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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-25A3613 Original Issue: June 22, 2012 ATA System: 2551 SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Aft Main Equipment Center (MEC) Drip Shield Gutter Repair Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 300-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2012 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Unpublished Work.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, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, 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. BOEING is a trademark of Boeing Management Company.
Original Issue: June 22, 2012 747-25A3613 1 of 39
2.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 22, 2012 747-25A3613 2 of 39 BOEING SERVICE BULLETIN 747-25A3613
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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 3 E. Compliance .............................................. 1 4 F. Approval ............................................... 1 4 G. Manpower .............................................. 1 4 H. Weight and Balance Changes .................................... 1 5 I. Electrical Load Data ......................................... 1 5 J. References .............................................. 1 5
1. Existing Data: ......................................... 1 5
2. Data Supplied with this Service Bulletin: ........................... 1 5
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 5 K. Publications Affected ........................................ 1 5 L. Interchangeability and Intermixability of Parts ........................... 1 5 M. Software Accomplishment Summary ................................ 1 6
2. MATERIAL INFORMATION ........................................ 1 7 A. Material - Price and Availability ................................... 1 7 B. Industry Support Information .................................... 1 7 C. Parts Necessary for Each Airplane ................................. 1 7
1. Kits/Parts ............................................ 1 7
2. Parts and Materials Supplied by the Operator ........................ 1 7
3. Parts Modified and Reidentified ................................ 1 7
4. Parts Removed and Not Replaced .............................. 1 7 D. Parts Necessary to Change Spares ................................. 1 7 E. Special Tooling - Price and Availability ............................... 1 8 F. Special Tooling Necessary to do this Service Bulletin ....................... 1 8
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 1 9 A. GENERAL INFORMATION ..................................... 1 9 B. WORK INSTRUCTIONS ....................................... 2 0 FIGURE 1: CARGO LINER SUPPORT REMOVAL ............................ 2 1 FIGURE 2: AFT MEC DRIP SHIELD GUTTER CLEANING AND PREPARATION FOR GENERAL VISUAL INSPECTION .......................................... 2 5 FIGURE 3: AFT MEC DRIP SHIELD GUTTER REPAIR ......................... 2 9 FIGURE 4: AFT MEC DRIP SHIELD GUTTER REINFORCEMENT ................... 3 2 FIGURE 5: CARGO LINER SUPPORT INSTALLATION ......................... 3 6 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 22, 2012 747-25A3613 3 of 39 BOEING SERVICE BULLETIN 747-25A3613
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 22, 2012 747-25A3613 4 of 39 BOEING SERVICE BULLETIN 747-25A3613
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Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-25A3613Original Issue: June 22, 2012 ATA System: 2551 SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Aft Main Equipment Center (MEC) Drip Shield Gutter Repair
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 will reduce the possibility of water penetration into the main equipment center (MEC).
Disbonded aft MEC drip shield gutters have allowed water to drip past the MEC drip shield and into the Wire Integration Units (WIU). Water penetration into the WIUs could result in loss of flight critical systems.
An operator experienced water leaking from main deck cargo into the WIU. It flowed from the drip shield through disbonded floor seams into the aft MEC drip shield gutter, then onto the WIU Liquids can leak through the MEC drip shield due to disbonded aft MEC drip shield gutters resulting in water intrusion into the WIU of the MEC. Disbonding can occur due to improper preparation of the drip shield/gutter material, aging of materials, and/or poor workmanship.
This Service Bulletin does a general visual inspection of the aft MEC drip shield gutters for disbonded seams, and repairs them if necessary. A reinforcing layer of fiberglass is applied over the seam in the aft MEC drip shield gutter to ensure no future disbondments occur.
Boeing Service Related Problem (SRP) 747-SRP-25-0304 is related to this service bulletin This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Paragraph 1.E., ComplianceYesAD Related Paragraph 1.H., Weight and Balance ChangesYesWeight and Balance Change Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 22, 2012 747-25A3613 5 of 39
ReferenceAffectedPlanning Data Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedNoPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsNoKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator YesOperator Supplied Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required ACTION (PRR 85901-117RS)
- Do a general visual inspection of the aft MEC drip shield gutters for disbonded seam, and repair if necessary.
- Add fiberglass reinforcement to aft MEC drip shield gutters.
EFFECTIVITY 747-400, 747-400D, 747-400F 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 and times given in this service bulletin mandatory.
Boeing recommends that the inspection, change and/or repair given in this service bulletin be done within 24 months after the original issue date of this service bulletin.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes, inspection, and/or repair procedures given in this service bulletin.
MANPOWER Elapsed HoursTotal Task HoursAirplanes
6.1510.65Group 1 airplanes
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 22, 2012 747-25A3613 6 of 39 BOEING SERVICE BULLETIN 747-25A3613
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BOEING SERVICE BULLETIN 747-25A3613
ALERT ALERT STA 440 STA 460
- DO A GENERAL VISUAL INSPECTION
OF THE AFT MEC DRIP SHIELD
GUTTERS FOR DISBONDED SEAM, AND REPAIR IF NECESSARY.
- ADD FIBERGLASS REINFORCEMENT TO AFT MEC DRIP SHIELD GUTTERS. 00000 00000 2155129 Original Issue: June 22, 2012 Export Controlled ECCN: 9E991 - BOEING 747-25A3613 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 39
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 22, 2012 747-25A3613 8 of 39 BOEING SERVICE BULLETIN 747-25A3613
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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-25A3613 Original Issue: June 22, 2012 ATA System: 2551 SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Aft Main Equipment Center (MEC) Drip Shield Gutter Repair
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 D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for the airplane(s) shown below. Refer to PRR 85901-117RS for data about this change.
DESCRIPTIONCONFIGURATIONGROUP 747-400 passenger and freighter airplanes that have a two piece aft MEC drip shield gutter -1 Airplane Models:
747-400, 747-400D, 747-400F GroupVariable Number 1RF001 - RF006 1RL401 - RL402 1RL411 - RL418 1RL651 - RL654 1RM001 - RM007 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 22, 2012 747-25A3613 9 of 39
GroupVariable Number 1RM010 - RM013 1RM021 - RM024 1RM026 - RM030 1RM036 - RM045 1RM051 - RM053 1RM071 1RM081 - RM084 1RM091 1RM096 - RM097 1RM116 - RM117 1RM126 - RM127 1RM129 - RM132 1RM136 - RM147 1RM156 - RM158 1RM166 - RM177 1RM191 - RM192 1RM231 - RM233 1RM241 - RM246 1RM261 - RM264 1RM316 - RM318 1RM331 - RM333 1RM341 1RM351 - RM355 1RM366 - RM367 1RM401 - RM403 1RM426 1RM431 1RM801 - RM803 1RM811 - RM813 1RM851 - RM858 1RM861 1RM871 - RM876 1RM881 - RM886 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 22, 2012 747-25A3613 10 of 39 BOEING SERVICE BULLETIN 747-25A3613
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GroupVariable Number 1RM891 - RM899 1RM901 - RM903 1RM911 1RR701 1RR721 - RR724 1RR746 - RR748 1RR851 - RR856 1RR861 - RR862 1RR951 - RR952 1RT001 - RT014 1RT034 - RT035 1RT041 - RT047 1RT073 - RT074 1RT101 - RT103 1RT121 1RT131 - RT137 1RT151 - RT152 1RT162 - RT163 1RT165 - RT168 1RT401 - RT412 1RT431 - RT447 1RT452 - RT455 1RT457 - RT460 1RT462 - RT469 1RT471 - RT499 1RT502 - RT505 1RT511 - RT512 1RT514 - RT515 1RT517 1RT521 - RT523 1RT525 1RT527 1RT529 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 22, 2012 747-25A3613 11 of 39 BOEING SERVICE BULLETIN 747-25A3613
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GroupVariable Number 1RT531 - RT535 1RT551 - RT568 1RT571 1RT580 - RT591 1RT601 - RT614 1RT616 - RT630 1RT633 - RT634 1RT636 - RT641 1RT643 - RT654 1RT672 - RT673 1RT681 - RT682 1RT691 - RT699 1RT701 - RT704 1RT711 - RT717 1RT741 1RT744 - RT750 1RT753 - RT757 1RT776 - RT777 1RT783 - RT784 1RT801 - RT803 1RT811 - RT814 1RT831 - RT835 1RT861 - RT864 1RT877 - RT880 1RT931 - RT932 1RT945 - RT949 1RT951 - RT955 1RT966 1RU002 - RU006 1RU016 - RU017 1RU031 - RU032 1RU051 - RU052 1RU059 - RU062 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 22, 2012 747-25A3613 12 of 39 BOEING SERVICE BULLETIN 747-25A3613