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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-25A3588 Original Issue: July 19, 2010 Revision 1: April 07, 2011 ATA System: 2551 SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Main Equipment Center Drip Shield Repair 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2010 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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: July 19, 2010 747-25A3588Revision 1: April 07, 2011 1 of 38
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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 19, 2010 747-25A3588Revision 1: April 07, 2011 2 of 38 BOEING SERVICE BULLETIN 747-25A3588
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BLANK PAGE
Table of Contents
Revision Transmittal Sheet5
Summary7
1. PLANNING INFORMATION ........................................ 1 1 A. Effectivity ............................................... 1 1
1. Airplanes ............................................ 1 1
2. Spares Affected ........................................ 1 4 B. Concurrent Requirements ...................................... 1 4 C. Reason ................................................ 1 4 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 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 7
2. MATERIAL INFORMATION ........................................ 1 9 A. Material - Price and Availability ................................... 1 9 B. Industry Support Information .................................... 1 9 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 1
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 3 A. GENERAL INFORMATION ..................................... 2 3 B. WORK INSTRUCTIONS ....................................... 2 3 FIGURE 1: MEC DRIP SHIELD CLEANING AND PREPARATION ................... 2 5 FIGURE 2: REPAIR OF HOLES IN MEC DRIP SHIELD ......................... 2 9 FIGURE 3: MEC DRIP SHIELD PANEL STIFFENER INSTALLATION [Group 1, 3] ........... 3 2 FIGURE 4: MEC DRIP SHIELD FIBERGLASS REINFORCING OVERCOAT INSTALLATION ..... 3 6
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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 19, 2010 747-25A3588Revision 1: April 07, 2011 4 of 38 BOEING SERVICE BULLETIN 747-25A3588
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Commercial Airplanes 747 Service Bulletin ALERT Revision Transmittal SheetNumber: 747-25A3588Original Issue: July 19, 2010 Revision 1: April 07, 2011 ATA System: 2551 SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Main Equipment Center Drip Shield Repair This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION No more work is necessary on the airplane(s) changed in accordance with the original issue of this service bulletin.
REASON FOR REVISION This revision is sent to remove airplane RT101 and correct the Operator Supplied materials table.
These sections were changed:
1. Paragraph 1.A., Effectivity - removed airplane RT101. RT101 was modified from passenger to freighter using non-Boeing engineering
2. Paragraph 2.C.2., Parts and Materials Supplied by the Operator - Added BMS 8-2, Type 13, Any Class, Grade A.
3. Paragraph 2.C.2., Parts and Materials Supplied by the Operator - Changed the acceptable BMS 8-2 grade from Grade B to Grade A.
4. Figure 3 - Added instructions to apply a fillet of BMS 5-92 around the perimeter of the panel stiffeners.
5. Figure 4 - Changed the outboard limits of the fiberglass cloth from LBL/RBL 60 to 2.00 minimum overlap past the LBL/RBL 49 seams.
Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location of important changes.
Pages with no vertical lines have no important changes.
The data given in Information Notice 747-25A3588 R00 IN01 is included in this revision.
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REVISION HISTORY July 19, 2010Original Issue:
April 07, 2011Revision 1:
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Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-25A3588Original Issue: July 19, 2010 Revision 1: April 07, 2011 ATA System: 2551 SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Main Equipment Center Drip Shield 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).
Cracking of the MEC drip shield has allowed water to drip past the MEC drip shield and through the exhaust plenum into the MEC. Water penetration into the MEC could result in loss of flight critical systems.
An operator experienced a loss of bus control unit (BCU) #1 and generator control units (GCU's) #1 and #2 while the airplane was still on the ground.
Cracking in the MEC drip shield and exhaust plenum have each been identified as part of the leak path into the MEC. Multiple operators have reported cracked MEC drip shield. These cracks can allow water to penetrate the MEC drip shield and enter the MEC.
This service bulletin will install a fiberglass reinforcing overcoat as a terminating action.
Boeing Service Related Problem (SRP) 747-SRP-25-0284 is related to this service bulletin.
ACTION (PRR 85901-102RS)
- Install honeycomb stiffening panels
- Install a fiberglass reinforcing overcoat
EFFECTIVITY 747-400F/-400 Airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes.
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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 available for airplanes in warranty as of January 14, 2009. Please refer to Paragraph 2.B., Industry Support Information.
MANPOWER Group 1, 3:
Elapsed HoursTotal Task HoursAirplanes
12.7520.50Group 1, 3 Group 2:
Elapsed HoursTotal Task HoursAirplanes
9.0016.75Group 2
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
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Original Issue: July 19, 2010 747-25A3588Revision 1: April 07, 2011 8 of 38 BOEING SERVICE BULLETIN 747-25A3588
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BOEING SERVICE BULLETIN 747-25A3588
ALERT ALERT INSTALL HONEYCOMB 000
STIFFENING PANELS
INSTALL A FIBERGLASS
REINFORCING OVERCOAT STA 460 STA 440 1971240 Original Issue: July 19, 2010 Revision 1: April 07, 2011 747-25A3588
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9 of 38
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 19, 2010 747-25A3588Revision 1: April 07, 2011 10 of 38 BOEING SERVICE BULLETIN 747-25A3588
ALERTALERT
BLANK PAGE
Commercial Airplanes 747 Service Bulletin ALERT Number: 747-25A3588 Original Issue: July 19, 2010 Revision 1: April 07, 2011 ATA System: 2551 SUBJECT: EQUIPMENT/FURNISHINGS - Electrical/Electronic Equipment Centers - Main Equipment Center Drip Shield 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 Document D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for the airplanes shown below. Refer to PRR 85901-102RS for data about this change.
DESCRIPTIONCONFIGURATIONGROUP 747-400 Freighter airplanes that have molded stiffening beads on the MEC drip shield.
-1 747-400 Freighter airplanes that have aluminum stiffeners installed on the top of the MEC drip shield by SB 747-25A3086 or in production.
-2 747-400 BCF airplanes that have molded stiffening beads on the MEC drip shield.
-3 Airplane Models:
747-400, 747-400F GroupVariable Number 2RL401 - RL402
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GroupVariable Number 1RL403 2RL411 - RL418 1RL419 - RL436 1RL451 - RL456 1RL461 - RL462 1RL471 - RL481 1RL491 - RL492 1RL501 - RL502 1RL511 - RL516 1RL521 - RL522 1RL531 - RL534 1RL551 1RL561 - RL568 1RL571 - RL572 1RL576 - RL577 1RL579 1RL581 - RL586 2RL651 - RL654 1RL655 1RL671 - RL675 1RL681 - RL684 1RL751 - RL752 3RM128 2RM851 - RM858 1RM859 2RM861 1RM862 - RM863 2RM871 - RM876 1RM877 - RM880 2RM881 - RM886 1RM887 - RM890 2RM891 - RM899 2RM901 - RM903
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Original Issue: July 19, 2010 747-25A3588Revision 1: April 07, 2011 12 of 38 BOEING SERVICE BULLETIN 747-25A3588