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Commercial Airplanes 757 Service Bulletin Number: 757-28A0078 Original Issue: July 16, 2008 Revision 1: August 24, 2010 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2008 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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 757-28A0078Revision 1: August 24, 2010 1 of 47
3.0
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BLANK PAGE
Table of Contents
Revision Transmittal Sheet5
Summary7
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 1 2 B. Concurrent Requirements ...................................... 1 2 C. Reason ................................................ 1 2 D. Description .............................................. 1 3 E. Compliance .............................................. 1 4 F. Approval ............................................... 1 4 G. Manpower .............................................. 1 4 H. Weight and Balance Changes .................................... 1 5 I. Electrical Load Data ......................................... 1 5 J. References .............................................. 1 5
1. Existing Data: ......................................... 1 5
2. Data supplied with this Service Bulletin: ........................... 1 6
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 6 K. Publications Affected ........................................ 1 6 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 ................................. 1 9
1. Kits/Parts: ........................................... 1 9
2. Parts and Materials Supplied by the Operator: ........................ 1 9
3. Parts Modified and Reidentified: ............................... 1 9
4. Parts Removed and Not Replaced: .............................. 1 9 D. Parts Necessary to Change Spares ................................. 1 9 E. Special Tooling - Price and Availability ............................... 1 9 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 0
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 1 A. GENERAL INFORMATION ..................................... 2 1 B. WORK INSTRUCTIONS ....................................... 2 2 FIGURE 1: P33 PANEL PLATE 'C' - RELAY REPLACEMENT ...................... 3 9 FIGURE 2: P37 PANEL PLATE 'B' - RELAY REPLACEMENT ...................... 4 1 FIGURE 3: FUEL BOOST PUMP CONTROL GROUND FAULT INTERRUPTER (GFI) RELAY SCHEMATIC REFERENCE .......................................... 4 3 FIGURE 4: ELECTRICAL BONDING RESISTANCE CHECK FOR GROUND FAULT INTERRUPTER (GFI) RELAYS, P33 PANEL ..................................... 4 4 FIGURE 5: ELECTRICAL BONDING RESISTANCE CHECK FOR GROUND FAULT INTERRUPTER (GFI) RELAYS, P37 PANEL ..................................... 4 6
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Commercial Airplanes 757 Service Bulletin Revision Transmittal SheetNumber: 757-28A0078Original Issue: July 16, 2008 Revision 1: August 24, 2010 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 More work is necessary on airplanes changed in accordance with the original issue of this service bulletin. Do a General Visual Inspection of the installation screws for the GFI relays K187, K10011, K190, on Plate C of the P33 Panel and the installation screws for the GFI relays K188, K189, K10012, on Plate B of the P37 Panel to ensure the necessary grip length screw was used. More work is necessary to measure the electrical bonding resistance between the GFI Relays and the P33 Panel, Plate C, and to measure the electrical bonding resistance between the GFI Relays and the P37 Panel, Plate B.
REASON FOR REVISION This Revision 1 is sent to tell operators that the screws used to install the relays in FIGURE 1 have been changed from NAS1801-08-5 to NAS1801-08-7. Substitution information for the installation screws was added to FIGURE
2. This revision also provides a new electrical bonding resistance check of the GFI relays installed on the P33 and the P37 Panels.
These sections were changed:
1. Revised Paragraph 1.C., Reason to add the reason for Revision 01.
2. Revised Paragraph 1.D., Description to add 'More work is necessary' note and the maintenance zones table.
3. Revised Paragraph 1.J., References to add 757-200 SRM 51-40-02, 757-200CB SRM 51-40-02 , 757-200PF SRM 51-40-02, 757-200CB SRM 51-40-03, 757-200PF SRM 51-40-03, 757-200 SRM 51-40-03, and added a table for installation drawings used in Paragraph 1.J.3.
4. Revised Paragraph 1.K., Publications Affected to add the Damage Tolerance Inspection note.
5. Revised Paragraph 3.A., General Information to add general notes for fastener installation and substitution.
6. Revised Paragraph 3.B., Work Instructions to add the existing work instructions to a new PART 1 and new steps 3.B.7 and 3.B.8. Also added new PART 2.
7. Revised FIGURE 1 step table to add new sub-steps.
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8. Revised FIGURE 2 step table to add optional fastener information. New sub-steps were added.
9. Added FIGURE 4 to provide instructions for measuring the electrical bonding resistance between the GFI relays K187, K10011, K190, on the P33 Panel, and Plate C.
10. Added FIGURE 5 to provide instructions for measuring the electrical bonding resistance between the GFI relays K188, K189, K10012, on the P37 Panel, and Plate B.
The data given in Information Notice 757-28A0078 R00 IN01 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.
REVISION HISTORY July 16, 2008Original Issue:
August 24, 2010Revision 1:
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Original Issue: July 16, 2008 757-28A0078Revision 1: August 24, 2010 6 of 47 BOEING SERVICE BULLETIN 757-28A0078
Commercial Airplanes 757 Service Bulletin SummaryNumber: 757-28A0078Original Issue: July 16, 2008 Revision 1: August 24, 2010 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 the 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 relay feature will protect the fuel pumps from damage caused by electrical arcing because the electrical power will be removed from the pump if a ground fault is detected. 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".
This change affects section 9 of the Maintenance Planning Data (MPD) Document. New Airworthiness Limitations (AWL) "28-AWL-21" will be added to section 9 of the MPD to include a functional check of the ground fault interrupt (GFI) relays for the fuel boost pumps and override pumps.
The related 757-300 airplane service bulletin number is 757-28A0079.
ACTION (PRR 55000-10RS) Get access to the main equipment center. At the P33 and P37 panels, replace six relays. Check the electrical bonding resistance between the GFI relays and the P33 Panel, Plate C, and P37 Panel, Plate B. Do an operational test of the fuel boost pumps.
EFFECTIVITY See Service Bulletin Paragraph 1.A.1. for effectivity.
COMPLIANCE Boeing recommends that operators incorporate the changes shown in this service bulletin within 60 months of the date on the service bulletin.
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INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes given in this service bulletin.
MANPOWER Elapsed HoursTotal Task Hours
6.08.0
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
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Commercial Airplanes 757 Service Bulletin Number: 757-28A0078 Original Issue: July 16, 2008 Revision 1: August 24, 2010 ATA System: 2822 SUBJECT: FUEL - Engine Fuel Feed System - Fuel Pump Control Ground Fault Interrupter (GFI) Relay Installation
1. PLANNING INFORMATION A. Effectivity
1. Airplanes Refer to Service Bulletin Index Document D624N001 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for the airplanes shown below. An equivalent change is on subsequent production airplanes. Refer to PRR55000-10RS for data about this change.
DESCRIPTIONCONFIGURATIONGROUP All 757-200, 757-200CB, and 757-200PF airplanes.-1 Airplane Models:
757-200, 757-200CB, 757-200PF GroupVariable Number 1NA001 - NA028 1NA191 - NA199 1NA201 - NA239 1NA301 - NA305 1NA341 - NA352 1NA391 - NA399 1NA401 - NA408 1NA441 - NA447 1NA501 - NA586 1NB001 - NB004
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GroupVariable Number 1NB021 - NB023 1NB036 - NB041 1NB051 - NB053 1NB061 - NB073 1NB079 1NB131 - NB148 1NB161 - NB162 1NB166 - NB168 1NB201 - NB204 1NB221 - NB228 1NB230 1NB236 1NB239 1NB261 - NB267 1NB291 - NB299 1NB301 - NB302 1NB311 - NB312 1NB321 - NB331 1NB421 - NB438 1NB446 1NB451 - NB454 1NB501 - NB523 1NB561 1NB571 1NB581 - NB583 1NC001 - NC033 1NC041 - NC042 1NC051 - NC052 1NC056 - NC062 1NC066 - NC084 1NC091 - NC094 1NC151 1NC161
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GroupVariable Number 1NC901 - NC951 1NC971 - NC974 1ND001 - ND007 1ND011 - ND059 1ND111 - ND113 1ND161 - ND199 1ND201 - ND203 1ND221 - ND225 1ND241 - ND248 1ND301 - ND322 1ND401 1ND891 1ND895 1NE001 - NE008 1NE011 - NE088 1NE091 - NE094 1NE141 - NE150 1NE161 - NE177 1NE201 - NE204 1NE301 - NE302 1NE311 - NE325 1NJ001 - NJ004 1NJ031 - NJ032 1NJ551 - NJ555 1NN001 - NN002 1NN051 - NN052 1NP901 - NP904 1NS601 - NS616 1NT001 - NT009 1NT201 - NT202 1NT231 - NT234 1NT237 - NT240 1NT242
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GroupVariable Number 1NT245 - NT248 1NT281 - NT289 1NT341 - NT347 1NT351 - NT360 1NT371 - NT373 1NT375 - NT379 1NT381 - NT386 1NT401 - NT409 1NT411 - NT412 1NT426 - NT427 1NT431 - NT432 1NT436 - NT438 1NT441 - NT442 1NT446 1NT701 - NT769 1NT791 - NT796 1NT861 - NT862 1NT881 - NT885 1NT901 - NT916 1NT971 - NT985 1NU031 - NU038
2. Spares Affected None.
B. Concurrent Requirements None.
C. Reason This service bulletin gives the 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 relay feature will protect the fuel pumps from damage caused by electrical arcing because the electrical power will be removed from the pump if a ground fault is detected. 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.
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