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Commercial Airplanes 777 Service Bulletin Number: 777-32-0085 Original Issue: April 14, 2011 ATA System: 3200 SUBJECT: LANDING GEAR - Main Landing Gear - Center Axle and Pivot Joint Configuration Change Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 730-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2011 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.
This document includes proprietary information owned by The Boeing Company and/or one or more third parties.
Treatment of the document and the information it contains is governed by contract with Boeing. For more information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and the Boeing livery 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.
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Original Issue: April 14, 2011 777-32-0085 1 of 38
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 1 3 B. Concurrent Requirements ...................................... 1 3 C. Reason ................................................ 1 3 D. Description .............................................. 1 4 E. Compliance .............................................. 1 5 F. Approval ............................................... 1 5 G. Manpower .............................................. 1 5 H. Weight and Balance Changes .................................... 1 6 I. Electrical Load Data ......................................... 1 6 J. References .............................................. 1 6
1. Existing Data .......................................... 1 6
2. Data supplied with this Service Bulletin ............................ 1 6
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 1 6 K. Publications Affected ........................................ 1 7 L. Interchangeability and Intermixability of Parts ........................... 1 7
2. MATERIAL INFORMATION ........................................ 1 9 A. Material - Price and Availability ................................... 1 9 B. Industry Support Information .................................... 2 0 C. Parts Necessary For Each Airplane ................................. 2 0
1. Kits/Parts ............................................ 2 0
2. Parts and Materials Supplied by the Operator ........................ 2 0
3. Parts Modified and Reidentified ................................ 2 1
4. Parts Removed and Not Replaced .............................. 2 1 D. Parts Necessary to Change Spares ................................. 2 1 E. Special Tooling - Price and Availability ............................... 2 1 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 2
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 3 A. GENERAL INFORMATION ..................................... 2 3 B. WORK INSTRUCTIONS ....................................... 2 3 FIGURE 1: CENTER AXLE CHANGE ................................... 2 5 FIGURE 2: INNER CYLINDER CHANGE ................................. 2 7 APPENDIX A: PART MARKING REIDENTIFICATION TABLE ........................ 3 0 APPENDIX B: CENTER AXLE ASSEMBLY AND INNER CYLINDER ASSEMBLY INTERCHANGEABILITY BASED ON AIRPLANE MINOR MODEL ........................... 3 8
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Commercial Airplanes 777 Service Bulletin SummaryNumber: 777-32-0085Original Issue: April 14, 2011 ATA System: 3200 SUBJECT: LANDING GEAR - Main Landing Gear - Center Axle and Pivot Joint Configuration Change
CONCURRENT REQUIREMENTS Refer to Paragraph 1.B., Concurrent Requirements.
BACKGROUND Accomplishment of this service bulletin will change the configuration of the main landing gear (MLG) pivot joint to reduce the amount of heat generated in the center axle and the shock strut inner cylinder lugs during takeoff and landing. High levels of heat in the pivot joint can result in damage to the center axle and inner cylinder lugs which could result in significant manpower and airplane downtime to repair.
During MLG overhaul, 39 center axles have been found with cracks or heat damage at the inner cylinder/truck beam pivot joint location. There have been no reports of a center axle fracture. There have been no reports of heat damage in the inner cylinder pivot bores. Heat damage and cracks were found at the pivot joint location which is caused by the truck pitching motion during normal airplane operations. Cracks were found in areas common to the inner cylinder pivot bushings where heat damage had occurred.
This service bulletin provides the instructions to change the configuration of the center axle assemblies and shock strut inner cylinder assemblies of the MLGs to reduce friction in the pivot joint. Reduced friction in the pivot joint will lead to a lower amount of heat in the pivot joint which will extend the service life of the parts.
Incorporation of the changes in accordance with this service bulletin and a final, one-time inspection of the pivot joint in accordance with Boeing Service Bulletin (SB) 777-32A0082, Part 2 is terminating action to the repeat inspections of SB 777-32A0082, Part 2.
Incorporation of the changes in accordance with this service bulletin and incorporation of the lubrication requirements in accordance with 777 MPD Section 9, 32-CMR-01 is terminating action to the repeat lubrications of SB 777-32A0082, Part 1.
Boeing Service Related Problem (SRP) 777-SRP-32-0159 is related to this service bulletin.
Boeing Service Letter (SL) 777-SL-32-059 is related to this service bulletin.
ACTION (PRR 62777-70S) Get access to the left and right MLG wheel wells. Remove the landing gear center axles of both MLGs. Replace the center axles or change the center axles by polishing to the new configuration. Remove the inner cylinder bushings and install new inner cylinder bushings. Part mark the MLG components and assemblies. Lubricate the pivot joint with new grease.
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Update maintenance program in accordance with 777 MPD Section 9, 32-CMR-01 to do periodic lubrications of the MLG pivot joint.
EFFECTIVITY 777-200, -300, -200LR, -300ER and 777F Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
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 given in this service bulletin mandatory.
No compliance time is given.
Boeing recommends this service bulletin be done to introduce improvements.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
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Original Issue: April 14, 2011 777-32-0085 6 of 38 BOEING SERVICE BULLETIN 777-32-0085
BOEING SERVICE BULLETIN 777-32-0085 REMOVE THE CENTER AXLES OF BOTH MLGS. REPLACE
THE CENTER AXLES OR CHANGE THE CENTER AXLES BY POLISHING TO THE NEW CONFIGURATION. REMOVE THE
INNER CYLINDER BUSHINGS AND INSTALL NEW INNER CYLINDER BUSHINGS. PART MARK THE MLG COMPONENTS AND ASSEMBLIES. LUBRICATE THE PIVOT JOINT WITH NEW GREASE 1999985 Original Issue: April 14, 2011 777-32-0085
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Commercial Airplanes 777 Service Bulletin Number: 777-32-0085 Original Issue: April 14, 2011 ATA System: 3200 SUBJECT: LANDING GEAR - Main Landing Gear - Center Axle and Pivot Joint Configuration Change
1. PLANNING INFORMATION A. Effectivity
1. Airplanes Refer to Service Bulletin Index Document D624W001 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for the airplane(s) shown below. An equivalent change is on subsequent production airplanes. Refer to PRR 62777-70S for data about this change.
DESCRIPTIONCONFIGURATIONGROUP 777-200LR, -300ER and 777F Airplanes with line number 423- 914.-1 777-200 and -300 Airplanes with line number 1- 868.-2 Airplane Models:
777-200, 777-200LR, 777-300, 777-300ER, 777F GroupVariable Number 2WA001 - WA017 2WA076 - WA080 2WA086 - WA093 2WA101 - WA104 2WA116 - WA119 2WA131 - WA137 2WA171 - WA175 2WA196 - WA198 2WA206 - WA212
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GroupVariable Number 2WA221 - WA223 2WA231 - WA232 2WA241 - WA250 2WA261 - WA266 2WA281 - WA283 2WA301 - WA304 2WB001 - WB021 2WB031 - WB046 2WB051 - WB088 2WB101 - WB106 2WB121 - WB125 2WB131 - WB148 2WB151 - WB155 2WB161 - WB177 2WB181 - WB194 2WB201 - WB215 2WB231 - WB247 2WB271 - WB273 2WB276 - WB286 2WB291 - WB302 2WB306 - WB307 2WB311 - WB337 2WB341 - WB342 2WB366 - WB368 2WB371 - WB388 2WB406 2WB411 - WB413 2WB416 - WB439 2WB446 - WB453 2WB476 2WB481 - WB484 2WB501 - WB512 2WB531 - WB537
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GroupVariable Number 2WB551 - WB554 2WB591 - WB597 2WB601 - WB606 2WB611 - WB622 2WB631 - WB638 2WB646 - WB649 2WC051 - WC073 2WC101 - WC104 2WC111 - WC120 2WC221 - WC224 2WC241 - WC243 2WC281 - WC290 2WC301 - WC308 2WC361 - WC364 2WC371 - WC374 2WC381 - WC395 2WC441 2WC446 - WC449 2WC456 - WC459 2WC486 - WC493 2WC506 - WC508 2WC521 - WC522 2WC531 - WC536 2WC546 - WC548 2WC556 2WC566 - WC567 2WC571 - WC574 2WC581 1WD001 - WD002 1WD011 - WD018 1WD031 - WD036 1WD046 - WD055 1WD066 - WD075
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GroupVariable Number 1WD081 - WD088 1WD091 1WD096 1WD101 - WD103 1WD501 - WD513 1WD521 - WD541 1WD546 - WD554 1WD561 - WD573 1WD581 - WD599 1WD606 - WD609 1WD621 - WD632 1WD651 - WD665 1WD671 - WD676 1WD691 - WD709 1WD741 - WD752 1WD761 - WD771 1WD786 - WD788 1WD796 - WD813 1WD826 - WD837 1WD846 - WD861 1WD871 - WD883 1WD911 - WD914 1WD921 - WD922 1WD936 - WD939 1WD946 - WD951 1WD966 - WD970 1WD981 - WD982 1WD986 - WD987 1WD996 1WE001 - WE004 1WE011 - WE012 1WE021 - WE024 1WE031
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