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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-25A3555 Original Issue: November 04, 2009 Revision 1: July 27, 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2009 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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: November 04, 2009 747-25A3555Revision 1: July 27, 2011 1 of 141
5.0
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Original Issue: November 04, 2009 747-25A3555Revision 1: July 27, 2011 2 of 141 BOEING SERVICE BULLETIN 747-25A3555
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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 5 B. Concurrent Requirements ...................................... 1 5 C. Reason ................................................ 1 6 D. Description .............................................. 1 7 E. Compliance .............................................. 1 7 F. Approval ............................................... 1 9 G. Manpower .............................................. 1 9 H. Weight and Balance Changes .................................... 2 2 I. Electrical Load Data ......................................... 2 3 J. References .............................................. 2 3
1. Existing Data .......................................... 2 3
2. Data supplied with this Service Bulletin ............................ 2 3
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 2 3 K. Publications Affected ........................................ 2 3 L. Interchangeability and Intermixability of Parts ........................... 2 4
2. MATERIAL INFORMATION ........................................ 2 5 A. Material - Price and Availability ................................... 2 5 B. Industry Support Information .................................... 2 9 C. Parts Necessary For Each Airplane ................................. 2 9
1. Kits/Parts ............................................ 2 9
2. Parts and Materials Supplied by the Operator ........................ 3 5
3. Parts Modified and Reidentified ................................ 3 5
4. Parts Removed and Not Replaced .............................. 3 6 D. Parts Necessary to Change Spares ................................. 3 6 E. Special Tooling - Price and Availability ............................... 3 6 F. Special Tooling Necessary to do this Service Bulletin ....................... 3 6
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 3 7 A. GENERAL INFORMATION ..................................... 3 7 B. WORK INSTRUCTIONS ....................................... 3 8 FIGURE 1: FORWARD ALUMINUM GUTTER REINFORCING BRACKET INSTALLATION ...... 4 2 FIGURE 2: AFT ALUMINUM GUTTER REINFORCING BRACKET INSTALLATION [Group 1, 3] . . . 52 FIGURE 3: AFT ALUMINUM GUTTER REINFORCING BRACKET INSTALLATION [Group 2] .... 5 8 FIGURE 4: FLOOR PANEL REMOVAL .................................. 6 4 FIGURE 5: FLOOR PANEL MODIFICATION ............................... 6 7 FIGURE 6: FLANGED SLEEVE INSTALLATION ............................. 7 0 FIGURE 7: LEFT SIDE DRAIN TUBE INSTALLATION [Group 1, 3] ................... 7 4 FIGURE 8: RIGHT SIDE DRAIN TUBE INSTALLATION [Group 1, 3] .................. 8 3 FIGURE 9: LEFT SIDE DRAIN TUBE INSTALLATION [Group 2] .................... 9 1 FIGURE 10: RIGHT SIDE DRAIN TUBE INSTALLATION [Group 2] .................... 9 8 FIGURE 11: FLOOR PANEL INSTALLATION ............................... 1 0 5
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FIGURE 12: EXHAUST PLENUM SEALING ............................... 1 0 8 FIGURE 13: MEC DRIP SHIELD STIFFENER REMOVAL [Group 3] .................. 1 1 3 FIGURE 14: MEC DRIP SHIELD CLEANING AND PREPARATION ................... 1 1 6 FIGURE 15: REPAIR OF HOLES IN MEC DRIP SHIELD ........................ 1 2 0 FIGURE 16: MEC DRIP SHIELD PANEL STIFFENER INSTALLATION ................. 1 2 3 FIGURE 17: MEC DRIP SHIELD FIBERGLASS REINFORCING OVERCOAT INSTALLATION .... 1 2 8 FIGURE 18: CARGO LINER SUPPORT REMOVAL ........................... 1 3 2 FIGURE 19: CARGO LINER SUPPORT INSTALLATION ........................ 1 3 5 APPENDIX A: FABRICATION INSTRUCTIONS FOR 284U1135-107 AND 284U1135-108 ....... 1 3 8
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Commercial Airplanes 747 Service Bulletin ALERT Revision Transmittal SheetNumber: 747-25A3555Original Issue: November 04, 2009 Revision 1: July 27, 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 Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2010-NM-035-AD, is related to this service bulletin.
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 incorporate changes found during validation of the initial release of the service bulletin.
These sections were changed:
1. Section 1.G., Manpower - corrected applicable figures for different groupings and work packages.
2. Section 2.A., Material - Price and Availability - Corrected Note (b) to reference OPTION #2 for all Groups.
3. Section 2.C.2., Parts and Materials Supplied by the Operator - Changed name of BMS 5-92 to ADHESIVE, added BMS 5-95, added type and class information for all materials.
4. Section 3.B., Work Instructions - Work Packages 1 and 2 - added reference to Digital Interface Unit in removal and installation of E/E rack components.
5. Section 3.B., Work Instructions - Work Package 1 - Added steps for removal/installation of cargo liner support (Figures 18 and 19)
6. Figure 1 - changed locating dimensions for the 284U1135-77/-78 brackets.
7. Figure 2 - corrected the quantity of existing fasteners to be removed.
8. Figure 7 - Left side, forward drain tube routing was changed due to interference with an existing pitot/static shroud.
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Original Issue: November 04, 2009 747-25A3555Revision 1: July 27, 2011 5 of 141
9. Figure 9 - Left side, forward drain tube routing was changed due to interference with an existing pitot/static shroud.
10. Figure 16 - Added new instructions to add a fillet around the panel stiffeners to reduce chance of trapping air bubbles under fiberglass overcoat.
11. Figure 16 - Added new note allowing trimming of the panel stiffeners.
12. Figure 18 - New figure giving instructions for removing cargo liner support.
13. Figure 19 - New figure giving instructions for installation of cargo liner support.
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.
As a part of a service bulletin validation program, this change was completed on airplane RT438 by Service Bulletin 747-25A3555 Original Issue before the release of Revision 01 of this service bulletin. The change completed on airplane RT438 by Service Bulletin 747-25A3555 Original Issue is equivalent to the release of Revision 01 of this service bulletin. Airplane RT438 has the configuration of a Group 1 airplane.
REVISION HISTORY November 04, 2009Original Issue:
July 27, 2011Revision 1:
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Original Issue: November 04, 2009 747-25A3555Revision 1: July 27, 2011 6 of 141 BOEING SERVICE BULLETIN 747-25A3555
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Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-25A3555Original Issue: November 04, 2009 Revision 1: July 27, 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 gutters 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 multi power system loss in-flight of #1, 2 & 3 AC electrical power systems located in the MEC. The loss of AC power engaged the emergency back-up power system, allowing the plane to land safely.
The forward MEC drip shield gutters and exhaust plenum have each been identified as part of the leak path into the MEC. Multiple operators have reported cracked MEC drip shield gutters and upper surface. These cracks can allow water to penetrate the MEC drip shield and enter the MEC.
This service bulletin will install aluminum gutter reinforcing brackets to correct the cracking in the MEC drip shield gutters. Flanged sleeves and drain tubes will be installed in the lower surface of the exhaust plenum to allow water to drain away from the MEC as an interim action. A fiberglass reinforcing overcoat will be installed as a terminating action.
Boeing Service Related Problem (SRP) 747-SRP-25-0277 is related to this service bulletin.
As a part of a service bulletin validation program, this change was completed on airplane RT438 by Service Bulletin 747-25A3555 Original Issue before the release of Revision 01 of this service bulletin. The change completed on airplane RT438 by Service Bulletin 747-25A3555 Original Issue is equivalent to the release of Revision 01 of this service bulletin. Airplane RT438 has the configuration of a Group 1 airplane.
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ACTION (PRR 85901-95RS) All operators will add aluminum gutter reinforcing brackets to forward and aft MEC drip shield gutters. Due to the difficulty of accessing the top surface of the MEC drip shield, an interim action is available. The interim action installs flanged sleeves and drain tubes to the lower surface of the exhaust plenum. The terminating action is to add a fiberglass reinforcing overcoat to the MEC drip shield.
EFFECTIVITY 747-400/-400D Airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes.
COMPLIANCE Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2010-NM-035-AD, is related to this service bulletin.
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 not available for the configuration changes given in this service bulletin.
MANPOWER Group 1:
Elapsed HoursTotal Task HoursAirplanes
14.2519.00Work Package 1
20.5520.55Work Package 2
23.0062.00Work Package 3 Group 2:
Elapsed HoursTotal Task HoursAirplanes
13.7518.50Work Package 1
21.8521.85Work Package 2
23.0062.00Work Package 3 Group 3:
Elapsed HoursTotal Task HoursAirplanes
14.2519.00Work Package 1
20.5520.55Work Package 2
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Group 3:
Elapsed HoursTotal Task HoursAirplanes
23.7562.75Work Package 3
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability.
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BOEING SERVICE BULLETIN 747-25A3555
ALERT ALERT
ALL OPERATORS WILL ADD ALUMINUM
GUTTER REINFORCING BRACKETS TO
FORWARD AND AFT MEC DRIP SHIELD GUTTERS. THE INTERIM ACTION INSTALLS FLANGED SLEEVES AND DRAIN TUBES TO THE LOWER SURFACE OF THE EXHAUST 000 PLENUM. THE TERMINATING ACTION IS TO
ADD A FIBERGLASS REINFORCING
OVERCOAT TO THE MEC DRIP SHIELD STA 460 STA 440 1737897 Original Issue: November 04, 2009 Revision 1: July 27, 2011 747-25A3555
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 10 of 141
Commercial Airplanes 747 Service Bulletin ALERT Number: 747-25A3555 Original Issue: November 04, 2009 Revision 1: July 27, 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 85901-95RS for data about this change.
DESCRIPTIONCONFIGURATIONGROUP 747-400 Passenger airplanes prior to line number 982 that do not have existing MEC drip shield stiffeners installed -1 747-400/-400D Passenger airplanes line number 982 and later.-2 747-400 Passenger airplanes prior to line number 982 that have existing MEC drip shield stiffeners installed -3 Airplane Models:
747-400, 747-400D GroupVariable Number 2RF001 - RF006 2RM001 - RM007
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GroupVariable Number 2RM010 - RM013 2RM021 - RM024 2RM026 - RM030 2RM036 - RM045 2RM051 - RM053 2RM071 2RM081 - RM084 2RM091 2RM096 - RM097 2RM116 - RM117 2RM126 - RM127 2RM129 - RM132 2RM136 - RM147 2RM156 - RM158 2RM166 - RM177 2RM191 - RM192 2RM231 - RM233 2RM241 - RM246 2RM261 - RM264 2RM316 - RM318 2RM331 - RM333 2RM341 2RM351 - RM355 2RM366 - RM367 2RM401 - RM403 2RM426 2RM431 2RM441 - RM443 2RM445 2RM801 - RM803 2RM811 - RM813 3RT001 - RT005 1RT006 - RT009
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