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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-25A3581 Original Issue: September 23, 2010 Revision 2: September 11, 2012 ATA System: 2500 SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile Drip Shield 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 © 2010 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Unpublished Work.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: September 23, 2010 747-25A3581Revision 2: September 11, 2012 1 of 63
3.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 2 of 63 BOEING SERVICE BULLETIN 747-25A3581
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Table of Contents
Revision Transmittal Sheet5
Summary9
1. PLANNING INFORMATION ........................................ 1 3 A. Effectivity ............................................... 1 3
1. Airplanes ............................................ 1 3
2. Spares Affected ........................................ 1 4 B. Concurrent Requirements ...................................... 1 5 C. Reason ................................................ 1 5 D. Description .............................................. 1 5 E. Compliance .............................................. 1 6 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 2
3. Parts Modified and Reidentified ................................ 2 3
4. Parts Removed and Not Replaced .............................. 2 3 D. Parts Necessary to Change Spares ................................. 2 3 E. Special Tooling - Price and Availability ............................... 2 3 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 3
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 5 A. GENERAL INFORMATION ..................................... 2 5 B. WORK INSTRUCTIONS ....................................... 2 6 FIGURE 1: ELECTRONICS EQUIPMENT CENTER - REMOVAL OF EXISTING DRIP SHIELD .... 2 7 FIGURE 2: ELECTRONICS EQUIPMENT CENTER - LOOSEN AFFECTED WIRE BUNDLES .... 3 3 FIGURE 3: ELECTRONICS EQUIPMENT CENTER - PROVISIONS FOR WIRE BUNDLE RELOCATION .................................................. 3 7 FIGURE 4: ELECTRONICS EQUIPMENT CENTER - RELOCATE WIRE BUNDLES ROUTING . . . 42 FIGURE 5: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF ALL SUPPORT BRACKETS AND NEW DRIP SHIELD ASSEMBLY ............................... 4 8 FIGURE 6: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF DRIP SHIELD DEFLECTORS .................................................. 5 7 FIGURE 7: ELECTRONICS EQUIPMENT CENTER - INSTALLATION OF NEW INSULATION BLANKET .................................................. 6 1 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 3 of 63 BOEING SERVICE BULLETIN 747-25A3581
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 4 of 63 BOEING SERVICE BULLETIN 747-25A3581
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Commercial Airplanes 747 Service Bulletin ALERT Revision Transmittal SheetNumber: 747-25A3581Original Issue: September 23, 2010 Revision 2: September 11, 2012 ATA System: 2500 SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile Drip Shield Change This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION More work is necessary on the airplane(s) changed in accordance with revision 1 of this service bulletin.
Airplane RT061 was added to Group 2 of this service bulletin effectivity.
REASON FOR REVISION This revision is sent to make changes to the service bulletin to address possible interference issues, which clarifies wire routing, allows for trimming of parts and adds parts to the top kit. Also to add 1 airplane to service bulletin effectivity.
These sections were changed:
1. In Paragraph 1.A.1., Airplanes, added airplane RT061 to Group 2.
2. In Paragraph 1.C.1., Kits/Parts, changed table to add more parts and revised quantities.
3. In Paragraph 1.M., added Software Accomplishment Summary paragraph.
4. In Paragraph 2.B., Industry Support Information, updated warranty statement.
5. In Paragraph 3.A., General Information, added note 8.
6. In Work Instructions, changed as follows:
a. Step 1, changed instructions to gain access.
b. Removed Step 9, not necessary to remove/install floor panel.
c. Re-numbered Step 10 to Step 9.
7. In Figure 2, changed as follows:
a. On Sheet 1, removed wire bundle callouts and bubble callouts.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 5 of 63
b. On Sheet 2, changed bubble callouts.
c. In step table changed more data and removed foot notes.
8. In Figure 3, changed as follows:
a. On Sheet 3, added new views D-D and E-E.
b. In Step Table, changed fasteners for steps 3 and 4 to BACB30MY6K() and BACC30M6.
9. In Figure 4, changed as follows:
a. Replaced sheet 1 and 2 illustrations.
b. Added sheet 3 and 4 illustrations.
c. Changed Step Table to match new illustrations.
10. In Figure 5, changed as follows:
a. On Sheet 4, added notes to allow trimming of drip shield forward bracket and to say existing fastener pattern may be different.
b. On Sheet 5, added note to allow trimming of drip shield aft bracket.
c. In Step Table, Step 10, added more data.
d. In Step Table, Step 11 and 15, added more data to allow for trimming of brackets.
e. In Step Table, Step 14 and 17, added substep to apply adhesive.
f. In Step Table, added foot notes (d), (e) and (f).
11. In Figure 6, changed as follows:
a. In sheet 2 and 3 illustrations, removed bubbles 1 and 2.
b. In sheets 2 and 3 illustrations, renumbered bubbles 3 through 6 to bubbles 1 through 4.
c. In Step Table, removed Steps 1 and 2, bond requirements moved to Steps 14 and 17 of Figure
5.
d. In Step Table, renumbered Steps 3 through 6 to Steps 1 through 4.
e. In Step Table, added footnotes (e) and (f) to allow for trimming of shield deflectors.
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.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 6 of 63 BOEING SERVICE BULLETIN 747-25A3581
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REVISION HISTORY September 23, 2010Original Issue:
June 30, 2011Revision 1:
September 11, 2012Revision 2:
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 7 of 63 BOEING SERVICE BULLETIN 747-25A3581
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 8 of 63 BOEING SERVICE BULLETIN 747-25A3581
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Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-25A3581Original Issue: September 23, 2010 Revision 2: September 11, 2012 ATA System: 2500 SUBJECT: EQUIPMENT/FURNISHINGS - Cargo and Accessory Compartments - M826 Cardfile Drip Shield 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 Refer to Paragraph 1.B., Concurrent Requirements.
BACKGROUND This service bulletin will mitigate water from exiting over the edge of the existing drip shield and contaminating electrical components in the M826 cardfile below. If this service bulletin is not incorporated, electrical components in the M826 cardfile can malfunction due to water contamination which could result in an electrical short and potential loss of several functions essential for safe flight.
An Operator reported finding evidence of water damage to Diode Fire Card 285U0072-1 in the M826 Automatic Fire Overheat Logic Test System (AFOLTS) cardfile following a false FWD CARGO FIRE message which resulted in an Air Turn Back (ATB). Measurements showed the drip shield sloped away from the two drains added by SB 747-25A3370 (-400F) and SB 747-25A3526 (-400 Boeing Converted Freighter) and mandated by Airworthiness Directive (AD). Boeing's subsequent investigation found other reports of water damage to circuit cards in M826 affecting several operators.
This service bulletin replaces the existing drip shield with a new drip shield, installs two new drip shield deflectors between the new drip shield and the two adjacent bulkheads, and relocates wire bundles that interfere with these installations.
Boeing Service Related Problem (SRP) 747-SRP-25-0282 is related to this service bulletin.
ACTION (PRR 85901-100RS) Do the following items:
1. Remove existing drip shield
2. Relocate wire bundle routing.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 9 of 63
3. Install new drip shield's brackets
4. Install new drip shield
5. Install new drip shield deflectors
6. Install new insulation blankets
EFFECTIVITY 747-400 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.
Boeing recommends that the change given in this service bulletin be done within 24 months after the revision 2 issue date of this service bulletin.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies may be available for airplanes in warranty as of October 8, 2008. Please refer to Paragraph 2.B., Industry Support Information.
MANPOWER Elapsed HoursTotal Task HoursAirplanes
14.7522.50GROUP 1
14.7522.50GROUP 2
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
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: September 23, 2010 747-25A3581Revision 2: September 11, 2012 10 of 63 BOEING SERVICE BULLETIN 747-25A3581
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BOEING SERVICE BULLETIN 747-25A3581
ALERT ALERT -REMOVE EXISTING DRIP SHIELD -REMOVE EXISTING BLANKET -REMOVE EXISTING BRACKETS -RELOCATE EXISTING WIRE BUNDLES -INSTALL NEW BRACKETS -INSTALL NEW DRIP SHIELD -INSTALL NEW DRIP SHIELD DEFLECTORS -INSTALL NEW BLANKET STA 400 STA 380 STA STA 340 1964805 Original Issue: September 23, 2010 Revision 2: September 11, 2012 Export Controlled ECCN: 9E991 - BOEING 747-25A3581 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details 11 of 63
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 23, 2010 747-25A3581Revision 2: September 11, 2012 12 of 63 BOEING SERVICE BULLETIN 747-25A3581