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Commercial Airplanes 757 Service Bulletin Number: 757-28A0079 Original Issue: July 16, 2008 Revision 2: January 11, 2012 ATA System: 2822 SUBJECT: FUEL - Engine Fuel Feed System - Fuel Pump Control Ground Fault Interrupter (GFI) Relay Installation 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2008 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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 16, 2008 757-28A0079Revision 2: January 11, 2012 2 of 50 BOEING SERVICE BULLETIN 757-28A0079
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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 4 C. Reason ................................................ 1 4 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 8
1. Existing Data: ......................................... 1 8
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 9 L. Interchangeability and Intermixability of Parts ........................... 1 9
2. MATERIAL INFORMATION ........................................ 2 1 A. Material - Price and Availability ................................... 2 1 B. Industry Support Information .................................... 2 1 C. Parts Necessary For Each Airplane ................................. 2 1
1. Kits/Parts: ........................................... 2 1
2. Parts and Materials Supplied by the Operator: ........................ 2 1
3. Parts Modified and Reidentified: ............................... 2 1
4. Parts Removed and Not Replaced: .............................. 2 2 D. Parts Necessary to Change Spares ................................. 2 2 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: P33 PANEL PLATE 'C' - GROUND FAULT INTERRUPTER (GFI) RELAY - REPLACEMENT [Group 1, Configuration 1] ................................... 4 2 FIGURE 2: P37 PANEL PLATE 'B' - GROUND FAULT INTERRUPTER (GFI) RELAY - REPLACEMENT [Group 1, Configuration 1] ................................... 4 4 FIGURE 3: FUEL BOOST PUMP CONTROL GROUND FAULT INTERRUPTER (GFI) CONTROL RELAY SCHEMATIC REFERENCE [Group 1, Configuration 1] ................... 4 6 FIGURE 4: P33 PANEL, PLATE C - GROUND FAULT INTERRUPTER (GFI) RELAY – ELECTRICAL BONDING RESISTANCE MEASUREMENTS ........................ 4 7 FIGURE 5: P37 PANEL, PLATE B - GROUND FAULT INTERRUPTER (GFI) RELAY – ELECTRICAL BONDING RESISTANCE MEASUREMENTS ........................ 4 9
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Commercial Airplanes 757 Service Bulletin Revision Transmittal SheetNumber: 757-28A0079Original Issue: July 16, 2008 Revision 2: January 11, 2012 ATA System: 2822 SUBJECT: FUEL - Engine Fuel Feed System - Fuel Pump Control Ground Fault Interrupter (GFI) Relay Installation 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 Revision 1 of this service bulletin.
But, more work is necessary on airplanes changed in accordance with the Original Issue of this service bulletin, thus Group 1, Configuration 2 is added to the service bulletin effectivity, for those airplanes. Group 1, Configuration 2 gives instructions to do a General Visual Inspection (GVI) of the Ground Fault Interrupter (GFI) relay installation screw grip lengths, and replace them if necessary, then measure the electrical bonding resistance of the GFI relay and repair the bond if necessary.
REASON FOR REVISION This revision is sent to correct formatting and typographical errors in the Work Instructions and Figures that were introduced at Revision 1 of this service bulletin. Group 1, Configuration 2 is added to the service bulletin effectivity, and applied to sections, as applicable, to better identify the more work necessary for airplanes changed in accordance with the Original Issue of this service bulletin. The Compliance statement is changed to refer to the original issue date of this service bulletin and future FAA AD statement added. Step table footnotes in Figures 1 and 2 are updated to better describe the re-identification of the P37 Panel. Also, the procedure for screw inspection and replacement is improved. Figures 4 and 5 are updated to give an improved procedure for electrical bonding resistance measurements. The service bulletin format standards have been updated where applicable.
These sections are changed:
1. Summary, Reason: More data on Airworthiness Limitation, 28-AWL-21, added.
2. Summary, Action: Applicability and actions for Group 1, Configuration 2 added.
3. Summary, Compliance: Changed to refer to the original issue date of this service bulletin and added future FAA AD release statement.
4. Summary, Manpower: Applicability and Manpower table for Group 1, Configuration 2 added.
5. Summary, Illustration: Applicability and actions for Group 1, Configuration 2 added.
6. Paragraph 1.A., Effectivity: Configurations added to group configuration table.
7. Paragraph 1.C., Reason: Detail regarding Airworthiness Limitation, 28-AWL-21, added.
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8. Paragraph 1.D., Description: Applicability and actions for Group 1, Configuration 2 added.
9. Paragraph 1.E., Compliance: Changed to refer to the original issue date of this service bulletin and added future FAA AD release statement.
10. Paragraph 1.G., Manpower: Applicability and Manpower table for Group 1, Configuration 2 added.
11. Paragraph 1.H., Weight and Balance Changes: Applicability added.
12. Paragraph 1.H., Electrical Load Data: Applicability added.
13. Paragraph 1.J.1., Existing Data: References updated.
14. Paragraph 1.K., Publications Affected: Added Aircraft Maintenance Manual and Equipment List. Corrected Maintenance Planning Data reference, to Section 9.
15. Paragraph 2.C.2., Parts and Materials Supplied by the Operator: Applicability and parts table for Group 1, Configuration 2 added. Footnote changed.
16. Paragraph 2.C.4., Parts Removed and Not Replaced: Table deleted - not applicable.
17. Paragraph 3.A., General Information: General notes updated.
18. Paragraph 3.B., Work Instructions, Part 1: Applicability and step 5 added. Order changed for Steps 11 and
12. Formatting errors corrected.
19. Paragraph 3.B., Work Instructions, Part 2: Applicability and steps 1 thru 4 added. Added replacement screw, P/N NAS1801-08-7 (or BACS12HN08-7). Corrected steps 5 and 6 and added notes for SRM data.
20. Figure 1: Applicability added. Updated part numbers and added optional replacement screw, P/N BACS12HN08-7. Corrected steps 1 thru 3 and footnotes (a) and (b). Added footnotes (c) and (d).
21. Figure 2: Applicability added. Updated part numbers and added optional replacement screws, P/N BACS12CK08-7 or BACS12HN08-7. Corrected steps 1 thru 3 and footnotes (a) and (b). Added footnotes
(c) and (d).
22. Figure 3: Applicability added.
23. Figure 4: Footnotes updated and illustration corrected.
24. Figure 5: Footnotes updated and illustration corrected.
The data given in Information Notice 757-28A0079 R01 IN 02 and 757-28A0079 R01 IN 03 is included in this revision.
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.
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REVISION HISTORY July 16, 2008Original Issue:
August 24, 2010Revision 1:
January 11, 2012Revision 2:
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Commercial Airplanes 757 Service Bulletin SummaryNumber: 757-28A0079Original Issue: July 16, 2008 Revision 2: January 11, 2012 ATA System: 2822 SUBJECT: FUEL - Engine Fuel Feed System - Fuel Pump Control Ground Fault Interrupter (GFI) Relay Installation
CONCURRENT REQUIREMENTS None.
BACKGROUND This service bulletin gives instructions to replace the power control relays for the fuel boost pumps and override pumps. The relays are located in the P33 and P37 equipment panels in the main equipment center. The new relays include a Ground Fault Interrupt (GFI) feature. The GFI feature will protect the fuel pumps from damage caused by electrical arcing. Electrical arcing could create a possible source of ignition of flammable fuel vapors in the fuel tanks. Ignition of flammable fuel vapors could cause a fire or explosion which could put the airplane in an unsafe condition.
This service bulletin is the result of the safety assessments conducted by Boeing under SFAR 88, "Fuel Tank System Fault Tolerance Evaluation Requirements".
The Airworthiness Limitation (AWL) 28-AWL-21, "Boost Pump Ground Fault Interrupter (GFI)" listed in Maintenance Planning Data (MPD) Document, D622N001 - 757 MPD Section 9 , Airworthiness Limitations (AWL's) and Certification Maintenance Requirements (CMR's) is related to this service bulletin. The Airworthiness Limitation (AWL) 28-AWL-21 requires operators to verify every year the continued functionality of the GFI circuit.
The related 757-200 airplane service bulletin number is 757-28A0078.
ACTION (PRR 55000-10RS) Group 1, Configuration 1:
Get access to the main equipment center. On the P33 and P37 panels, replace the six GFI relays and make sure the grip lengths of the installation screws are correct. Replace the installation screws if too short. Measure the electrical bonding resistance between the GFI relays and the P33 Panel, Plate C, and P37 Panel, Plate B, as applicable. Do an operational test of the fuel boost pumps.
Group 1, Configuration 2:
Get access to the main equipment center. On the P33 and P37 panels, do a General Visual Inspection of the GFI relay installation screws, for correct grip length. Replace the screws if too short. Measure the electrical bonding resistance between the GFI relays and the P33 Panel, Plate C, and P37 Panel, Plate B, as applicable, and repair the bond if necessary.
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EFFECTIVITY 757-300 Airplane(s). 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 operators incorporate the changes shown in this service bulletin within 60 months after the original issue date of this service bulletin.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes given in this service bulletin.
MANPOWER Group 1, Configuration 1:
Elapsed HoursTotal Task Hours
6.08.0 Group 1, Configuration 2:
Elapsed HoursTotal Task Hours
3.03.0
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
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BOEING SERVICE BULLETIN 757-28A0079 GROUP 1, CONFIGURATION 1 P33 PANEL:
GROUP 1, CONFIGURATION 1 -REPLACE RELAYS
DO AN OPERATIONAL TEST -MEASURE ELECTRICAL
OF THE FUEL BOOST PUMPS BONDING RESISTANCE GROUP 1, CONFIGURATION 1 P37 PANEL:
-REPLACE RELAYS -MEASURE ELECTRICAL
BONDING RESISTANCE GROUP 1, CONFIGURATION 2 P33 AND P37 PANELS:
- DO A GENERAL VISUAL
INSPECTION OF RELAY
INSTALLATION SCREWS FOR
CORRECT GRIP LENGTH
- MEASURE ELECTRICAL BONDING J30183
RESISTANCE Original Issue: July 16, 2008 Revision 2: January 11, 2012 757-28A0079
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