1 WC521 - WC522 1 WC531 - WC536 1 WC546 - WC548 1 WC556 1 WC566 - WC567 1 WC571 - WC574 1 WC581 1 WC586 - WC587

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 13of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT Group**  **Variable Number** 1 WC591 - WC595 2 WD001 - WD002 2 WD011 - WD018 2 WD031 - WD036 2 WD046 - WD055 2 WD066 - WD075 2 WD081 - WD089 2 WD091 2 WD096 2 WD101 - WD106 2 WD111 - WD112 2 WD116 - WD117 2 WD121 - WD122 2 WD501 - WD513 2 WD521 - WD541 2 WD546 - WD554 2 WD561 - WD573 2 WD581 - WD599 2 WD606 - WD609 2 WD621 - WD632 2 WD651 - WD665 2 WD671 - WD677 2 WD691 - WD709 2 WD741 - WD752 2 WD761 - WD771 2 WD786 - WD788 2 WD796 - WD837 2 WD846 - WD867 2 WD871 - WD899 2 WD911 - WD918 2 WD921 - WD932 2 WD936 - WD957 2 WD966 - WD970

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 14of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT Group**  **Variable Number** 2 WD981 - WD982 2 WD986 - WD987 2 WD991 - WD994 2 WD996 2 WE001 - WE007 2 WE011 - WE012 2 WE021 - WE026 2 WE031 - WE036 2 WE051 - WE057 2 WE071 - WE078 2 WE081 - WE084 2 WE091 - WE095 2 WE126 - WE147 2 WE151 - WE170 2 WE176 - WE178 2 WE186 - WE219 2 WE226 - WE231 2 WE236 - WE253 2 WE261 - WE267 2 WE271 - WE278 2 WE291 - WE296 2 WE301 - WE317 2 WE331 - WE343 2 WE351 - WE356 2 WE376 - WE377 2 WE381 2 WE386 - WE387 2 WE391 - WE392 2 WE396 - WE401 2 WE416 - WE420 2 WE426 - WE427 2 WE436 - WE439 2 WE441 - WE445

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 15of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT Group**  **Variable Number** 2 WE451 - WE458 2 WE471 - WE474 2 WE486 - WE491 2 WE501 - WE504 2 WE511 - WE513 2 WE526 - WE528 2 WE536 - WE539 2 WE556 - WE562 2 WE566 - WE567 2 WE591 2 WE601 - WE604 2 WE631 2 WF001 - WF004 2 WF016 - WF027 2 WF031 - WF043 2 WF046 - WF067 2 WF075 - WF077 2 WF081 - WF088 2 WF096 - WF101 2 WF106 - WF109 2 WF111 - WF118 2 WF121 - WF124 2 WF131 - WF133 2 WF136 - WF140 2 WF146 - WF147 2 WF151 - WF152 2 WF156 - WF160 2 WF166 - WF173 2 WF176 - WF177 2 WF181 - WF182

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 16of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**2. Spares Affected Examine your spares supply for the parts or components identified below . If any parts or components are found, refer to Paragraph 3.B., Work Instructionsfor the recommended action.

**Part Number** 161W0004-3 161W1301-1 161W1301-3 161W1301-5 161W1301-7 161W1301-9
**B. Concurrent Requirements**  None. **C. Reason**  This service bulletin gives instructions to perform a records check or Detailed Inspection of the main landing gear (MLG) for aft trunnion pins with serial numbers that begin with "EGL" or "MAL", and to replace them if found. MLG aft trunnion pins with these serial numbers could have a manufacturing defect that can cause them to fracture. If this service bulletin is not done, fracture of a MLG aft trunnion pin could result in the collapse of a MLG, which could result in loss of control of the airplane during landing. After a landing where pilots were required to input corrections due to airplane yaw and roll to the right, the MLG aft trunnion pin was found to be fractured. Other damage included minor damage to the gear beam, trunnion door panel and a broken tie-rod. Materials analysis of the fractured pin showed that the crack started from an area of heat damage introduced during manufacturing. A review of gear overhaul records indicated that other pins manufactured by the same supplier had similar signs of heat damage, suspected to have been caused by abusive chrome grinding. This evidence suggests that the heat damage occurred during manufacturing, so it is possible that other airplanes can have aft trunnion pins with similar heat damage. Boeing Multi-Operator Message (MOM) MOM-MOM-15-0303-01B is related to this service bulletin. Operators that have identified the serial number in order to respond to the questions asked in this MOM do not need to do PART 1 of the work instructions. Boeing Service Related Problem (SRP)777-SRP-32-0202is related to this service bulletin. Boeing Fleet Team Digest (FTD)777 FTD 32-14005is related to this service bulletin. Revision 1 is sent to remove airplane line numbers 1331 through 1343 from the effectivity. These airplanes were or will be delivered after the Original Issue date of this service bulletin (SB). The SB is revised to reflect type design at the time of delivery. However, it is understood that the FAA Airworthiness Directive related to this SB will be applicable to all Boeing 777 airplanes due to concerns about rotable parts.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 17of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**The data given in Information Notice 777-32A0103 IN 01 is included in this revision.

**D. Description**  Do a records check or Detailed Inspection of the Main Landing Gear Aft Trunnion Pins to identify the serial number and to look for a "BASE METAL INSPECTED" marking. If the serial number begins with "EGL" or "MAL", and a "BASE METAL INSPECTED" marking is not found, replace the aft trunnion pin. If the serial number does not begin with "EGL" or "MAL", or a "BASE METAL INSPECTED" marking is found, no more work is necessary. Effects of this Revision on airplanes on which Original Issue was previously done: None The work in this service bulletin is done in the maintenance zone(s) given below. **Group 1: Affected Maintenance Zones**  **Zone Model**  143, 144, 731, 735, 741, 745 777-200, 777-300 **Group 2: Affected Maintenance Zones**  **Zone Model**  143, 144, 731, 735, 741, 745 777-200LR, 777-300ER, 777F
**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 Multi-Operator Message (MOM) MOM-MOM-15-0303-01B is related to this service bulletin. Operators that have identified the serial number in order to respond to the questions asked in this MOM do not need to do PART 1 of the work instructions. A logic diagram showing compliance tasks and compliance times is included as an aid in Appendix A. Do the required actions in accordance with Paragraph 3. Accomplishment Instructions.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 18of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT Table 1: AFT TRUNNION PIN IDENTIFICATION AND REPLACEMENT**  **Repeat Interval (Not to Exceed)**  **Compliance Time Action**  **Condition**

- Within 36 months after the original issue date of this service bulletin. Do PART 1: AFT TRUNNION PIN IDENTIFICATION. All airplanes

- Within 36 months after the original issue date of this service bulletin. Do PART 2: AFT TRUNNION PIN REPLACEMENT.(a) CONDITION 1: AFT TRUNNION PIN SERIAL NUMBER BEGINNING WITH "EGL" OR "MAL"FOUND AND AFT TRUNNION PIN IS NOT PERMANENTLY MARKED, "BASE METAL INSPECTED".

- - No more work is necessary.(a) CONDITION 2: AFT TRUNNION PIN SERIAL NUMBER BEGINNING WITH "EGL" OR "MAL"FOUND AND AFT TRUNNION PIN IS FOUND PERMANENTLY MARKED, "BASE METAL INSPECTED".

- - No more work is necessary.(a) CONDITION 3: NO AFT TRUNNION PIN SERIAL NUMBER BEGINNING WITH "EGL" OR "MAL" FOUND. (a) This is a terminating action for 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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 19of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT 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
• Time to find the tools. **NOTE:** For PART 1, OPTION 1: RECORDS CHECK, the number of persons and time necessary to do the records check will be different for each operator. **PART 1, OPTION 2: DETAILED INSPECTION Elapsed Hours**  **Task Hours Number of Persons**  **Task** 0.50 0.50 1 Open Access 0.10 0.10 1 FIGURE 1 0.10 0.10 1 FIGURE 2 0.50 0.50 1 Close Access 1.20 1.20 TOTAL FOR EACH AIRPLANE **Group 1: PART 2: AFT TRUNNION PIN REPLACEMENT**  **Elapsed Hours Task Hours**  **Number of Persons Task**  2.60 13.00 5 Open Access 4.00 8.00 2 FIGURE 3or FIGURE 4 2.60 13.00 5 Close Access 9.20 34.00 TOTAL FOR EACH AFT TRUNNION PIN **Group 2: PART 2: AFT TRUNNION PIN REPLACEMENT**  **Elapsed Hours Task Hours**  **Number of Persons Task**  2.60 13.00 5 Open Access 4.00 8.00 2 FIGURE 5or FIGURE 6 2.60 13.00 5 Close Access 9.20 34.00 TOTAL FOR EACH AFT TRUNNION PIN

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 20of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT H.**  **Weight and Balance Changes** None. **I. Electrical Load Data**  Not changed. **J. References**  1. Existing Data:

a. Boeing Multi-Operator Message (MOM) MOM-MOM-15-0303-01B b. Boeing Service Related Problem (SRP)777-SRP-32-0202

c. Component Maintenance Manual (CMM)32-11-03,32-11-65 d. Service Bulletin Index D624W001

e. 777 Aircraft Maintenance Manual (AMM)32-00-15,32-00-30,32-11-01 f. 777 Fleet Team Digest (FTD)32-14005 2. Data Supplied with this Service Bulletin: None. 3. Installation Drawings Used in the Preparation of this Service Bulletin: None **K. Publications Affected**  1. Publications: **Chapter-Section Publication**  32-11 777 Illustrated Parts Catalog 32-11 Component Maintenance Manual
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 does not affect FCS, therefore DTIs are not necessary. **L. Interchangeability and Intermixability of Parts**  Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability information.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 21of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT M.**  **Software Accomplishment Summary**

Not affected.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 22of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT 2. MATERIAL INFORMATION**  **A. Material - Price and Availability**  Boeing can supply the parts shown inParagraph 2.C., Parts Necessary for Each Airplane. Operators are encouraged to share schedule requirements with Boeing for incorporation of the service bulletin. The parts are subject to the terms and conditions of the Boeing standard purchase order acknowledgment. Prices are in United States Dollars. Terms: Net 30 days. Reference this service bulletin and submit your purchase order by one of these methods: 1. Order on-line via ATA Spec 2000 or The Boeing PART Page 2. Fax to (206) 662-7145 **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 as of the original issue** **date of this Ser vice Bulletin (US**  **Dollars) ROLT as of the**  **original issue date of this Ser** **vice Bulletin (Cal endar Days)**  **QTY Date**  **Name Part Number** 

$5,291.00

- 12 September 17, 2015 Aft Trunnion Pin Assembly 161W1301-3

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 23of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT 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 as of**  **the original issue date of this Ser**  **vice Bulletin (US Dollars)**  **ROLT as of the original issue** **date of this Ser vice Bulletin (Cal**  **endar Days) QTY**  **Date Name**  **Part Number**

$5,291.00 391 8 November 16, 2015 Aft Trunnion Pin Assembly 161W1301-9 8 January 15, 2016 260 January 22, 2016 8 February 15, 2016 8 March 15, 2016 40 April 13, 2016 8 April 15, 2016 50 May 11, 2016 10 May 16, 2016 50 June 13, 2016 10 June 15, 2016 50 July 13, 2016 10 July 15, 2016 10 August 11, 2016 10 August 15, 2016 10 September 13, 2016 6 September 15, 2016 10 October 12, 2016 10 November 10, 2016 10 December 13, 2016 Operators are encouraged to complete the survey provided inAPPENDIX Cof this service bulletin to help Boeing predict the quantity and timing of the Boeing Supplied Kits/Parts. **B. Industry Support Information**  Boeing warranty remedies are available for 777 airplanes in warranty as of November 17, 2014. For inspection labor task hour reimbursement for airplanes in warranty as of that date, send a warranty claim to Boeing Fleet Support Contracts - Warranty. If the condition described in this service bulletin is found during the inspection for airplanes in warranty as of that date and additional task hours and parts are required, send a warranty claim to Boeing Fleet Support Contracts - Warranty.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 24of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**Additionally, Boeing has elected to extend a business consideration for out-of-warranty airplanes with line numbers 1 through 504 and line number 784 (Business Consideration Airplanes). If the condition described in this service bulletin is found during the inspection of Business Consideration Airplanes and Part Number 161W1301-7 or 161W1301-9 is required, send a warranty claim to Boeing Fleet Support Contracts - Warrantyto receive the aforementioned parts at no-charge

. The warranty remedies and Business Consideration will expire eight years from the original release date of this service bulletin. **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

. **Group 1: Notes**  **Existing Part Number Name**  **QTY New Part Number**  (a) 161W0004-3, 161W1301-1, 161W1301-3, 161W1301-5, 161W1301-7 Aft Trunnion Pin Assembly 2(b) 161W1301-7(161W1301-9 optional)
(a) Main Landing Gear Aft Trunnion Pin Assembly part number 161W1301-9 is designed for heavier gross weight airplanes (Group 2) and therefore can be substituted for part numbers 161W1301-1, -3, -5, -7, and 161W0004-3, which were installed on Group 1 airplanes. (b) Quantity of Aft Trunnion pins depends on number requiring replacement. One aft trunnion pin is necessary for each main landing gear. **Group 2: Notes**  **Existing Part Number Name**  **QTY New Part Number**  161W1301-9 Aft Trunnion Pin Assembly 2(a) 161W1301-9 (a) Quantity of Aft Trunnion Pins depends on number requiring replacement. One aft trunnion pin is necessary for each main landing gear.
2. Parts and Materials Supplied by the Operator None. 3. Parts Modified and Reidentified None. 4. Parts Removed and Not Replaced None. **D. Parts Necessary to Change Spares**  None

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 25of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT 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 11, 2015 777-32A0103 Revision 1: December 10, 2015 26of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT 3. ACCOMPLISHMENT INSTRUCTIONS**  **A. GENERAL INFORMATION**  **CAUTION:** KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL

PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL, METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR OTHER ELECTRICAL DAMAGE. **NOTE:** 1. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for

definition of the acronyms. 2. Obey all of the warnings and cautions given in the specified manual sections. 3. Unless shown differently, these dimensions and tolerances are used:

– Linear dimensions are in inches

– Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus or minus 0.03 inch

– Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch

– Angular tolerance is plus or minus 2 degrees

– Hole dimensions for standard solid rivets and fasteners are in Structural Repair Manual (SRM) Chapter 51

– Torque Values:

— Values for structural fasteners are given in 777 Structural Repair Manual, Chapter 51.

— Values for airframe maintenance tasks are included in Chapter 20 of 777 Aircraft Maintenance Manual (AMM).

— Values for electrical maintenance tasks are included in Chapter 20 of Standard Wiring Practices Manual (SWPM).

— Values for engine maintenance tasks are included in Chapter 70 of 777 Aircraft Maintenance Manual (AMM).

— Non-standard torque values for maintenance tasks are included in the applicable installation step.

4. Use the approved fastener, process and material substitutions in accordance with

SRM Chapter 51. 5. A Detailed Inspection is defined as: An intensive examination of a specific item,

installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors, magnifying lenses, etc. may be necessary. Surface cleaning and elaborate procedures may be required. 6. 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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 27of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**7. The instructions in Paragraph 3.B., Work Instructions and the figures can include operation of tools or test equipment. Boeing Engineering Tool Drawings, the Illustrated Tool and Equipment Manual, and the Special Tool and Ground Handling Drawing Index contain data on versions of the tools or test equipment that you can use. It is permitted to use replaced tools. It is not permitted to use superseded tools. 8. If it is necessary to remove more parts for access, you can remove those parts. If you can get access without removing identified parts, it is not necessary to remove all of the identified parts. Jacking and shoring limitations must be observed. 9. Where the work instructions include installation of a kept part, a new or serviceable

part with the same part number can be installed as an alternative to the kept part. 10. This service bulletin includes functional test procedures for the systems changed by this service bulletin. More functional tests can possibly be necessary in accordance with standard maintenance practices because of interruption to other airplane systems. 11. If shading is used, shaded areas in Figures are to separate the non-critical and non-authoritative information from the critical and authoritative information. 12. Use of colors in Figures is based on guidance from the ATA e-Business Program (ATA) iSpec 2200. 13. When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When more than one ACTION is given for a CONDITION number or an OPTION number, do all of the ACTION numbers for that CONDITION number or OPTION number. 14. The compliance times for the actions in Paragraph 3.B., WORK INSTRUCTIONS are in Paragraph 1.E., Compliance

. 15. Some steps in the Work Instructions are labeled as Required for Compliance (RC). If this service bulletin is mandated by an Airworthiness Directive (AD), then the steps labeled as RC, including sub-steps under an RC step and any figures identified in an RC step, must be done to comply with the AD. An Alternative Method of Compliance (AMOC) is required for any deviations to RC steps, including sub-steps and identified figures. Steps not labeled as RC may be deviated from using accepted methods in accordance with the operator's maintenance or inspection program without obtaining approval of an AMOC. This is provided that the RC steps, including sub-steps and identified figures, can still be done as specified, and the airplane can be put back in an airworthy condition. **B. WORK INSTRUCTIONS**  1. Do PART 1: AFT TRUNNION PIN IDENTIFICATION. **NOTE:** Operators that have identified the serial number in order to respond to the questions asked in MOM-MOM-15-0303-01B do not need to do this step, provided that it can be positively determined that the MLG aft trunnion pin has not been replaced since accomplishing the actions specified in MOM-MOM-15-0303-01B. Continue with Step 2 below. If the MLG aft trunnion pin has been replaced since accomplishing the actions specified in MOM-MOM-15-0303-01B, do PART 1: AFT TRUNNION PIN IDENTIFICATION.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 28of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**2. Do the applicable step for each aft trunnion pin:

a. CONDITION 1: AFT TRUNNION PIN SERIAL NUMBER BEGINNING WITH "EGL" OR "MAL" FOUND AND AFT TRUNNION PIN IS NOT PERMANENTLY MARKED, "BASE METAL INSPECTED". (1) Do PART 2: AFT TRUNNION PIN REPLACEMENT. b. CONDITION 2: AFT TRUNNION PIN SERIAL NUMBER BEGINNING WITH "EGL" OR "MAL" FOUND AND AFT TRUNNION PIN IS FOUND PERMANENTLY MARKED, "BASE METAL INSPECTED". (1) No more work is necessary.

c. CONDITION 3: NO AFT TRUNNION PIN SERIAL NUMBER BEGINNING WITH "EGL" OR "MAL" FOUND. (1) No more work is necessary. 3. Put the airplane back to a serviceable condition. **PART 1: AFT TRUNNION PIN IDENTIFICATION** 1. Do one of the options below:

a. OPTION 1: RECORDS CHECK (1) Records check of Spare Aft Trunnion Pins: (a) Do a records check of all aft trunnion pins in spares inventory to determine if any serial number begins with "EGL" or "MAL", and if the aft trunnion pin is permanently marked, "BASE METAL INSPECTED". (2) Records check of Installed Aft Trunnion Pins: (a) RC - Do a records check to find if an aft trunnion pin with a serial number that begins with "EGL" or "MAL" is installed in either of the two (2) aft trunnion pin locations on the airplane, and if the aft trunnion pin is permanently marked, "BASE METAL INSPECTED". **NOTE:** Records to be checked include, but are not limited to, the Aircraft Readiness

Log (ARL), Safe Life Part Record Keeping System, and maintenance records. b. OPTION 2: DETAILED INSPECTION (1) Inspection of Spare Aft Trunnion Pins: (a) Do a Detailed Inspection of all aft trunnion pins in spares inventory to determine if any serial number begins with "EGL" or "MAL" and if the aft trunnion pin is permanently marked, "BASE METAL INSPECTED". (2) Inspection of Installed Aft Trunnion Pins:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 29of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**(a) If downlock pins are not installed in the nose and main landing gear, install downlock pins. Refer to777 AMM 32-00-30as an accepted procedure. (b) Install the landing gear door safety pins. Refer to777 AMM 32-00-15as an accepted procedure. (c) Open access to the aft trunnion pin. Refer to777 AMM 32-11-01as an accepted procedure. (d) RC - Do a Detailed Inspection of the main landing gear aft trunnion pin in accordance with the figures below:

– Left side: Use FIGURE 1

.

– Right side: Use FIGURE 2

. **PART 2: AFT TRUNNION PIN REPLACEMENT CAUTION:**  DO NOT INSTALL AN AFT TRUNNION PIN WITH A SERIAL NUMBER THAT BEGINS

WITH "EGL" OR "MAL" UNLESS THAT AFT TRUNNION PIN RECEIVES A DETAILED INSPECTION AND REPAIR IN ACCORDANCE WITHCMM 32-11-03, "REPAIR 16-2" TEMPORARY REVISION 32-7004, DATED MARCH 01, 2015 OR LATER BOEING APPROVED REVISIONS THAT ARE PUBLISHED ON MYBOEINGFLEET; OR IN ACCORDANCE WITHCMM 32-11-65, "REPAIR 3-2" TEMPORARY REVISION 32-7005, DATED MARCH 01, 2015 OR LATER BOEING APPROVED REVISIONS THAT ARE PUBLISHED ON MYBOEINGFLEET. INSPECTED AND REPAIRED AFT TRUNNION PINS WILL BE MARKED "BASE METAL INSPECTED". 1. Disposition of Spare Aft Trunnion Pins:

a. Discard affected spare aft trunnion pins or repair them in accordance with the applicable CMM below: (1) Aft trunnion pins 161W0004-3, 161W1301-1, 161W1301-3, 161W1301-5, and 161W1301-7: useCMM 32-11-03, "Repair 16-2" Temporary Revision 32-7004, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet. (2) Aft trunnion pin 161W1301-9: useCMM 32-11-65, "Repair 3-2" Temporary Revision 32-7005, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet. 2. Replacement of Installed Aft Trunnion Pins:

a. RC - Replace the aft trunnion pin with a new or serviceable aft trunnion pin in accordance with the applicable figure below: (1) **Group 1:**

– Left side: Use FIGURE 3

.

– Right side: Use FIGURE 4

. (2) **Group 2:**

– Left side: Use FIGURE 5

.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 30of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**– Right side: Use FIGURE 6

. **NOTE:** Aft trunnion pins with serial numbers that begin with "EGL" and "MAL" are serviceable if inspected, confirmed to be free of heat damage and cracks, and permanently marked "BASE METAL INSPECTED" in accordance withCMM 32-11-03, "Repair 16-2" Temporary Revision 32-7004, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet; or in accordance withCMM 32-11-65, "Repair 3-2" Temporary Revision 32-7005, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1: December 10, 2015 31of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT FIGURE 1:** **LEFT MAIN LANDING GEAR AFT TRUNNION PIN - DETAILED INSPECTION (SHEET 1 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1 December 10, 2015 32of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**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 Data Qty**  **Identification Name**  **Task Step**  (a) (b) 1 161W1301-9(161W0004-3, 161W1301- 1, 161W1301-3, 161W1301-5, 161W1301- 7 optional) Aft Trunnion Pin Assembly Inspect 1
(a) Do a Detailed Inspection to determine if the aft trunnion pin serial number begins with "EGL" or "MAL" and if the aft trunnion pin is permanently marked, "BASE METAL INSPECTED". (b) The serial number is located on the aft end of the aft trunnion pin.

**FIGURE 1: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - DETAILED INSPECTION**  **(SHEET 2 OF 2)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1December 10, 2015 33of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT FIGURE 2:** **RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - DETAILED INSPECTION (SHEET 1 OF 2)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1 December 10, 2015 34of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**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 Data Qty**  **Identification Name**  **Task Step**  (a) (b) 1 161W1301-9(161W0004-3, 161W1301- 1, 161W1301-3, 161W1301-5, 161W1301- 7 optional) Aft Trunnion Pin Assembly Inspect 1
(a) Do a Detailed Inspection to determine if the aft trunnion pin serial number begins with "EGL" or "MAL" and if the aft trunnion pin is permanently marked, "BASE METAL INSPECTED". (b) The serial number is located on the aft end of the aft trunnion pin.

**FIGURE 2: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - DETAILED INSPECTION**  **(SHEET 2 OF 2)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1December 10, 2015 35of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT This Figure applies only to: Group 1.** 

**FIGURE 3: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 1 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1 December 10, 2015 36of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**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 Data Qty**  **Identification Name**  **Task Step**  (a) (b) 1 161W1301-7 (161W0004-3, 161W1301-1, 161W1301-3, 161W1301-5 optional) Aft Trunnion Pin Assembly Remove 1

(a) (c) (d) 1 161W1301-7 (161W1301-9 optional) Aft Trunnion Pin Assembly Install (New) 2

**FIGURE 3: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 2 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1December 10, 2015 37of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (a) Refer to777 AMM 32-11-01as an accepted procedure. (b) A removed aft trunnion pin may be made serviceable. Repair, inspect, and permanently mark the removed aft trunnion pin assembly in accordance withCMM 32-11-03, "Repair 16-2" Temporary Revision 32-7004, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet. (c) A serviceable aft trunnion pin can be installed as an option to a new aft trunnion pin. Aft trunnion pins with serial numbers that do not begin with "EGL" or "MAL" are serviceable. Aft trunnion pins with serial numbers that begin with "EGL" and "MAL" are serviceable if inspected, confirmed to be free of heat damage and cracks, and permanently marked, "BASE METAL INSPECTED" in accordance withCMM 32-11-03, "Repair 16-2" Temporary Revision 32-7004, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet. (d) Other part numbers may be installed. Refer toAPPENDIX B

.

**FIGURE 3: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 3 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1 December 10, 2015 38of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT This Figure applies only to: Group 1.** 

**FIGURE 4: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 1 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1December 10, 2015 39of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**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 Data Qty**  **Identification Name**  **Task Step**  (a) (b) 1 161W1301-7 (161W0004-3, 161W1301-1, 161W1301-3, 161W1301-5 optional) Aft Trunnion Pin Assembly Remove 1

(a) (c) (d) 1 161W1301-7 (161W1301-9 optional) Aft Trunnion Pin Assembly Install (New) 2 (a) Refer to777 AMM 32-11-01as an accepted procedure.

**FIGURE 4: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 2 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1 December 10, 2015 40of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (b) A removed aft trunnion pin may be made serviceable. Repair, inspect, and permanently mark the removed aft trunnion pin assembly in accordance withCMM 32-11-03, "Repair 16-2" Temporary Revision 32-7004, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet. (c) A serviceable aft trunnion pin can be installed as an option to a new aft trunnion pin. Aft trunnion pins with serial numbers that do not begin with "EGL" or "MAL" are serviceable. Aft trunnion pins with serial numbers that begin with "EGL" and "MAL" are serviceable if inspected, confirmed to be free of heat damage and cracks, and permanently marked, "BASE METAL INSPECTED" in accordance withCMM 32-11-03, "Repair 16-2" Temporary Revision 32-7004, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet. (d) Other part numbers may be installed. Refer toAPPENDIX B

.

**FIGURE 4: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 3 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1December 10, 2015 41of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT This Figure applies only to: Group 2.** 

**FIGURE 5: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 1 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1 December 10, 2015 42of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**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 Data Qty**  **Identification Name**  **Task Step**  (a) (b) 1 161W1301-9 Aft Trunnion Pin Assembly Remove 1 (a) (c) 1 161W1301-9 Aft Trunnion Pin Assembly Install (New) 2 (a) Refer to777 AMM 32-11-01as an accepted procedure. (b) A removed aft trunnion pin may be made serviceable. Repair, inspect, and permanently mark the removed aft trunnion pin assembly in accordance withCMM 32-11-65, "Repair 3-2" Temporary Revision 32-7005, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet.

**FIGURE 5: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 2 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1December 10, 2015 43of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (c) A serviceable aft trunnion pin can be installed as an option to a new aft trunnion pin. Aft trunnion pins with serial numbers that do not begin with "EGL" or "MAL" are serviceable. Aft trunnion pins with serial numbers that begin with "EGL" and "MAL" are serviceable if inspected, confirmed to be free of heat damage and cracks, and permanently marked, "BASE METAL INSPECTED" in accordance withCMM 32-11-65, "Repair 3-2" Temporary Revision 32-7005, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet.

**FIGURE 5: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 3 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1 December 10, 2015 44of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT This Figure applies only to: Group 2.** 

**FIGURE 6: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 1 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1December 10, 2015 45of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**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 Data Qty**  **Identification Name**  **Task Step**  (a) (b) 1 161W1301-9 Aft Trunnion Pin Assembly Remove 1 (a) (c) 1 161W1301-9 Aft Trunnion Pin Assembly Install (New) 2 (a) Refer to777 AMM 32-11-01as an accepted procedure. (b) A removed aft trunnion pin may be made serviceable. Repair, inspect, and permanently mark the removed aft trunnion pin assembly in accordance withCMM 32-11-65, "Repair 3-2" Temporary Revision 32-7005, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet.

**FIGURE 6: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 2 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1 December 10, 2015 46of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (c) A serviceable aft trunnion pin can be installed as an option to a new aft trunnion pin. Aft trunnion pins with serial numbers that do not begin with "EGL" or "MAL" are serviceable. Aft trunnion pins with serial numbers that begin with "EGL" and "MAL" are serviceable if inspected, confirmed to be free of heat damage and cracks, and permanently marked, "BASE METAL INSPECTED" in accordance withCMM 32-11-65, "Repair 3-2" Temporary Revision 32-7005, dated March 01, 2015 or later Boeing approved revisions that are published on MyBoeingFleet.

**FIGURE 6: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT**  **(SHEET 3 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1December 10, 2015 47of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**Logic diagrams are provided as an aid only. Information contained inParagraph 1.E., Complianceis the primary

source for compliance times. Information contained in Paragraph 3.B., Work Instructionsis the primary source for tasks required for compliance.

**APPENDIX A: LOGIC DIAGRAM**  **(SHEET 1 OF 2)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1 December 10, 2015 48of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**1. The table below gives the description for the parts and conditions called out in the logic diagrams. **Description Title**  AFT TRUNNION PIN IDENTIFICATION PART 1 AFT TRUNNION PIN REPLACEMENT PART 2 AFT TRUNNION PIN SERIAL NUMBER BEGINNING WITH "EGL" OR "MAL" FOUND AND AFT TRUNNION PIN IS NOT PERMANENTLY MARKED, "BASE METAL INSPECTED". CONDITION 1

AFT TRUNNION PIN SERIAL NUMBER BEGINNING WITH "EGL" OR "MAL" FOUND AND AFT TRUNNION PIN IS FOUND PERMANENTLY MARKED, "BASE METAL INSPECTED". CONDITION 2

NO AFT TRUNNION PIN SERIAL NUMBER BEGINNING WITH "EGL" OR "MAL" FOUND. CONDITION 3 NOTE: Boeing Multi-Operator Message (MOM) MOM-MOM-15-0303-01B is related to this service bulletin. Operators that have identified the serial number in order to respond to the questions asked in this MOM do not need to do PART 1 of the work instructions.

**APPENDIX A: LOGIC DIAGRAM**  **(SHEET 2 OF 2)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1December 10, 2015 49of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT Acceptable Aft Trunnion Pin Assemblies**  **Maximum Taxi Gross Weight**  **(Reference Only) Airplane Minor**  **Model (Boeing Designation)**  **Airplane Minor Model (Type Certificate Data**  **Sheet)** 161W0004-3, 161W1301-1, 161W1301-3, 161W1301-5, 161W1301-7, 161W1301-9 547,000 lbs 777-200 777-200 161W0004-3, 161W1301-3, 161W1301-5, 161W1301-7, 161W1301-9 652,000 lbs 777-200ER 161W1301-7, 161W1301-9

658,000 lbs 777-200ER/IGW 161W1301-9

768,800 lbs 777-200LR 777-200LR 161W1301-7, 161W1301-9 662,000 lbs 777-300 777-300 161W1301-9 777,000 lbs 777-300ER 777-300ER 161W1301-9 768,800 lbs 777F 777F

**APPENDIX B: ACCEPTABLE AFT TRUNNION PIN ASSEMBLY PART NUMBERS**  **(SHEET 1 OF 1)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1 December 10, 2015 50of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT APPENDIX C:** **PART DEMAND INTENT SURVEY (SHEET 1 OF 1)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 11, 2015 777-32A0103 Revision 1December 10, 2015 51of51 **BOEING SERVICE BULLETIN 777-32A0103 ALERT**  **ALERT**