### Commercial **Airplane Group**  

# 737 Service Bulletin **Number: 737-28-1272** Date: October 31, 2008 ATA System: 2822 **SUBJECT:** FUEL - Engine Fuel Feed System - Main Tanks Engine Fuel Spar Valve Body Replacement 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. 9E991 ECCN: 

## BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2008 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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, 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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 1 of 29 3.0BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 2 of 29 **BOEING SERVICE BULLETIN 737-28-1272**

BLANK PAGE**Table of Contents** Summary ..................................................... 5 1. PLANNING INFORMATION......................................... 9 A. Effectivity................................................ 9 1. Airplanes............................................. 9 2. Spares Affected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 B. Concurrent Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 C. Reason. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 D. Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 F. Approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 G. Manpower. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 H. Weight and Balance Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 I. Electrical Load Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 J. References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 1. Existing Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2. Data supplied with this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3. Installation Drawings Used in the Preparation of this Service Bulletin. . . . . . . . . . . . 21 K. Publications Affected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 L. Interchangeability and Intermixability of Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2. MATERIAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 B. Industry Support Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 C. Parts Necessary For Each Airplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 1. Kits/Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2. Parts and Materials Supplied by the Operator. . . . . . . . . . . . . . . . . . . . . . . . 23 3. Parts Modified and Reidentified. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4. Parts Removed and Not Replaced. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 24 3. ACCOMPLISHMENT INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 A. GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 FIGURE 1: LEFT WING MAIN TANK ENGINE FUEL SPAR VALVE BODY - REPLACEMENT. . . . . 26 FIGURE 2: RIGHT WING MAIN TANK ENGINE FUEL SPAR VALVE BODY - REPLACEMENT. . . . 28

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 3 of 29 **BOEING SERVICE BULLETIN 737-28-1272**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 4 of 29 **BOEING SERVICE BULLETIN 737-28-1272**

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### Commercial **Airplane Group**  

# 737 Service Bulletin **Summary Number: 737-28-1272**  Date: October 31, 2008 ATA System: 2822 **SUBJECT:** FUEL - Engine Fuel Feed System - Main Tanks Engine Fuel Spar Valve Body Replacement **CONCURRENT REQUIREMENTS** None. **BACKGROUND** This service bulletin gives instructions to replace the engine fuel spar valves (ITT P/N 125334D-1) for the left and right main tanks, with ones that have a stronger and more wear resistant splined shaft on the disc portion of the valve (ITT P/N 125334D-2). The spar valves are located near the front of the spar of the left and right wings on the outboard side of the engine struts. Installation of the replacement valves will prevent occurrences of engine start failures. If this service bulletin is not done, engine spar valves could become unserviceable or not operate due to a fractured shaft on the disc portion of the valve.This disc could fail in either the closed, open position or partially open position. If the disc fails in the closed position, this will cause engine start problems. If the disc fails in the open position or partially open position, the flight deck crew can not detect this condition and the valve can not shutoff fuel flow if there were fuel leakage conditions on the engine side of the valve. If the valve is failed partially open, the pressure drop across the valve could affect takeoff suction feed performance if fuel pumps were to fail. One operator told Boeing of a failed engine start.The failed engine start occurrence was investigated and it was found that the related engine spar valve was unserviceable.The valve body was sent to Boeing for examination. The examination showed a fracture where the adapter shaft connects onto the male splined shaft of the disk portion of the valve through a universal joint. The engine fuel spar valves, made by ITT Aerospace Controls (ITT), are the same type that are used at the defuel and fuel cross feed valve locations and are also installed throughout the fuel system on 747, 757, 767 and 777 airplanes. Boeing and ITT have changed the design of the valve disc to reduce the stress level in the shaft and to prevent wear of the splined portion of the valve disc. The fuel pressure load path is changed from through the teeth on the splined shaft to through a larger diameter journal bearing on the valve disc.This change will prevent fractures caused by fuel system created pressure spikes which caused failures/fractures on the older design. By eliminating side loads on the splines, the wear on the splines will be prevented. The spline portion of the disc, with the change will only see torsional loading. A production design change installs the new spar valve bodies on subsequent 737NG airplanes.This production change will also update the crossfeed and defuel valves. Accomplishment of this service bulletin replaces the engine fuel spar valve bodies for the left and right main tanks. The replacement engine fuel spar valve bodies have a better design of the disk portion of the valve that has a stronger and more wear resistant splined shaft.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 5 of 29Boeing Service Related Problem (SRP) 737NG-SRP-28-0116 is related to this service bulletin. Boeing Fleet Team Digest (FTD) 737NG FTD 28-05002 and 737NG FTD 28-06004 are related to this service bulletin. **ACTION (PRR 38275-126S)** Get access to left and right main tank engine fuel spar valve bodies in the left and right wings. Replace each engine fuel spar valve body. Do a test of the engine fuel spar valves. **NO TE:**  Operators can modify the removed valve bodies as given in the related ITT Aerospace Controls service bulletin, or send the removed valve bodies back to ITT Aerospace Control to be modified, to make them the same as the new ITT part number 125334D-2 valve. **EFFECTIVITY** 737-600/700/700C/800/900/900ER Airplanes. Refer to Paragraph 1.A., Effectivity for the list of affected airplanes. **COMPLIANCE** Boeing recommends that the change given in this service bulletin is done within 5 years after the date on this service bulletin. 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. **INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are available for 737 airplanes in warranty as of September 21, 2006. Please refer to Paragraph 2.B., Industry Support Information. **MANPOWER Elapsed Hours**  **Total Task Hours Airplanes**  6.50 (a) 26.00 (a) Group 1 (a) Time estimated does not include the time to perform the work in the ITT Aerospace Controls service bulletin SB125334D-28-02.
**MATERIAL INFORMATION** Operator Supplied Parts. Refer to Paragraph 2.A., Material - Price and Availability.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 6 of 29 **BOEING SERVICE BULLETIN 737-28-1272**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 7 of 29 **BOEING SERVICE BULLETIN 737-28-1272**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 8 of 29 **BOEING SERVICE BULLETIN 737-28-1272**

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### Commercial **Airplane Group**  

# 737 Service Bulletin **Number: 737-28-1272** Date: October 31, 2008 ATA System: 2822 **SUBJECT:** FUEL - Engine Fuel Feed System - Main Tanks Engine Fuel Spar Valve Body Replacement **1. PLANNING INFORMATION A. Effectivity**  1. Airplanes Refer to Service Bulletin Index Document D6-19567 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 PRR 38275-126S for data about this change.
**DESCRIPTION CONFIGURATION**  **GROUP** 737-600/700/700C/800/900/900ER airplanes, Line Numbers 1 thru 2714. - 1

Airplane Models: 737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER **Group Variable Number**  1 YA001 - YA099 1 YA101 - YA199 1 YA201 - YA211 1 YA221 1 YA231 - YA242 1 YA251 - YA256 1 YA271 - YA272 1 YA291 1 YA301 - YA302 1 YA311 - YA314 1 YA321 - YA323

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 9 of 29**Group Variable Number**  1 YA336 - YA345 1 YA351 1 YA356 - YA357 1 YA366 - YA367 1 YA371 - YA377 1 YA501 - YA536 1 YA541 - YA552 1 YA571 - YA578 1 YA601 - YA615 1 YA621 - YA622 1 YA626 - YA631 1 YA635 - YA636 1 YA641 - YA642 1 YA645 - YA650 1 YA656 - YA659 1 YA666 - YA667 1 YA671 - YA672 1 YA681 - YA691 1 YA701 - YA710 1 YA721 - YA722 1 YA731 - YA734 1 YA751 - YA756 1 YA801 - YA803 1 YA809 1 YA811 - YA814 1 YA831 - YA835 1 YA841 - YA862 1 YA881 - YA882 1 YA891 - YA892 1 YA961 - YA978 1 YB001 - YB006 1 YB101 - YB132 1 YB151 - YB153

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 10 of 29 **BOEING SERVICE BULLETIN 737-28-1272 Group**  **Variable Number** 1 YB156 - YB158 1 YB161 - YB164 1 YB171 - YB172 1 YB181 - YB184 1 YB201 - YB208 1 YB271 1 YB276 1 YB301 - YB310 1 YB371 - YB392 1 YB501 - YB502 1 YB521 - YB526 1 YB541 - YB544 1 YB551 1 YB561 - YB598 1 YB601 - YB632 1 YB651 1 YB656 1 YB671 - YB672 1 YB851 - YB863 1 YB871 - YB874 1 YB881 - YB893 1 YB901 - YB903 1 YB911 1 YB961 - YB974 1 YB986 - YB987 1 YC001 - YC030 1 YC051 - YC084 1 YC091 - YC094 1 YC101 - YC104 1 YC111 - YC113 1 YC121 1 YC126 - YC127 1 YC136 - YC141

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 11 of 29 **BOEING SERVICE BULLETIN 737-28-1272 Group**  **Variable Number** 1 YC146 - YC147 1 YC151 - YC156 1 YC166 - YC171 1 YC176 - YC179 1 YC186 - YC190 1 YC201 - YC203 1 YC206 - YC207 1 YC301 - YC305 1 YC321 - YC387 1 YC391 - YC394 1 YC396 1 YC401 - YC417 1 YC421 - YC422 1 YC426 - YC428 1 YC436 - YC439 1 YC441 - YC448 1 YC451 - YC455 1 YC459 1 YC461 - YC467 1 YC471 - YC499 1 YC501 - YC526 1 YC571 - YC583 1 YC587 - YC589 1 YC591 - YC593 1 YC601 - YC655 1 YC681 - YC696 1 YC701 - YC715 1 YC720 - YC725 1 YC727 - YC752 1 YC761 - YC770 1 YC781 - YC793 1 YC801 - YC892 1 YC901 - YC907

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 12 of 29 **BOEING SERVICE BULLETIN 737-28-1272 Group**  **Variable Number** 1 YC921 - YC922 1 YC931 - YC932 1 YC941 - YC951 1 YC971 - YC978 1 YC981 - YC983 1 YD001 - YD007 1 YD021 - YD025 1 YD041 - YD057 1 YD081 - YD084 1 YD101 - YD110 1 YD121 - YD126 1 YD151 - YD159 1 YD171 - YD172 1 YD201 - YD203 1 YD206 - YD209 1 YD216 - YD219 1 YD251 - YD254 1 YD256 - YD257 1 YD261 1 YD301 - YD334 1 YD391 1 YD401 - YD410 1 YD412 - YD415 1 YD481 - YD485 1 YD491 - YD499 1 YD501 - YD512 1 YD531 - YD535 1 YD541 - YD547 1 YD561 - YD564 1 YD571 - YD572 1 YD591 - YD595 1 YD601 - YD612 1 YD651 - YD655

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 13 of 29 **BOEING SERVICE BULLETIN 737-28-1272 Group**  **Variable Number** 1 YE001 - YE020 1 YE051 1 YE101 - YE109 1 YE151 - YE157 1 YE171 - YE172 1 YE201 - YE206 1 YE301 - YE305 1 YE321 - YE326 1 YE371 - YE383 1 YF001 1 YF021 - YF026 1 YF051 - YF052 1 YF086 1 YF106 - YF107 1 YF111 1 YF176 - YF178 1 YG001 - YG044 1 YG061 - YG064 1 YG066 - YG089 1 YG091 - YG099 1 YG101 - YG103 1 YG111 - YG114 1 YG116 - YG120 1 YG201 - YG205 1 YG211 - YG214 1 YG251 - YG252 1 YG501 - YG509 1 YG601 - YG602 1 YG701 1 YG711 1 YH001 - YH012 1 YH051 - YH054 1 YH101 - YH115

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 14 of 29 **BOEING SERVICE BULLETIN 737-28-1272 Group**  **Variable Number** 1 YH201 - YH202 1 YH206 - YH207 1 YH301 1 YJ001 - YJ013 1 YJ021 1 YJ471 - YJ480 1 YJ501 - YJ517 1 YJ531 - YJ567 1 YJ591 - YJ597 1 YJ631 - YJ632 1 YJ671 - YJ694 1 YJ801 - YJ867 1 YJ871 - YJ875 1 YJ901 - YJ904 1 YJ908 1 YJ911 - YJ929 1 YJ931 - YJ937 1 YJ941 - YJ956 1 YJ976 - YJ977 1 YK001 - YK007 1 YK101 - YK104 1 YK111 - YK112 1 YK121 - YK122 1 YK131 - YK133 1 YK136 - YK139 1 YK141 - YK142 1 YK146 - YK148 1 YK151 - YK154 1 YK161 - YK167 1 YK171 1 YK176 1 YK301 - YK309 1 YK321 - YK339

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 15 of 29 **BOEING SERVICE BULLETIN 737-28-1272 Group**  **Variable Number** 1 YK361 - YK375 1 YK401 - YK406 1 YK426 - YK427 1 YK431 - YK450 1 YK456 - YK460 1 YK476 1 YK480 - YK485 1 YK495 1 YK511 - YK516 1 YK521 - YK523 1 YK551 - YK571 1 YK576 - YK577 1 YK580 - YK585 1 YK601 - YK602 1 YK606 - YK607 1 YK611 - YK616 1 YK621 - YK627 1 YK631 - YK634 1 YK641 - YK644 1 YK651 - YK661 1 YK671 1 YK701 - YK712 1 YK716 - YK719 1 YK721 - YK741 1 YK751 - YK760 1 YK791 - YK792 1 YK796 - YK797 1 YK801 - YK887 1 YK901 - YK911 1 YK918 1 YK921 - YK927 1 YK941 - YK952 1 YK961 - YK971

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 16 of 29 **BOEING SERVICE BULLETIN 737-28-1272 Group**  **Variable Number** 1 YK981 - YK985 1 YL001 - YL005 1 YL011 - YL016 1 YL021 - YL024 1 YL051 - YL052 1 YL056 - YL057 1 YL061 1 YL066 - YL069 1 YL076 - YL077 1 YL101 - YL117 1 YL201 - YL209 1 YL271 - YL272 1 YL281 - YL282 1 YL301 - YL303 1 YL311 - YL312 1 YL316 - YL319 1 YL371 - YL373 1 YL421 - YL426 1 YL431 - YL437 1 YL461 - YL473 1 YL501 - YL505 1 YL531 - YL534 1 YL561 - YL565 1 YL591 - YL592 1 YL601 - YL606 1 YL611 1 YL616 1 YL621 1 YL661 - YL664 1 YL901 - YL907 1 YL931 - YL933 1 YL951 - YL952 1 YM101 - YM103

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 17 of 29 **BOEING SERVICE BULLETIN 737-28-1272 Group**  **Variable Number** 1 YM201 - YM238 1 YM251 - YM299 1 YM301 - YM374 1 YM471 1 YM481 - YM484 1 YM501 - YM515 1 YM521 - YM522 1 YM541 1 YM551 - YM553 1 YM571 - YM572 1 YM581 - YM582 1 YM591 - YM593 1 YM631 - YM634 1 YM641 - YM651 1 YM671 - YM672 1 YM691 - YM693 1 YM701 - YM702 1 YN001 - YN016 1 YN021 - YN024 1 YN061 1 YN071 - YN079 1 YN091 - YN092 1 YN101 - YN112 1 YN121 1 YN201 1 YN211 - YN216 1 YN231 - YN232 2. Spares Affected Examine your spares supply for the parts or components identified in Paragraph 2.C., Parts Necessary for Each Airplane. If any parts or components are found, refer to Paragraph 2.C. for the recommended use. **B. Concurrent Requirements** None.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 18 of 29 **BOEING SERVICE BULLETIN 737-28-1272 C. Reason**  This service bulletin gives instructions to replace the engine fuel spar valves (ITT P/N 125334D-1) for the left and right main tanks, with ones that have a stronger and more wear resistant splined shaft on the disc portion of the valve (ITT P/N 125334D-2). The spar valves are located near the front of the spar of the left and right wings on the outboard side of the engine struts. Installation of the replacement valves will prevent occurrences of engine start failures. If this service bulletin is not done, engine spar valves could become unserviceable or not operate due to a fractured shaft on the disc portion of the valve. This disc could fail in either the closed, open position or partially open position. If the disc fails in the closed position, this will cause engine start problems. If the disc fails in the open position or partially open position, the flight deck crew can not detect this condition and the valve can not shutoff fuel flow if there were fuel leakage conditions on the engine side of the valve. If the valve is failed partially open, the pressure drop across the valve could affect takeoff suction feed performance if fuel pumps were to fail. One operator told Boeing of a failed engine start. The failed engine start occurrence was investigated and it was found that the related engine spar valve was unserviceable. The valve body was sent to Boeing for examination. The examination showed a fracture where the adapter shaft connects onto the male splined shaft of the disk portion of the valve through a universal joint. The engine fuel spar valves, made by ITT Aerospace Controls (ITT), are the same type that are used at the defuel and fuel cross feed valve locations and are also installed throughout the fuel system on 747, 757, 767 and 777 airplanes. Boeing and ITT have changed the design of the valve disc to reduce the stress level in the shaft and to prevent wear of the splined portion of the valve disc. The fuel pressure load path is changed from through the teeth on the splined shaft to through a larger diameter journal bearing on the valve disc. This change will prevent fractures caused by fuel system created pressure spikes which caused failures/fractures on the older design. By eliminating side loads on the splines, the wear on the splines will be prevented. The spline portion of the disc, with the change will only see torsional loading. A production design change installs the new spar valve bodies on subsequent 737NG airplanes. This production change will also update the crossfeed and defuel valves. Accomplishment of this service bulletin replaces the engine fuel spar valve bodies for the left and right main tanks. The replacement engine fuel spar valve bodies have a better design of the disk portion of the valve that has a stronger and more wear resistant splined shaft. Boeing Service Related Problem (SRP) 737NG-SRP-28-0116 is related to this service bulletin. Boeing Fleet Team Digest (FTD) 737NG FTD 28-05002 and 737NG FTD 28-06004 are related to this service bulletin. **D. Description** Get access to the left and right main tank engine fuel spar valve bodies in the left and right wings. Replace each engine fuel spar valve body. Do a test of the engine fuel spar valves. **NO TE:**  Operators can modify the removed valve bodies as given in the related ITT Aerospace Controls service bulletin, or send the removed valve bodies back to ITT Aerospace Controls (see below for address information) to be modified, to make them the same as the new ITT part number 125334D-2 valve.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 19 of 29 **BOEING SERVICE BULLETIN 737-28-1272**ITT Corporation (Cage Code 73760), ITT Aerospace Controls, 28150 Industry Dr, Valencia, CA 91355, USA, Telephone: 661-295-4000, Fax; 661-294-1750, website; www.ittaerospace.com. The work in this service bulletin is done in the maintenance zone(s) given below.
**Affected Maintenance Zones Zone**  **Model** 532, 632 737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER **E. Compliance** Boeing recommends that the change given in this service bulletin is done within 5 years after the date on this service bulletin. 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. **F. Approval** This service bulletin was examined by the Federal Aviation Administration (FAA).The changes specified in this service bulletin comply with the applicable regulations and are FAA approved, as well as European Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in the service bulletin effectivity. This service bulletin and its approval were based on the airplane in its original Boeing delivery configuration or as modified by other approved Boeing changes. If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before incorporating this service bulletin. **G. Manpower** The table below shows an estimate of the task hours necessary to do this service bulletin for each airplane. This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator task hour data if necessary.The estimate does not include lost time.These are some examples of lost time: • Time to adjust to the workplace • Time to schedule the work • Time to inspect the work • Time to cure the materials • Time to make the parts • Time to find the tools. **Elapsed Hours Task Hours**  **Number of Persons**  **Task**

3.25 13.00 4 FIGURE 1

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 20 of 29 **BOEING SERVICE BULLETIN 737-28-1272 Elapsed Hours**  **Task Hours Number of**  **Persons Task** 

3.25 13.00 4 FIGURE 2 6.50 (a) 26.00 (a) TOTAL FOR EACH AIRPLANE (a) Time estimated does not include the time to perform the work in the ITT Aerospace Controls service bulletin SB125334D-28-02. **H. Weight and Balance Changes** None. **I. Electrical Load Data** Not changed. **J. References** 1. Existing Data a. Engineering Change Memo PRR 38275-126S. b. Boeing Service Related Problem (SRP) 737NG-SRP-28-0116. c. Boeing Fleet Team Digest (FTD) 737NG FTD 28-05002 and 737NG FTD 28-06004. d. 737-600/700/800/900 Aircraft Maintenance Manual (AMM) 28-22-00, 28-22-11. e. ITT Aerospace Controls Service Bulletin SB125334D-28-02. **NO TE:**  The supplier was told to send copies of the service bulletin to each operator. 2. Data supplied with this Service Bulletin None. 3. Installation Drawings Used in the Preparation of this Service Bulletin None. **K. Publications Affected Chapter-Section** 

**Publication** 28-22 737-600/700/700C/800/900 Illustrated Parts Catalog **L. Interchangeability and Intermixability of Parts** Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability information.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 21 of 29 **BOEING SERVICE BULLETIN 737-28-1272**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 22 of 29 **BOEING SERVICE BULLETIN 737-28-1272**

BLANK PAGE**2. MATERIAL INFORMATION A. Material - Price and Availability**  The operator can supply the parts and materials shown in Paragraph 2.C., Parts Necessary for Each Airplane , and Paragraph 2.D., Parts Necessary to Change Spares. **B. Industry Support Information** Boeing warranty remedies are available for 737 airplanes in warranty as of September 21, 2006. Please refer to the ITT Aerospace Controls service bulletin for modification instructions. For removal and replacement labor hour reimbursement for airplanes in warranty as of that date, send a claim to Boeing warranty. **C. Parts Necessary For Each Airplane** 1. Kits/Parts None. 2. Parts and Materials Supplied by the Operator
**Notes Existing Boeing Part**  **Number (Existing ITT Part Number)**  **Name QTY**  **New Boeing Part Number (New ITT**  **Part Number)** (a) (b) (c) (d) S343T003-40 (125334D-1) Valve Body 2 S343T003-67 (125334D-2) (a) The quantity given is the number of valves bodies necessary for the left and right main fuel tanks. (b) The new part can be purchased from: ITT Corporation (Cage Code 73760), ITT Aerospace Controls, 28150 Industry Dr, Valencia, CA 91355, USA; Telephone 661-295-4000, Fax; 661-294-1750, website; www.ittaerospace.com. (c) You cannot use the existing part (125334D-1) to replace the new or changed part (125334D-2). (d) Removed S343T003-40 valve bodies can be modified as given in ITT Aerospace Controls service bulletin SB125334D-28-02, to make them the same as the new S343T003-67 valve bodies. Or, the removed S343T003-40 valve bodies can be sent back to ITT Aerospace Controls to be modified, to make them the same as the new S343T003-67 valve bodies.
3. Parts Modified and Reidentified Refer to ITT Aerospace Controls service bulletin SB125334D-28-02. 4. Parts Removed and Not Replaced None. **D. Parts Necessary to Change Spares** Refer to ITT Aerospace Controls service bulletin SB125334D-28-02.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 23 of 29 **BOEING SERVICE BULLETIN 737-28-1272 E. Special Tooling - Price and Availability**  None. **F. Special Tooling Necessary to do this Service Bulletin** No special tools or equipment are necessary to do the change in this service bulletin. But, maintenance and overhaul tools in the manuals given in Paragraph 1.J., References, can be necessary. Examine operator tool supply to make sure all necessary tools are available.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 24 of 29 **BOEING SERVICE BULLETIN 737-28-1272 3. ACCOMPLISHMENT INSTRUCTIONS**  **A. GENERAL INFORMATION CA** **UTION:** KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL, METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR OTHER ELECTRICAL DAMAGE. **NO TE:**  1. The instructions identified in Paragraph 3.B., Work Instructions and the Figure(s) give the recommended sequence of steps. The sequence of steps to do this service bulletin can be changed. 2. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for definition of the acronyms. 3. Obey all of the warnings and cautions given in the specified manual sections. 4. These work instructions refer to procedures included in other Boeing documents. When the words "refer to" are used and the operator has an accepted alternative procedure, the accepted alternative procedure can be used. When the words "in accordance with" are included in the instruction, the procedure in the Boeing document must be used. **B. WORK INSTRUCTIONS** 1. Replace the engine fuel spar valve body of the left wing main tank in accordance with FIGURE 1. **NO TE:**  Operators can modify the removed S343T003-40 valve body in accordance with ITT Aerospace Controls service bulletin SB125334D-28-02, to make it the new S343T003-67 valve body. Or, the removed S343T003-40 valve body can be sent back to ITT Aerospace Controls to be modified to make it the new S343T003-67 valve body. 2. Replace the engine fuel spar valve body of the right wing main tank in accordance with FIGURE 2. **NO TE:**  Operators can modify the removed S343T003-40 valve body in accordance with ITT Aerospace Controls service bulletin SB125334D-28-02, to make it the new S343T003-67 valve body. Or, the removed S343T003-40 valve body can be sent back to ITT Aerospace Controls to be modified to make it the new S343T003-67 valve body. 3. Put the airplane back to a serviceable condition.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 25 of 29 **BOEING SERVICE BULLETIN 737-28-1272 FIGURE 1: LEFT WING MAIN TANK ENGINE FUEL SPAR VALVE BODY - REPLACEMENT**  **(SHEET 1 OF 2)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 26 of 29 **BOEING SERVICE BULLETIN 737-28-1272**The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for the left main tank.
**MORE DATA QTY**  **IDENTIFICATION NAME**  **TASK STEP**  (a) (b) 1 S343T003-40 VALVE BODY Remove 1 (a) (b) 1 S343T003-67 VALVE BODY Install (New) 2 (a) For valve body removal/installation, electrical bonding, and test. Refer to 737-600/700/800/900 AMM 28-22-11 as an accepted procedure. (b) The part number of the valve body identified is the Boeing part number. Refer to Paragraph 2.C.2., Parts and Materials Supplied by the Operator to get the equivalent ITT Aerospace Controls part number.

**FIGURE 1: LEFT WING MAIN TANK ENGINE FUEL SPAR VALVE BODY - REPLACEMENT (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 27 of 29 **BOEING SERVICE BULLETIN 737-28-1272 FIGURE 2: RIGHT WING MAIN TANK ENGINE FUEL SPAR VALVE BODY - REPLACEMENT**  **(SHEET 1 OF 2)**

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 28 of 29 **BOEING SERVICE BULLETIN 737-28-1272**The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for the right main tank.
**MORE DATA QTY**  **IDENTIFICATION NAME**  **TASK STEP**  (a) (b) 1 S343T003-40 VALVE BODY Remove 1 (a) (b) 1 S343T003-67 VALVE BODY Install (New) 2 (a) For valve body removal/installation, electrical bonding, and test. Refer to 737-600/700/800/900 AMM 28-22-11 as an accepted procedure. (b) The part number of the valve body identified is the Boeing part number. Refer to Paragraph 2.C.2., Parts and Materials Supplied by the Operator to get the equivalent ITT Aerospace Controls part number.

**FIGURE 2: RIGHT WING MAIN TANK ENGINE FUEL SPAR VALVE BODY - REPLACEMENT (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. October 31, 2008 737-28-1272 29 of 29 **BOEING SERVICE BULLETIN 737-28-1272**