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Commercial Airplanes 777 Service Bulletin ALERT Number: 777-57A0090 Original Issue: August 24, 2011 ATA System: 5754 SUBJECT: WINGS - Landing Gear Attach Fittings and Support Beam - Main Landing Gear Forward Trunnion Lower Housing Fuse Pin - Inspection and Replacement 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2011 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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.
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 24, 2011 777-57A0090 1 of 37
4.0
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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 4 D. Description .............................................. 1 4 E. Compliance .............................................. 1 5 F. Approval ............................................... 1 6 G. Manpower .............................................. 1 6 H. Weight and Balance Changes .................................... 1 7 I. Electrical Load Data ......................................... 1 7 J. References .............................................. 1 7
1. Existing Data .......................................... 1 7
2. Data supplied with this Service Bulletin ............................ 1 7
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 1 7 K. Publications Affected ........................................ 1 7 L. Interchangeability and Intermixability of Parts ........................... 1 8
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 2 D. Parts Necessary to Change Spares ................................. 2 2 E. Special Tooling - Price and Availability ............................... 2 2 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 4 FIGURE 1: LEFT MLG FORWARD TRUNNION LOWER HOUSING FUSE PIN CROSS BOLT INSPECTION .................................................. 2 6 FIGURE 2: RIGHT MLG FORWARD TRUNNION LOWER HOUSING FUSE PIN CROSS BOLT INSPECTION .................................................. 2 9 FIGURE 3: LEFT MLG FORWARD TRUNNION UPPER AND LOWER HOUSING FUSE PIN REPLACEMENT .................................................. 3 2 FIGURE 4: RIGHT MLG FORWARD TRUNNION UPPER AND LOWER HOUSING FUSE PIN REPLACEMENT ........................................ 3 5
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Commercial Airplanes 777 Service Bulletin ALERT SummaryNumber: 777-57A0090Original Issue: August 24, 2011 ATA System: 5754 SUBJECT: WINGS - Landing Gear Attach Fittings and Support Beam - Main Landing Gear Forward Trunnion Lower Housing Fuse 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 Accomplishment of this service bulletin will make sure the Main Landing Gear (MLG) Forward Trunnion Lower Housing fuse pins and related cross bolts are correctly installed. An incorrectly installed fuse pin and cross bolt could result in migration of the fuse pin from the MLG Forward Trunnion Lower Housing. A migrated or missing fuse pin could lead to faster fatigue rates and possible failure of the adjacent fuse pins in the MLG Forward Trunnion Upper and Lower Housing. Failure of the fuse pins in the MLG Forward Trunnion Upper and Lower Housing could result in an incorrect MLG break-away sequence and cause the MLG to puncture the wing box which could result in fuel leaks. Failure of the fuse pins could also result in possible gear collapse causing a runway excursion during take-off or landing.
Boeing has received four reports of retaining cross bolt hardware not fully engaged into the MLG Forward Trunnion Lower Housing fuse pins. Reports indicated the incorrectly installed cross bolt or bolts were found during a scheduled C-check inspection, a MLG replacement, a 4C inspection, and a hard landing inspection.
All reports found the cross bolt and lock wire intact, but found the bolt not properly engaged in the fuse pin. The cross bolt and lock wire are used to prevent the fuse pin from migrating out of position. A migrated or missing fuse pin in the MLG Forward Trunnion Lower Housing can cause the remaining fuse pins in the MLG Forward Trunnion Upper and Lower Housing to fatigue at a faster rate.
This service bulletin provides instructions to inspect and replace the necessary fuse pins in MLG Forward Trunnion Upper and Lower Housing. Correct installation of the cross bolt into the fuse pin will make sure all fuse pins in the MLG Forward Trunnion Upper and Lower Housing will not migrate.
Boeing Service Related Problem (SRP) 777-SRP-57-0246 and Boeing Fleet Team Digest (FTD) 777 FTD 57-10006 are related to this service bulletin.
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Original Issue: August 24, 2011 777-57A0090 5 of 37
ACTION Do a Detailed Inspection (DET) of the MLG Forward Trunnion Lower Housing fuse pins for correctly installed cross bolts. If necessary, lift the airplane and replace the MLG Forward Trunnion Upper and Lower Housing fuse pins making sure cross bolts are correctly installed.
EFFECTIVITY 777-200, -200LR, -300, -300ER and 777F Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
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 airplanes in warranty as of October 28, 2010. Please refer to Paragraph 2.B., Industry Support Information.
MANPOWER Elapsed HoursTotal Task HoursAirplanes
16.0044.00All
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability
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Original Issue: August 24, 2011 777-57A0090 6 of 37 BOEING SERVICE BULLETIN 777-57A0090
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BOEING SERVICE BULLETIN 777-57A0090
ALERT ALERT FWD INBD
LEFT SIDE SHOWN TRUNNION
RIGHT SIDE OPPOSITE
• MLG FORWARD
TRUNNION
UPPER HOUSING
FUSE PIN
MLG FORWARD
TRUNNION
LOWER HOUSING
FUSE PIN
SIDE LOAD
FWD STRAPS
DO A DETAILED INSPECTION (DET) OF ALL THE MLG FORWARD TRUNNION LOWER HOUSING FUSE PINS FOR CORRECTLY INSTALLED CROSS BOLTS.
IF NECESSARY, LIFT THE AIRPLANE AND REPLACE THE MLG FORWARD
TRUNNION UPPER AND LOWER HOUSING FUSE PINS MAKING SURE CROSS BOLTS ARE CORRECTLY INSTALLED.
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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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Commercial Airplanes 777 Service Bulletin ALERT Number: 777-57A0090 Original Issue: August 24, 2011 ATA System: 5754 SUBJECT: WINGS - Landing Gear Attach Fittings and Support Beam - Main Landing Gear Forward Trunnion Lower Housing Fuse 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 for the airplane(s) shown below.
DESCRIPTIONCONFIGURATIONGROUP 777-200 Airplanes line number 1 thru 635-1 777-200 Airplanes with extended range (ER) option line number 41 thru 868 -2 777-300 Airplanes line number 94 thru 567-3 777-200LR/-300ER and 777F Airplanes line number 423 thru 915-4 Airplane Models:
777-200, 777-200LR, 777-300, 777-300ER, 777F GroupVariable Number 1WA001 - WA017 1WA076 - WA080
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GroupVariable Number 1WA086 - WA093 1WA101 - WA104 1WA116 - WA119 1WA131 - WA137 1WA171 - WA175 1WA196 - WA198 1WA206 - WA212 1WA221 - WA223 1WA231 - WA232 1WA241 - WA250 1WA261 - WA266 1WA281 - WA283 1WA301 - 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
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GroupVariable Number 2WB411 - WB413 2WB416 - WB439 2WB446 - WB453 2WB476 2WB481 - WB484 3WB501 - WB512 3WB531 - WB537 3WB551 - WB554 3WB591 - WB597 3WB601 - WB606 3WB611 - WB622 3WB631 - WB638 3WB646 - 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
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GroupVariable Number 2WC571 - WC574 2WC581 4WD001 - WD002 4WD011 - WD018 4WD031 - WD036 4WD046 - WD055 4WD066 - WD075 4WD081 - WD088 4WD091 4WD096 4WD101 - WD103 4WD501 - WD513 4WD521 - WD541 4WD546 - WD554 4WD561 - WD573 4WD581 - WD599 4WD606 - WD609 4WD621 - WD632 4WD651 - WD665 4WD671 - WD676 4WD691 - WD709 4WD741 - WD752 4WD761 - WD771 4WD786 - WD788 4WD796 - WD813 4WD826 - WD837 4WD846 - WD861 4WD871 - WD883 4WD911 - WD915 4WD921 - WD922 4WD936 - WD939 4WD946 - WD951 4WD966 - WD970
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