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.

ECCN: 9E991

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Unpublished Work - All Rights Reserved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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.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

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3.0
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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

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BOEING SERVICE BULLETIN 737-28-1272
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BOEING SERVICE BULLETIN 737-28-1272

BLANK PAGE
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

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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.

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.

NOTE: 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

Airplanes Total Task Hours Elapsed Hours

Group 1 26.00 (a) 6.50 (a)

(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.

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BOEING SERVICE BULLETIN 737-28-1272
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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BOEING SERVICE BULLETIN 737-28-1272
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BOEING SERVICE BULLETIN 737-28-1272

BLANK PAGE
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.

GROUP CONFIGURATION DESCRIPTION

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

Variable Number Group

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 1

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October 31, 2008

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Variable Number Group

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 1

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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BOEING SERVICE BULLETIN 737-28-1272
Variable Number Group

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 1

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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BOEING SERVICE BULLETIN 737-28-1272
Variable Number Group

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 1

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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BOEING SERVICE BULLETIN 737-28-1272
Variable Number Group

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 1

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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BOEING SERVICE BULLETIN 737-28-1272
Variable Number Group

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 1

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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BOEING SERVICE BULLETIN 737-28-1272
Variable Number Group

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 1

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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BOEING SERVICE BULLETIN 737-28-1272
Variable Number Group

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 1

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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BOEING SERVICE BULLETIN 737-28-1272
Variable Number Group

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 1

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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BOEING SERVICE BULLETIN 737-28-1272
Variable Number Group

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 1

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

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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.

NOTE: 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

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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

Model Zone

737-600, 737-700, 737-700C, 532, 632

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.

Number of Task Hours Elapsed Hours

Persons

Task

FIGURE 1 4 13.00 3.25

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Number of Task Hours Elapsed Hours

Persons

Task

FIGURE 2 4 13.00 3.25

TOTAL FOR EACH AIRPLANE 26.00 (a) 6.50 (a)

(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.

NOTE: 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

Publication Chapter-Section

737-600/700/700C/800/900 Illustrated Parts Catalog 28-22

L. Interchangeability and Intermixability of Parts

Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability

information.

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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

Existing Boeing Part Notes

Number (Existing ITT Part

Number)

New Boeing Part QTY Name

Number (New ITT

Part Number)

S343T003-67 2 Valve Body S343T003-40 (125334D-1) (a) (b) (c) (d)

(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.

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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.

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3. ACCOMPLISHMENT INSTRUCTIONS

A. GENERAL INFORMATION

CAUTION: 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.

NOTE: 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.

NOTE: 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.

NOTE: 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.

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FIGURE 1: LEFT WING MAIN TANK ENGINE FUEL SPAR VALVE BODY - REPLACEMENT

(SHEET 1 OF 2)

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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.

STEP TASK NAME IDENTIFICATION QTY MORE DATA

1 Remove VALVE BODY S343T003-40 1 (a) (b)

2 Install (New) VALVE BODY S343T003-67 1 (a) (b)

(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)

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FIGURE 2: RIGHT WING MAIN TANK ENGINE FUEL SPAR VALVE BODY - REPLACEMENT

(SHEET 1 OF 2)

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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.

STEP TASK NAME IDENTIFICATION QTY MORE DATA

1 Remove VALVE BODY S343T003-40 1 (a) (b)

2 Install (New) VALVE BODY S343T003-67 1 (a) (b)

(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)

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