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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-24A2360 Original Issue: January 18, 2012 Revision 1: May 02, 2012 ATA System: 2421 SUBJECT: ELECTRICAL POWER - 115 Volt AC Power Generation and Protection - APU Power Feeder Cable Inspection and Clamp Change 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Unpublished Work.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: January 18, 2012 747-24A2360Revision 1: May 02, 2012 1 of 50
2.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 18, 2012 747-24A2360Revision 1: May 02, 2012 2 of 50 BOEING SERVICE BULLETIN 747-24A2360
ALERTALERT
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 5 D. Description .............................................. 1 5 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 8
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 8 K. Publications Affected ........................................ 1 8 L. Interchangeability and Intermixability of Parts ........................... 1 8 M. Software Accomplishment Summary ................................ 1 8
2. MATERIAL INFORMATION ........................................ 1 9 A. Material - Price and Availability ................................... 1 9 B. Industry Support Information .................................... 1 9 C. Parts Necessary for Each Airplane ................................. 1 9
1. Kits/Parts ............................................ 1 9
2. Parts and Materials Supplied by the Operator ........................ 2 1
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 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: POWER FEEDER INSPECTION AND REPAIR - STRUCTURAL INSPECTION - LEFT BULKHEAD STA 2638 [Group 1] ............................... 2 7 FIGURE 2: CLAMP REPLACEMENT AND GROMMET INSTALLATION - LEFT BULKHEAD STA 2638 [Group 1] ............................................ 3 0 FIGURE 3: POWER FEEDER INSPECTION AND REPAIR - STRUCTURAL INSPECTION - RIGHT BULKHEAD STA 2638 [Group 1] ............................... 3 3 FIGURE 4: CLAMP REPLACEMENT AND GROMMET INSTALLATION - RIGHT BULKHEAD STA 2638 [Group 1] ............................................ 3 6 FIGURE 5: POWER FEEDER INSPECTION AND REPAIR - STRUCTURAL INSPECTION - LEFT BULKHEAD STA 2638 [Group 2] ............................... 3 9 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 18, 2012 747-24A2360Revision 1: May 02, 2012 3 of 50 BOEING SERVICE BULLETIN 747-24A2360
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FIGURE 6: CLAMP REPLACEMENT AND GROMMET INSTALLATION - LEFT BULKHEAD STA 2638 [Group 2] ............................................ 4 2 FIGURE 7: POWER FEEDER INSPECTION AND REPAIR - STRUCTURAL INSPECTION - RIGHT BULKHEAD STA 2638 [Group 2] ............................... 4 5 FIGURE 8: GROMMET INSTALLATION AND CLAMP REPLACEMENT - RIGHT BULKHEAD STA 2638 [Group 2] ............................................ 4 8 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 18, 2012 747-24A2360Revision 1: May 02, 2012 4 of 50 BOEING SERVICE BULLETIN 747-24A2360
ALERTALERT
Commercial Airplanes 747 Service Bulletin ALERT Revision Transmittal SheetNumber: 747-24A2360Original Issue: January 18, 2012 Revision 1: May 02, 2012 ATA System: 2421 SUBJECT: ELECTRICAL POWER - 115 Volt AC Power Generation and Protection - APU Power Feeder Cable Inspection and Clamp Change 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.
Airplanes were deleted to the service bulletin effectivities.
REASON FOR REVISION Revision 1 is sent to revise the original issued service bulletin to delete airplanes from this service bulletin. Also, to revise the kits and the work instruction.
Airplanes deleted from Group 1:
RT041-RT042, RT074, RT531-RT535, RT641, RT643-RT653, RT711-RT717, RT861-RT864, RU002-RU003, RU803, RU805, RU831 and RU833-RU839.
Airplanes deleted from Group 2:
RM001-RM009, RT756-RT757, RU004-RU006, RU122-RU125 and RU840-RU841.
This revision also corrects and changes the following information:
Updated 1.A Planning Information - Effectivity, to delete effectivities Updated 1.C Planning Information - Reason, updated to add reason for service bulletin revision.
Updated 1.D Planning Information - Description, updated to add additional description.
Updated 1.E Planning Information - Compliance Time, updated to add new compliance time.
Updated 2.C Material Information - Updated to include new parts in kits and added footnotes.
Update 3.A Accomplishment Instruction - Updated to include additional general information.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 18, 2012 747-24A2360Revision 1: May 02, 2012 5 of 50
Update 3.B Accomplishment Instruction - updated to revise work instructions.
Figure 2, 4, 6 - Updated to add new parts numbers and notes.
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.
REVISION HISTORY January 18, 2012Original Issue:
May 02, 2012Revision 1:
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 18, 2012 747-24A2360Revision 1: May 02, 2012 6 of 50 BOEING SERVICE BULLETIN 747-24A2360
ALERTALERT
Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-24A2360Original Issue: January 18, 2012 Revision 1: May 02, 2012 ATA System: 2421 SUBJECT: ELECTRICAL POWER - 115 Volt AC Power Generation and Protection - APU Power Feeder Cable Inspection and Clamp Change
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 prevent possible damage to Auxiliary Power Unit (APU) power feeder cables from chafing against the forward flange of the frame inner chord on the structure near Station 2638 on the left and right sides. If the power feeders have damage, arcs can occur and introduce an ignition source in a flammable fluid leakage zone which does not have smoke detectors or fire extinguishers. Arcing in a flammable fluid leakage zone can be an ignition source for fuel vapors and cause a fire.
Operators have given reports of faults of the APU. Investigations showed that the power feeder cables on APU generator number 2 had damage from chafing at Station 2638. The cables showed evidence of a hot short to the adjacent structure. Reports show that the adjacent structure had damage from arcs. An investigation shows that the location and configuration of the existing clamps must be changed. Also, the protective grommets must be installed on the structure to prevent possible chafing. The chafing and subsequent arcing occurred in a flammable leakage zone.
This service bulletin gives the instructions to inspect the APU power feeder cables for damage and to inspect the structure for damage. Also, this bulletin gives instructions to install protection on edges of the structure, and change the clamp configuration on the wire bundles to give sufficient clearance from the structure. These changes will prevent chafing and remove the risk of a fire.
Boeing Service Related Problem (SRP) 747-SRP-24-0142 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 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 18, 2012 747-24A2360Revision 1: May 02, 2012 7 of 50
ReferenceAffectedPlanning Data Paragraph 1.E., ComplianceYesAD Related Paragraph 1.H., Weight and Balance ChangesYesWeight and Balance Change Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedYesPublications 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/PartsYesKits/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 Get access to the in the area just forward of the APU bulkhead STA 2638. Do a detailed visual inspection of APU power feeders W866 or W944 on the left side and W868 or W946 on the right side for damage. If damage to the power feeder cable is found, do a detailed visual inspection of the adjacent structure for damage. If damage is found to the power feeder cables and/or the structure, repair the damage. Replace certain clamps on the power feeder cables and install grommets on the structure. Close access.
EFFECTIVITY 747-400 Airplanes with a horizontal stabilizer fuel tank. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
COMPLIANCE Boeing recommends that the inspection, change and/or repair given in this service bulletin be done within 14 months after the Revision 1 date of this service bulletin.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of July 13, 2011. Please refer to Paragraph
2.B., Industry Support Information.
MANPOWER Elapsed HoursTotal Task HoursAirplanes
5.705.70Group 1 airplanes
5.855.85Group 2 airplanes
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 18, 2012 747-24A2360Revision 1: May 02, 2012 8 of 50 BOEING SERVICE BULLETIN 747-24A2360
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BOEING SERVICE BULLETIN 747-24A2360
ALERT ALERT Refer to Paragraph 2.A., Material - Price and Availability.
STA 2638 STA 2658 STA 2638 STA 2618 STA APU 2598
FIREWALL
LEFT SIDE
DIAGONAL BRACE
- INSPECT POWER
FEEDER CABLE
- INSPECT ADJACENT
STRUCTURE
- REPAIR DAMAGED
POWER FEEDER CLAMPS
- INSTALL GROMMETS W866 OR W944
RIGHT SIDE
DIAGONAL BRACE
- INSPECT POWER
FEEDER CABLE
- INSPECT ADJACENT
STRUCTURE
- REPAIR DAMAGED POWER FEEDER • BULKHEAD CLAMPS
- INSTALL GROMMETS W868 2124415 OR W946 Original Issue: January 18, 2012 Revision 1: May 02, 2012 Export Controlled ECCN: 9E991 - BOEING 747-24A2360 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9 of 50
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 18, 2012 747-24A2360Revision 1: May 02, 2012 10 of 50 BOEING SERVICE BULLETIN 747-24A2360
ALERTALERT
BLANK PAGE
Commercial Airplanes 747 Service Bulletin ALERT Number: 747-24A2360 Original Issue: January 18, 2012 Revision 1: May 02, 2012 ATA System: 2421 SUBJECT: ELECTRICAL POWER - 115 Volt AC Power Generation and Protection - APU Power Feeder Cable Inspection and Clamp Change
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 This service bulletin is for the airplane(s) shown below.
Refer to Service Bulletin Index D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
DESCRIPTIONCONFIGURATIONGROUP 747-400 Airplanes with a certain clamp configuration-1 747-400 Airplanes with a certain clamp configuration-2 Airplane Models:
747-400 GroupVariable Number 2RF001 - RF006 2RM010 - RM013 2RM021 - RM024 2RM026 - RM030 2RM036 - RM045 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 18, 2012 747-24A2360Revision 1: May 02, 2012 11 of 50
GroupVariable Number 2RM051 - RM053 2RM071 2RM081 - RM084 2RM091 2RM096 - RM097 2RM116 - RM117 2RM136 - RM147 2RM156 - RM158 2RM166 - RM177 2RM191 - RM192 2RM231 - RM233 2RM241 - RM246 2RM261 - RM264 2RM331 - RM333 2RM341 2RM351 - RM355 2RM366 - RM367 2RM401 - RM403 2RM426 2RM431 2RM441 - RM443 2RM445 2RM801 - RM803 1RT001 - RT011 2RT012 - RT014 1RT043 - RT047 1RT073 1RT101 - RT103 1RT121 1RT131 - RT134 2RT135 - RT137 2RT151 - RT152 1RT162 - RT163 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 18, 2012 747-24A2360Revision 1: May 02, 2012 12 of 50 BOEING SERVICE BULLETIN 747-24A2360