TextPartly OCR
Some pages are OCR from a scan. OCR can misread letters and numbers.
Query with SQL
duckdb -csv -c "SELECT p.page, p.text_source, p.text, f.rights_holder, f.license FROM 'https://openairdocs.org/data/latest/service_document_file_page.parquet' p JOIN 'https://openairdocs.org/data/latest/service_document_file.parquet' f USING (file_sha256) WHERE p.file_sha256 = '2452c673934d4d97fc4f85f57367acc737118ce456d87abff27850c307c258bc' ORDER BY p.page"
Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.
SELECT p.page, p.text_source, p.text, f.rights_holder, f.license FROM 'https://openairdocs.org/data/latest/service_document_file_page.parquet' p JOIN 'https://openairdocs.org/data/latest/service_document_file.parquet' f USING (file_sha256) WHERE p.file_sha256 = '2452c673934d4d97fc4f85f57367acc737118ce456d87abff27850c307c258bc' ORDER BY p.page
Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.
Commercial Airplanes 737 Service Bulletin Number: 737-28A1227 Original Issue: August 02, 2010 Revision 2: September 23, 2014 ATA System: 2822 SUBJECT: FUEL - Distribution - Center and Auxiliary Tank Boost Pumps Fuel Control System Un-Commanded On Relay Installation and Related Wiring Changes 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Unpublished Work.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, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, 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.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 1 of 287
9.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 2 of 287 BOEING SERVICE BULLETIN 737-28A1227
BLANK PAGE
Table of Contents
Revision Transmittal Sheet7
S u m m a r y..................................................... 1 1
1. PLANNING INFORMATION ........................................ 1 5 A . E f f e c t i v i t y ............................................... 1 5
1. Airplanes ............................................ 1 5 2 . S p a r e s A f f e c t e d ........................................ 3 2 B. Concurrent Requirements ...................................... 3 2 C. Reason ................................................ 3 3 D . D e s c r i p t i o n .............................................. 3 4 E. Compliance .............................................. 3 6 F . A p p r o v a l ............................................... 3 6 G. Manpower .............................................. 3 6 H. Weight and Balance Changes .................................... 4 7 I. Electrical Load Data ......................................... 4 8 J . R e f e r e n c e s .............................................. 4 9
1. Existing Data: ......................................... 4 9
2. Data Supplied with this Service Bulletin: ........................... 4 9
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 5 0 K. Publications Affected ........................................ 5 0 L. Interchangeability and Intermixability of Parts ........................... 5 0 M. Software Accomplishment Summary ................................ 5 0
2. MATERIAL INFORMATION ........................................ 5 1 A. Material - Price and Availability ................................... 5 1 B. Industry Support Information .................................... 5 7 C . P a r t s N e c e s s a r y f o r E a c h A i r p l a n e ................................. 5 7 1 . K i t s / P a r t s : ........................................... 5 7
2. Parts and Materials Supplied by the Operator: ........................ 6 9
3. Parts Modified and Reidentified: ............................... 7 0
4. Parts Removed and Not Replaced: .............................. 7 2 D. Parts Necessary to Change Spares ................................. 7 2 E. Special Tooling - Price and Availability ............................... 7 2 F. Special Tooling Necessary to do this Service Bulletin ....................... 7 2
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 7 3 A. GENERAL INFORMATION ..................................... 7 3 B. WORK INSTRUCTIONS ....................................... 7 4 FIGURE 1: J2802 BOX ASSEMBLY - RELAYS AND SWITCHES INSTALLATION [Group 2-3; Group 5-6, Configuration 1] ......................................... 8 4 FIGURE 2: WIRE BUNDLE W1760 AND W1770 IN THE J2802 BOX ASSEMBLY - ROUTING [Group 2-3;
Group 5-6, Configuration 1] .................................. 8 9 FIGURE 3: WIRE BUNDLE W1760 IN THE J2802 BOX ASSEMBLY - WIRING CHANGE [Group 2-3; Group 5-6, Configuration 1] ...................................... 9 0 FIGURE 4: WIRE BUNDLE W1770 IN THE J2802 BOX ASSEMBLY - WIRING CHANGE [Group 2-3; Group 5-6, Configuration 1] ...................................... 9 3 FIGURE 5: J2802 BOX ASSEMBLY - RELAYS AND SWITCHES INSTALLATION [Group 5-6, Configuration 2 ] ................................................ 9 6 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 3 of 287 BOEING SERVICE BULLETIN 737-28A1227
FIGURE 6: WIRE BUNDLE W1760 AND W1770 IN THE J2802 BOX ASSEMBLY - ROUTING [Group 5-6, Configuration 2] ........................................ 1 0 1 FIGURE 7: WIRE BUNDLE W1760 IN THE J2802 BOX ASSEMBLY - WIRING CHANGE [Group 5-6, Configuration 2] ........................................ 1 0 2 FIGURE 8: WIRE BUNDLE W1770 IN THE J2802 BOX ASSEMBLY - WIRING CHANGE [Group 5-6, Configuration 2] ........................................ 1 0 6 FIGURE 9: WIRE BUNDLE W0368, W0386, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY - ROUTING [Group 2] ....................... 1 1 0 FIGURE 10: WIRE BUNDLE W0368 AND W1764 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 2; Group 7, Configuration 1-2; Group 8, Configuration 1-2; Group 11] ......................................... 1 1 5 FIGURE 11: WIRE BUNDLE W0386 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 2; Group 7, Configuration 1-2; Group 8, Configuration 1 - 2 ] ............................................... 1 1 8 FIGURE 12: WIRE BUNDLE W0368, W0386, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY - ROUTING [Group 3; Group 5-6, Configuration 1] ....... 1 2 1 FIGURE 13: WIRE BUNDLE W0368 AND W1764 FROM DISCONNECT PANEL A TO J2802 BOX ASSEMBLY
- WIRING CHANGE [Group 3; Group 5-6, Configuration 1; Group 10; Group 12, Configuration 1-2; Group 13, Configuration 1-2] .............................. 1 2 6 FIGURE 14: WIRE BUNDLE W0386 AND W1774 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGES [Group 3; Group 5-6, Configuration 1; Group 10; Group 12, Configuration 1-2; Group 13, Configuration 1-2] ....................... 1 2 9 FIGURE 15: WIRE BUNDLE W0368, W0386, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY - ROUTING [Group 4, 9] ..................... 1 3 2 FIGURE 16: WIRE BUNDLE W0368 AND W1764 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 4, 9] ........................ 1 3 8 FIGURE 17: WIRE BUNDLE W0386 AND W1774 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 4, 9, 11] ..................... 1 4 1 FIGURE 18: WIRE BUNDLE W0368, W0386, W1034, W1046, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY - ROUTING [Group 5, Configuration 2] ...... 1 4 3 FIGURE 19: WIRE BUNDLE W0368, W1046 AND W1764 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 5, Configuration 2; Group 12, Configuration 3-4] . 148 FIGURE 20: WIRE BUNDLE W0386, W1034 AND W1774 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 5, Configuration 2; Group 12, Configuration 3-4] . 153 FIGURE 21: WIRE BUNDLE W0368, W0386, W1034, W1046, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY - ROUTING [Group 6, Configuration 2] ...... 1 5 8 FIGURE 22: WIRE BUNDLE W0368, W1046 AND W1764 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 6, Configuration 2; Group 13, Configuration 3-4] . 166 FIGURE 23: WIRE BUNDLE W0386, W1034 AND W1774 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 6, Configuration 2; Group 13, Configuration 3-4] . 171 FIGURE 24: WIRE BUNDLE W0368, W0386, W1034, W1046, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY - ROUTING ..................... 1 7 6 FIGURE 25: WIRE BUNDLE W0368, W1046 AND W1764 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 7, Configuration 3-4] ............... 1 7 7 FIGURE 26: WIRE BUNDLE W0386, W1034 AND W1774 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 7, Configuration 3-4] ............... 1 8 1 FIGURE 27: WIRE BUNDLE W0368, W0386, W1034, W1046, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY - ROUTING [Group 8, Configuration 3-4] ..... 1 8 5 FIGURE 28: WIRE BUNDLE W0368, W1046 AND W1764 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 8, Configuration 3-4] ............... 1 9 1 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 4 of 287 BOEING SERVICE BULLETIN 737-28A1227
FIGURE 29: WIRE BUNDLE W0386, W1034 AND W1774 FROM P6 DISCONNECT PANEL TO J2802 BOX ASSEMBLY - WIRING CHANGE [Group 8, Configuration 3-4] ............... 1 9 5 FIGURE 30: J2802 BOX ASSEMBLY - CLOSE ACCESS [Group 2-3, 5-6] ............... 1 9 9 FIGURE 31: J2802 BOX ASSEMBLY - RELAYS AND SWITCHES INSTALLATION FOR AIRPLANES WITH AIRSTAIRS [Group 4, 7-13, Configuration 1] ........................ 2 0 1 FIGURE 32: J2802 BOX ASSEMBLY - RELAYS AND SWITCHES INSTALLATION FOR AIRPLANES WITH AIRSTAIRS [Group 4, 7-13, Configuration 2] ........................ 2 0 7 FIGURE 33: WIRE BUNDLE W1760 AND W1770 IN THE J2802 BOX ASSEMBLY (AIRPLANES WITH AIRSTAIRS) - ROUTING [Group 4; Group 7, Configuration 1-2; Group 8, Configuration 1-2;
Group 9-11; Group 12, Configuration 1-2; Group 13, Configuration 1-2] .......... 2 1 1 FIGURE 34: J2802 BOX ASSEMBLY (AIRPLANES WITH AIRSTAIRS) - RELAYS AND SWITCHES INSTALLATION [Group 7-8, 12-13, Configuration 3] .................... 2 1 2 FIGURE 35: J2802 BOX ASSEMBLY - RELAYS AND SWITCHES INSTALLATION FOR AIRPLANES WITH AIRSTAIRS [Group 7-8, 12-13, Configuration 4] ...................... 2 1 8 FIGURE 36: WIRE BUNDLE W1760 AND W1770 IN THE J2802 BOX ASSEMBLY (AIRPLANES WITH AIRSTAIRS) - ROUTING [Group 7, Configuration 3-4; Group 8, Configuration 3-4; Group 12, Configuration 3-4; Group 13, Configuration 3-4] ....................... 2 2 4 FIGURE 37: WIRE BUNDLE W0368, W0386, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY (AIRPLANES WITH AIRSTAIRS) - ROUTING [Group 7, Configuration 1-2; Group 8, Configuration 1-2; Group 11] ......................... 2 2 5 FIGURE 38: WIRE BUNDLE W0368, W0386, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY (AIRPLANES WITH AIRSTAIRS) - ROUTING [Group 10; Group 12, Configuration 1-2; Group 13, Configuration 1-2] ....................... 2 3 1 FIGURE 39: WIRE BUNDLE W0368, W0386, W1034, W1046, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY (AIRPLANES WITH AIRSTAIRS) - ROUTING [Group 12, Configuration 3-4] ..................................... 2 3 7 FIGURE 40: WIRE BUNDLE W0368, W0386, W1034, W1046, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY (AIRPLANES WITH AIRSTAIRS) - ROUTING [Group 13, Configuration 3-4] ..................................... 2 4 3 FIGURE 41: WIRE BUNDLE W0368, W0386, W1034, W1046, W1764 AND W1774 FROM P6 DISCONNECT PANELS TO J2802 BOX ASSEMBLY (AIRPLANES WITH AIRSTAIRS) - ROUTING [Group 7, Configuration 3-4] ....................................... 2 5 2 FIGURE 42: J2802 BOX ASSEMBLY - CLOSE ACCESS [Group 4, 7-13] ............... 2 5 8 FIGURE 43: WIRE BUNDLE W1760 THE J2802 BOX ASSEMBLY - WIRING CHANGE [Group 4; Group 7, Configuration 1-2; Group 8, Configuration 1-2; Group 9-11; Group 12, Configuration 1-2; Group 13, Configuration 1-2] ..................................... 2 6 0 FIGURE 44: WIRE BUNDLE W1770 THE J2802 BOX ASSEMBLY - WIRING CHANGE [Group 4; Group 7, Configuration 1-2; Group 8, Configuration 1-2; Group 9-11; Group 12, Configuration 1-2; Group 13, Configuration 1-2] ..................................... 2 6 3 FIGURE 45: WIRE BUNDLE W1760 THE J2802 BOX ASSEMBLY - WIRING CHANGE [Group 7, Configuration 3-4; Group 8, Configuration 3-4; Group 12, Configuration 3-4; Group 13, Configuration 3-4] ....................................... 2 6 6 FIGURE 46: WIRE BUNDLE W1770 THE J2802 BOX ASSEMBLY - WIRING CHANGE [Group 7, Configuration 3-4; Group 8, Configuration 3-4; Group 12, Configuration 3-4; Group 13, Configuration 3-4] ....................................... 2 7 1 FIGURE 47: J2802 BOX ASSEMBLY (WITHOUT AUXILIARY TANKS) - LABELS - INSTALLATION [Group 2-3; Group 5-6, Configuration 1] ............................... 2 7 6 FIGURE 48: J2802 BOX ASSEMBLY (WITH AUXILIARY TANKS) - LABELS - INSTALLATION [Group 5-6, Configuration 2] ........................................ 2 8 0 APPENDIX A: KIT ORDERING FLOW CHART ............................... 2 8 4 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 5 of 287 BOEING SERVICE BULLETIN 737-28A1227
APPENDIX B: BOEING PART DEMAND INTENT ............................. 2 8 7 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 6 of 287 BOEING SERVICE BULLETIN 737-28A1227
Commercial Airplanes 737 Service Bulletin Revision Transmittal SheetNumber: 737-28A1227Original Issue: August 02, 2010 Revision 2: September 23, 2014 ATA System: 2822 SUBJECT: FUEL - Distribution - Center and Auxiliary Tank Boost Pumps Fuel Control System Un-Commanded On Relay Installation and Related Wiring Changes 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-189-AD, is related to this service bulletin.
More work is necessary for airplanes in Groups 1 thru 3, 5 and 6, changed in accordance with Original Issue or Revision 1 of this service bulletin that did not install labels on the J2802 Box Assembly. Do the work identified in the Work Instructions.
Airplanes in Group 4 and 7 thru 13 with airstairs, that were originally included in Groups 1 thru 8, but could not accomplish the Original Issue or Revision 1 of this service bulletin, because concurrent Boeing Service Bulletins, 737-28A1216 and 737-28A1228 could not be accomplished until Boeing Service Bulletin 737-28A1216 Revision 2 and 737-28A1228 Revision 1 had been released. Operators can now accomplish the work in accordance with this revision of this service bulletin.
REASON FOR REVISION This revision is sent to align its accomplishment with the release of Boeing Service bulletins 737-28A1216 Revision 2 and 737-28A1228 Revision 1, for the installation of relays and toggle switches into the new design of J2802 Box Assembly and the related wiring, for airplanes with airstairs. Because of this condition, Boeing designed a different J2802 Box Assembly that can be installed on airplanes with airstairs without interference.
This revision includes the different design and lets airplanes with airstairs accomplish this service bulletin. As a result of the changes, airplanes with airstairs have been separated from those without airstairs and have been subsequently identified in new Groups 9 thru 13 and existing groups 4, 7 and 8. Airplanes without airstairs are identified in Groups 1 thru 3, 5 and 6.
These sections are changed:
1. Summary Background: Planning Data Table added.
2. Summary Action: Statement changed.
3. Summary Compliance: New Notice of Proposed Rule Making data added.
4. Summary Figure: Airplanes with airstairs added.
5. Paragraph 1.A., Effectivity: Changed to show new airplane groups and configurations.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 7 of 287
6. Paragraph 1.B., Concurrent Requirements: Concurrent requirement data is changed.
7. Paragraph 1.C., Reason: Revision 2 statement added.
8. Paragraph 1.D., Description: Revision 2 statement added and Applicability is added to affected maintenance zones.
9. Paragraph 1.E., Compliance: New Notice of Proposed Rulemaking data added.
10. Paragraph 1.G., Manpower: Manpower estimates for new groups added.
11. Paragraph 1.H., Weight and Balance Changes: Applicability added for new airplane groups.
12. Paragraph 1.I., Electrical Load Data: Applicability added for new airplane groups.
13. Paragraph 1.J.1., Existing Data: References list changed.
14. Paragraph 1.K., Publications Affected: Chapter-Section changed.
15. Paragraph 1.M., Software Accomplishment Summary: New section added.
16. Paragraph 2.A., Material - Price and Availability: Group Configuration data for tables changed.
17. Paragraph 2.C.2., Parts and Materials Supplied by the Operator: Table changed with parts added and deleted.
18. Paragraph 2.C.3., Parts Modified and Reidentified: Part numbers changed.
19. Paragraph 3.A., General Information: Notes changed to latest standard and additional information added.
20. Paragraph 3.B., Work Instructions: Work instructions for new groups are added.
21. FIGURE 1 and FIGURE 5: Applicability, Illustration and Step Table changed.
22. FIGURE 2 and FIGURE 6: Applicability, Illustration and Title changed.
23. FIGURE 3, FIGURE 4, FIGURE 7 and FIGURE 8: Applicability and Title changed.
24. FIGURE 9: Illustration changed.
25. FIGURE 10 and FIGURE 11: Applicability and Illustration changed.
26. FIGURE 12: Illustration changed with views added and clarified.
27. FIGURE 13 and FIGURE 14: Applicability, Illustration and Step Table changed
28. FIGURE 15, FIGURE 16 and FIGURE 17: Applicability and Illustration changed.
29. FIGURE 18: Illustration changed.
30. FIGURE 19 to FIGURE 23: Applicability and Illustration changed.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 8 of 287 BOEING SERVICE BULLETIN 737-28A1227
31. FIGURE 24: Figure deleted.
32. FIGURE 25 to FIGURE 29: Applicability and Illustration changed.
33. FIGURE 30: Applicability and Step Table changed.
34. FIGURE 31 to FIGURE 48: Added to service bulletin due to change to Work Instructions.
35. APPENDIX A: Added to aid Kit procurement.
36. APPENDIX B: Added to service bulletin.
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 August 02, 2010Original Issue:
July 18, 2011Revision 1:
September 23, 2014Revision 2:
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 9 of 287 BOEING SERVICE BULLETIN 737-28A1227
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 10 of 287 BOEING SERVICE BULLETIN 737-28A1227
BLANK PAGE
Commercial Airplanes 737 Service Bulletin SummaryNumber: 737-28A1227Original Issue: August 02, 2010 Revision 2: September 23, 2014 ATA System: 2822 SUBJECT: FUEL - Distribution - Center and Auxiliary Tank Boost Pumps Fuel Control System Un-Commanded On Relay Installation and Related Wiring Changes
CONCURRENT REQUIREMENTS Refer to Paragraph 1.B., Concurrent Requirements.
BACKGROUND This service bulletin affects the 737-200/-200C/-300/-400/-500 airplanes with line numbers 292 thru 3132 that have center tanks, and center and auxiliary fuel tanks. Operators with 737-100/-200/-200C airplanes with line numbers 1 thru 291 should contact Boeing to obtain engineering and accomplishment instructions for this modification. This service bulletin is sent to give 'un-commanded on' protection for the fuel pump control system.
Instructions are given to add one more relay, as a fail safe, for each fuel pump in the center and auxiliary fuel tanks. If this service bulletin is not done, the fuel pumps could run dry, which increases the pumps temperature and could cause an ignition source for fuel vapor in the fuel tank. Ignition of the flammable fuel vapors in the fuel tanks, could cause a fire or explosion which will put the airplane in an unsafe condition.
The Boeing system safety assessment necessary for Special Federal Aviation Regulation (SFAR) 88, showed that electrical faults within the fuel tank pump system can cause a fuel pump to operate when the fuel pump switch is in the 'OFF' position. Boeing has developed a new system to prevent extended operation of the fuel tank boost pumps in this condition. This new system has a second relay to prevent the operation of a pump when its switch is in the 'OFF' position. The auto shutdown relay currently installed for each pump gives the same solution as the new additional relay, but is known to have caused in-service problems because its contacts have 'welded' closed and continued to let power be supplied. This condition is referred to as 'un-commanded on' (UCO) pump operation. This new second relay added to the existing fuel control circuit and interfaced with the P5-2 fuel control module, prevents UCO operation of the fuel boost pumps. The system senses if there is a voltage remaining in the fuel boost pump circuit and activates the UCO relay to remove the power. In the flight deck, the pump low pressure light in the P5-2 fuel systems module, and master caution light come on when the fuel pump is at low pressure. No additional indication is provided for dry running pumps.
Accomplishment of this service bulletin installs new UCO relays and toggle switches in the J2802 Box Assembly located in the Electronic Equipment Bay (E/E bay). This service bulletin also changes and adds new wire bundles that route from the J2802 box assembly to the P5 Forward Overhead Panel and the P6 Disconnect Panels.
Installation of the new UCO relays for each pump will prevent "dry running" of the fuel pumps and reduce the risk of fuel tank fire or explosion.
The Airworthiness Limitations (AWL) 28-AWL-24 (Center Tank) and 28-AWL-25 (Auxiliary Fuel Tank) for 737-100/200/200C airplanes, and AWL 28-AWL-23 (Center Tank) and 28-AWL-24 (Auxiliary Fuel Tank) for 737-300/400/500 airplanes listed in 737-100/200/200C/300/400/500 AWLs and Certification Maintenance Requirements (CMRs), D6-38278-CMR, are related to this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 11 of 287
Boeing Fleet Team Digest (FTD) 737 FTD 28-04004 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 Paragraph 1.E., Compliance and Paragraph
1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesYesWeight and Balance Change Paragraph 1.I., Electrical Load DataYesElectrical 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 Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required ACTION (PRR 35443-RS) Remove equipment as necessary to get access to the J2802 Box Assembly on the E2 and E3 support posts in the E/E bay, P6 Load Control Center in the flight compartment/control cabin, and P6 disconnect panels. Remove the cover from the J2802 Box Assembly and install wire bundles W1760 and W1770, relays and toggle switches.
Change wire bundles W0368, W0386, W1034, W1046, W1764 and W1774, as applicable, between the P6 disconnect panels and J2802 Box Assembly. Check the continuity of all the new and changed wires and do a functional test to make sure the changed fuel control system operates correctly.
Operators with Group 1 airplanes should contact Boeing to obtain engineering and accomplishment instructions for this modification and do the instructions.
EFFECTIVITY 737-100/200/200C/300/400/500 Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
COMPLIANCE Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2010-NM-189-AD, is related to this service bulletin.
Boeing recommends that the change given in this service bulletin be done within 60 months after the original issue date of this service bulletin.
Operators with Group 1 airplanes should contact Boeing to obtain engineering and accomplishment instructions for this modification and do the instructions.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 02, 2010 737-28A1227Revision 2: September 23, 2014 12 of 287 BOEING SERVICE BULLETIN 737-28A1227