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.

ECCN: 9E991

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Unpublished Work.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

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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

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ALERT ALERT
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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.

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REVISION HISTORY

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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-32-0202 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 777 FTD 32-14005 is related to this service bulletin.

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This table is provided to operators for planning purposes only. Refer to the applicable sections for more

information.

Planning Data Affected Reference

Spares Affected Yes Paragraph 1.A.2., Spares Affected

Paragraph 1.E., Compliance and Paragraph

1.F., Approval

AD Related Yes

Weight and Balance Change No Paragraph 1.H., Weight and Balance Changes

Electrical Load Changed No Paragraph 1.I., Electrical Load Data

Publications Affected Yes Paragraph 1.K., Publications Affected

Airplane Flight Operations Affected (Flight Crew No Paragraph 1.K., Publications Affected

Operations Manual and/or FAA Approved Airplane Flight Manual)

Kits/Parts Required Yes Paragraph 2.C.1., Kits/Parts

Paragraph 2.C.2., Parts and Materials Supplied

by the Operator

Operator Supplied Parts/Material No

Paragraph 2.F., Special Tooling Necessary to

do this Service Bulletin

Special Tooling Required No

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 to Paragraph 2.B., Industry Support

Information.

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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 in APPENDIX C of this service bulletin to help Boeing

predict the quantity and timing of the Boeing Supplied Kits/Parts.

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ALERT ALERT
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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 to Service Bulletin Index D624W001 Part 3 for Airplane Variable Number, Line Number, and

Serial Number data.

This service bulletin is applicable to 777 Airplanes, line numbers 1-1330 in 2 Groups. The Variable

Numbers and Group Information for the applicable airplanes is given below.

GROUP CONFIGURATION DESCRIPTION

1 - 777-200 and -300 Airplanes

2 - 777-200LR, -300ER, and 777F Airplanes

Airplane Models:

777-200, 777-200LR, 777-300, 777-300ER, 777F

Variable Number Group

WA001 - WA017 1

WA076 - WA080 1

WA086 - WA093 1

WA101 - WA104 1

WA116 - WA119 1

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Variable Number Group

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 1

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BOEING SERVICE BULLETIN 777-32A0103

ALERT ALERT
Variable Number Group

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 1

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BOEING SERVICE BULLETIN 777-32A0103

ALERT ALERT
Variable Number Group

WC591 - WC595 1

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 2

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BOEING SERVICE BULLETIN 777-32A0103

ALERT ALERT
Variable Number Group

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 2

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BOEING SERVICE BULLETIN 777-32A0103

ALERT ALERT
Variable Number Group

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 2

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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 Instructions for 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-32-0202 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 777 FTD 32-14005 is 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.

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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

Model Zone

777-200, 777-300 143, 144, 731, 735, 741, 745

Group 2:

Affected Maintenance Zones

Model Zone

777-200LR, 777-300ER, 777F 143, 144, 731, 735, 741, 745

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.

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ALERT ALERT
Table 1: AFT TRUNNION PIN IDENTIFICATION AND REPLACEMENT

Repeat Interval

(Not to Exceed)

Condition Action Compliance Time

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".

CONDITION 2: AFT No more work is necessary. (a) - -

TRUNNION PIN SERIAL

NUMBER BEGINNING

WITH "EGL" OR "MAL"

FOUND AND AFT TRUNNION PIN IS FOUND

PERMANENTLY

MARKED, "BASE METAL

INSPECTED".

CONDITION 3: NO AFT No more work is necessary. (a) - -

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.

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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

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.50 0.50

FIGURE 1 1 0.10 0.10

FIGURE 2 1 0.10 0.10

Close Access 1 0.50 0.50

TOTAL FOR EACH AIRPLANE 1.20 1.20

Group 1:

PART 2: AFT TRUNNION PIN REPLACEMENT

Task Number of Persons Task Hours Elapsed Hours

Open Access 5 13.00 2.60

FIGURE 3 or FIGURE 4 2 8.00 4.00

Close Access 5 13.00 2.60

TOTAL FOR EACH AFT TRUNNION PIN 34.00 9.20

Group 2:

PART 2: AFT TRUNNION PIN REPLACEMENT

Task Number of Persons Task Hours Elapsed Hours

Open Access 5 13.00 2.60

FIGURE 5 or FIGURE 6 2 8.00 4.00

Close Access 5 13.00 2.60

TOTAL FOR EACH AFT TRUNNION PIN 34.00 9.20

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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:

Publication Chapter-Section

777 Illustrated Parts Catalog 32-11

Component Maintenance Manual 32-11

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.

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ALERT ALERT
M. Software Accomplishment Summary

Not affected.

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ALERT ALERT
2. MATERIAL INFORMATION

A. Material - Price and Availability

Boeing can supply the parts shown in Paragraph 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 Service Bulletin (US

Dollars)

ROLT as of the

original issue

date of this Service Bulletin (Calendar Days)

Part Number Name Date QTY

Aft Trunnion Pin September 17, 2015 12 - $5,291.00

Assembly

161W1301-3

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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 Service Bulletin (US

Dollars)

ROLT as of the

original issue

date of this Service Bulletin (Calendar Days)

Part Number Name Date QTY

Aft Trunnion Pin November 16, 2015 8 391 $5,291.00

Assembly

161W1301-9

January 15, 2016 8

January 22, 2016 260

February 15, 2016 8

March 15, 2016 8

April 13, 2016 40

April 15, 2016 8

May 11, 2016 50

May 16, 2016 10

June 13, 2016 50

June 15, 2016 10

July 13, 2016 50

July 15, 2016 10

August 11, 2016 10

August 15, 2016 10

September 13, 2016 10

September 15, 2016 6

October 12, 2016 10

November 10, 2016 10

December 13, 2016 10

Operators are encouraged to complete the survey provided in APPENDIX C of 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.

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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 - Warranty to 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:

New Part Number QTY Name Existing Part Number Notes

161W0004-3, 161W1301-1, (a)

161W1301-3, 161W1301-5,

161W1301-7

161W1301-7 (161W1301-9 optional) 2 (b) Aft Trunnion Pin Assembly

(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:

New Part Number QTY Name Existing Part Number Notes

161W1301-9 2 (a) Aft Trunnion Pin Assembly 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

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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.

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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.

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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.

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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:

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ALERT ALERT
(a) If downlock pins are not installed in the nose and main landing gear, install downlock

pins. Refer to 777 AMM 32-00-30 as an accepted procedure.

(b) Install the landing gear door safety pins. Refer to 777 AMM 32-00-15 as an accepted

procedure.

(c) Open access to the aft trunnion pin. Refer to 777 AMM 32-11-01 as 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 WITH CMM 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 WITH CMM 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: use CMM 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: use CMM 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.

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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 with CMM 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 with CMM 32-11-65, "Repair 3-2"

Temporary Revision 32-7005, dated March 01, 2015 or later Boeing approved revisions

that are published on MyBoeingFleet.

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

(SHEET 1 OF 2)

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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.

Step Task Name Identification Qty More Data

161W1301-9 (161W0004-3, 161W1301- 1 (a) (b)

1, 161W1301-3, 161W1301-5, 161W1301-

7 optional)

Aft Trunnion Pin

Assembly

1 Inspect

(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)

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

(SHEET 1 OF 2)

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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.

Step Task Name Identification Qty More Data

161W1301-9 (161W0004-3, 161W1301- 1 (a) (b)

1, 161W1301-3, 161W1301-5, 161W1301-

7 optional)

Aft Trunnion Pin

Assembly

1 Inspect

(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)

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ALERT ALERT
This Figure applies only to: Group 1.

FIGURE 3: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT

(SHEET 1 OF 3)

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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.

Step Task Name Identification Qty More Data

161W1301-7 1 (a) (b)

(161W0004-3,

161W1301-1,

161W1301-3,

161W1301-5 optional)

1 Remove Aft Trunnion Pin Assembly

161W1301-7 1 (a) (c) (d)

(161W1301-9 optional)

2 Install (New) Aft Trunnion Pin Assembly

FIGURE 3: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT

(SHEET 2 OF 3)

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ALERT ALERT
Step Task Name Identification Qty More Data

(a) Refer to 777 AMM 32-11-01 as 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 with CMM 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 with CMM 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 to APPENDIX B.

FIGURE 3: LEFT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT

(SHEET 3 OF 3)

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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)

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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.

Step Task Name Identification Qty More Data

161W1301-7 1 (a) (b)

(161W0004-3,

161W1301-1,

161W1301-3,

161W1301-5 optional)

1 Remove Aft Trunnion Pin Assembly

161W1301-7 1 (a) (c) (d)

(161W1301-9 optional)

2 Install (New) Aft Trunnion Pin Assembly

(a) Refer to 777 AMM 32-11-01 as an accepted procedure.

FIGURE 4: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT

(SHEET 2 OF 3)

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BOEING SERVICE BULLETIN 777-32A0103

ALERT ALERT
Step Task Name Identification Qty More Data

(b) A removed aft trunnion pin may be made serviceable. Repair, inspect, and permanently mark the removed

aft trunnion pin assembly in accordance with CMM 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 with CMM 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 to APPENDIX B.

FIGURE 4: RIGHT MAIN LANDING GEAR AFT TRUNNION PIN - REPLACEMENT

(SHEET 3 OF 3)

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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)

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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.

Step Task Name Identification Qty More Data

1 Remove Aft Trunnion Pin Assembly 161W1301-9 1 (a) (b)

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

(a) Refer to 777 AMM 32-11-01 as 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 with CMM 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)

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BOEING SERVICE BULLETIN 777-32A0103

ALERT ALERT
Step Task Name Identification Qty More Data

(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 with CMM 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)

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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)

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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.

Step Task Name Identification Qty More Data

1 Remove Aft Trunnion Pin Assembly 161W1301-9 1 (a) (b)

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

(a) Refer to 777 AMM 32-11-01 as 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 with CMM 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)

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BOEING SERVICE BULLETIN 777-32A0103

ALERT ALERT
Step Task Name Identification Qty More Data

(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 with CMM 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)

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BOEING SERVICE BULLETIN 777-32A0103

ALERT ALERT
Logic diagrams are provided as an aid only. Information contained in Paragraph 1.E., Compliance is the primary

source for compliance times. Information contained in Paragraph 3.B., Work Instructions is the primary source

for tasks required for compliance.

APPENDIX A: LOGIC DIAGRAM

(SHEET 1 OF 2)

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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.

Title Description

PART 1 AFT TRUNNION PIN IDENTIFICATION

PART 2 AFT TRUNNION PIN REPLACEMENT

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)

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BOEING SERVICE BULLETIN 777-32A0103

ALERT ALERT
Maximum Taxi Acceptable Aft Trunnion Pin Assemblies

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

777-200 777-200 547,000 lbs

161W0004-3, 161W1301-3, 161W1301-5,

161W1301-7, 161W1301-9

777-200ER 652,000 lbs

777-200ER/IGW 658,000 lbs 161W1301-7, 161W1301-9

777-200LR 777-200LR 768,800 lbs 161W1301-9

777-300 777-300 662,000 lbs 161W1301-7, 161W1301-9

777-300ER 777-300ER 777,000 lbs 161W1301-9

777F 777F 768,800 lbs 161W1301-9

APPENDIX B: ACCEPTABLE AFT TRUNNION PIN ASSEMBLY PART NUMBERS

(SHEET 1 OF 1)

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ALERT ALERT
APPENDIX C: PART DEMAND INTENT SURVEY

(SHEET 1 OF 1)

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BOEING SERVICE BULLETIN 777-32A0103

ALERT ALERT