### Commercial **Airplanes** 

# 747 Service Bulletin **ALERT Number: 747-28A2331**  Original Issue: April 02, 2012 ATA System: 2822 **SUBJECT:** FUEL - Engine Fuel Feed System - Engine Fuel Suction Feed Operational Test 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. 9E991 ECCN: 

## BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2012 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 Unpublished Work.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, DreamlinerTM, BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and 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. BOEING is a trademark of Boeing Management Company.

Original Issue: April 02, 2012 747-28A2331 1 of 29 5.0Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 2 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**

BLANK PAGE**Table of Contents** Summary...................................................... 5 1. PLANNING INFORMATION ........................................ 9 A. Effectivity................................................ 9 1. Airplanes............................................. 9 2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 B. Concurrent Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 C. Reason. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 D. Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 H. Weight and Balance Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 I. Electrical Load Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 J. References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2. Data Supplied with this Service Bulletin:. . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3. Installation Drawings Used in the Preparation of this Service Bulletin:. . . . . . . . . . . 19 K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 L. Interchangeability and Intermixability of Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . 20 M. Software Accomplishment Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2. MATERIAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 C. Parts Necessary for Each Airplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 1. Kits/Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2. Parts and Materials Supplied by the Operator. . . . . . . . . . . . . . . . . . . . . . . . 21 3. Parts Modified and Reidentified. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4. Parts Removed and Not Replaced. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 21 3. ACCOMPLISHMENT INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 A. GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 3 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 4 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**

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### Commercial **Airplanes** 

# 747 Service Bulletin **ALERT Summary**  **Number: 747-28A2331** Original Issue: April 02, 2012 ATA System: 2822 **SUBJECT:** FUEL - Engine Fuel Feed System - Engine Fuel Suction Feed Operational Test THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER. **CONCURRENT REQUIREMENTS** None. **BACKGROUND** This service bulletin provides instructions to operators to perform an Engine Fuel Suction Feed Operational Test on each engine individually. This test is required in order to protect against engine flameout during suction feed operations. The instructions given in this service bulletin are provided to detect and correct failure of the engines fuel suction feed of the fuel system, which could result in dual engine flameout and inability to restart the engines, and consequent forced landing of the airplane. Accomplishing the fuel system suction feed test and continuing to repeat the testing within the specified compliance times will reduce the possibility of an engine flameout resulting from air ingestion into the engine fuel feed system during low fuel level conditions with inoperative boost pumps . An operator reported a 737-400 Engine No. 1 flameout during cruise. The Engine No. 2 continued to operate normally. The flight crew conducted two restart attempts within the start envelope with no success then diverted uneventfully. Another operator reported a 737-300 Engine No. 2 shut down when the start lever was placed in the idle position during taxi to the gate. The Engine number 1 continued to operate normally. Maintenance performed a vacuum test of the engine fuel feed system and found a crack in a fuel feed tube. The fuel feed tube was replaced and the vacuum test of the fuel feed system was performed and passed successfully. This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
**Reference Affected**  **Planning Data** Paragraph 1.E., Compliance Yes AD Related
**ACTION** The WORK PACKAGES can be done in any order.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 5 of 29Each engine must successfully complete the Fuel Suction Feed - Operational Test. **WORK PACKAGE 1 - ENGINE NO. 1 - FUEL SUCTION FEED - OPERATIONAL TEST** 1. Do the Engine No. 1 - Fuel Suction Feed - Operational Test. 2. If the Fuel Suction Feed Operational Test fails isolate the cause of the leak, repair, and repeat the test. **WORK PACKAGE 2 - ENGINE NO. 2 - FUEL SUCTION FEED - OPERATIONAL TEST** 1. Do the Engine No. 2 - Fuel Suction Feed - Operational Test. 2. If the Fuel Suction Feed Operational Test fails isolate the cause of the leak, repair, and repeat the test. **WORK PACKAGE 3 - ENGINE NO. 3 - FUEL SUCTION FEED - OPERATIONAL TEST** 1. Do the Engine No. 3 - Fuel Suction Feed - Operational Test. 2. If the Fuel Suction Feed Operational Test fails isolate the cause of the leak, repair, and repeat the test. **WORK PACKAGE 4 - ENGINE NO. 4 - FUEL SUCTION FEED - OPERATIONAL TEST** 1. Do the Engine No. 4 - Fuel Suction Feed - Operational Test. 2. If the Fuel Suction Feed Operational Test fails isolate the cause of the leak, repair, and repeat the test. **EFFECTIVITY** 747-100/-100B/-100B SUD/-200B/200C/-200F/-300/747SP/747SR Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s). **COMPLIANCE** The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory. Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2007-NM-356-AD, is related to this service bulletin. Boeing recommends that the Engine Suction Fuel Feed Operational Test given in this service bulletin be done 30,000 Flight Hours after the original issue date of this service bulletin. **INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are not available for the Operational Test given in this service bulletin. **MANPOWER** Refer to Paragraph 1.G., Manpower.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 6 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT MATERIAL INFORMATION**  None.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 7 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 8 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**

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### Commercial **Airplanes** 

# 747 Service Bulletin **ALERT Number: 747-28A2331**  Original Issue: April 02, 2012 ATA System: 2822 **SUBJECT:** FUEL - Engine Fuel Feed System - Engine Fuel Suction Feed Operational Test THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER. **1. PLANNING INFORMATION A. Effectivity**  1. Airplanes This service bulletin is for the airplane(s) shown below. Refer to Service Bulletin Index D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
**DESCRIPTION CONFIGURATION**  **GROUP** 747-100, 100B, -100 SUD, -200B, -200C, -200F, -300, 747SP and 747SR airplanes - 1

Airplane Models: 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SP, 747SR **Group Variable Number**  1 RA001 - RA034 1 RA101 - RA115 1 RA161 - RA164 1 RA201 - RA203 1 RA216 - RA217 1 RA245 - RA246

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 9 of 29**Group Variable Number**  1 RA251 - RA266 1 RA301 - RA318 1 RA351 - RA360 1 RA369 - RA373 1 RA401 - RA418 1 RA501 - RA502 1 RA521 - RA528 1 RA532 - RA548 1 RA551 - RA552 1 RA559 - RA561 1 RA581 - RA582 1 RA585 1 RA601 - RA602 1 RA631 - RA635 1 RA651 - RA652 1 RA671 - RA677 1 RA701 - RA702 1 RA721 - RA731 1 RA741 - RA745 1 RA749 - RA750 1 RA761 - RA762 1 RA781 - RA784 1 RA901 - RA916 1 RB001 - RB016 1 RB041 - RB044 1 RB071 - RB075 1 RB101 - RB102 1 RB411 - RB413 1 RB421 1 RB601 - RB607 1 RB681 - RB697 1 RB711 1 RB721 - RB723

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 10 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT Group**  **Variable Number** 1 RB741 - RB748 1 RD001 - RD004 1 RD021 - RD022 1 RD041 - RD059 1 RD071 - RD072 1 RD081 - RD083 1 RD091 - RD092 1 RD101 - RD104 1 RD121 - RD127 1 RD131 - RD144 1 RD166 - RD167 1 RD171 - RD172 1 RD181 - RD183 1 RD201 - RD204 1 RD221 - RD227 1 RD231 - RD235 1 RD241 - RD243 1 RD251 - RD262 1 RD271 - RD272 1 RD291 - RD292 1 RD301 - RD302 1 RD311 1 RD351 - RD358 1 RD361 - RD366 1 RD381 - RD383 1 RD411 - RD414 1 RD421 - RD426 1 RD431 - RD435 1 RD441 - RD442 1 RD451 - RD456 1 RD461 1 RD471 - RD475 1 RD513 - RD519

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 11 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT Group**  **Variable Number** 1 RD531 - RD533 1 RD551 1 RD561 1 RD571 1 RD581 - RD583 1 RD591 - RD593 1 RD601 - RD607 1 RD621 - RD623 1 RD641 - RD649 1 RD651 - RD659 1 RD661 1 RD671 1 RD681 - RD682 1 RD691 - RD692 1 RD701 - RD702 1 RD721 - RD722 1 RD741 - RD742 1 RD751 - RD755 1 RD761 1 RD771 - RD775 1 RD781 - RD783 1 RD791 - RD792 1 RE001 1 RG001 - RG009 1 RG091 1 RG095 1 RG101 - RG104 1 RG121 - RG126 1 RG141 - RG142 1 RG161 - RG164 1 RG171 - RG174 1 RG191 - RG193 1 RG211 - RG213

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 12 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT Group**  **Variable Number** 1 RG221 - RG222 1 RH101 - RH102 1 RH111 - RH112 1 RH121 - RH122 1 RJ131 - RJ133 1 RJ151 - RJ152 1 RJ301 - RJ303 1 RJ321 - RJ322 1 RJ331 - RJ333 1 RR001 - RR005 1 RR021 - RR025 1 RR031 1 RR201 - RR206 1 RR221 - RR226 1 RR261 - RR267 1 RR301 - RR310 1 RR331 - RR332 1 RR336 1 RR341 - RR345 1 RR361 - RR362 1 RR421 - RR422 1 RR431 - RR432 1 RR441 - RR442 1 RR451 1 RR501 - RR504 1 RR521 - RR522 1 RR526 1 RR531 1 RR551 - RR556 1 RR561 1 RR566 1 RS001 - RS002 1 RS201

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 13 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT Group**  **Variable Number** 1 RS211 - RS212 1 RS221 - RS222 1 RS231 - RS241 1 RS251 - RS259 1 RS263 1 RS265 - RS268 1 RS271 - RS276 1 RS291 - RS292 1 RS301 - RS306 1 RS311 - RS320 1 RS331 - RS333 1 RS341 - RS342 1 RS699 1 RS701 - RS703 1 RS711 - RS713 1 RS721 - RS722 1 RS731 - RS732 1 RS741 - RS743 1 RS751 - RS752 1 RS761 - RS762 1 RS771 1 RS781 - RS782 1 RS786 2. Spares Affected None. **B. Concurrent Requirements** None. **C. Reason** This service bulletin provides instructions to operators to perform an Engine Fuel Suction Feed Operational Test on each engine individually. This test is required in order to protect against engine flameout during suction feed operations. The instructions given in this service bulletin are provided to detect and correct failure of the engines fuel suction feed of the fuel system, which could result in dual engine flameout and inability to restart the engines, and consequent forced landing of the airplane.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 14 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**Accomplishing the fuel system suction feed test and continuing to repeat the testing within the specified compliance times will reduce the possibility of an engine flameout resulting from air ingestion into the engine fuel feed system during low fuel level conditions with inoperative boost pumps . An operator reported a 737-400 Engine No. 1 flameout during cruise. The Engine No. 2 continued to operate normally. The flight crew conducted two restart attempts within the start envelope with no success then diverted uneventfully. Another operator reported a 737-300 Engine No. 2 shut down when the start lever was placed in the idle position during taxi to the gate. The Engine number 1 continued to operate normally. Maintenance performed a vacuum test of the engine fuel feed system and found a crack in a fuel feed tube. The fuel feed tube was replaced and the vacuum test of the fuel feed system was performed and passed successfully. **D. Description** The work packages can be done in any order. **WORK PACKAGE 1 - ENGINE NO. 1 - FUEL SUCTION FEED - OPERATIONAL TEST** 1. Do the Engine No. 1 - Fuel Suction Feed - Operational Test. 2. If the Fuel Suction Feed Operational Test fails isolate the cause of the leak, repair, and repeat the test. **WORK PACKAGE 2 - ENGINE NO. 2 - FUEL SUCTION FEED - OPERATIONAL TEST** 1. Do the Engine No. 2 - Fuel Suction Feed - Operational Test. 2. If the Fuel Suction Feed Operational Test fails isolate the cause of the leak, repair, and repeat the test. **WORK PACKAGE 3 - ENGINE NO. 3 - FUEL SUCTION FEED - OPERATIONAL TEST** 1. Do the Engine No. 3 - Fuel Suction Feed - Operational Test. 2. If the Fuel Suction Feed Operational Test fails isolate the cause of the leak, repair, and repeat the test. **WORK PACKAGE 4 - ENGINE NO. 4 - FUEL SUCTION FEED - OPERATIONAL TEST** 1. Do the Engine No. 4 - Fuel Suction Feed - Operational Test. 2. If the Fuel Suction Feed Operational Test fails isolate the cause of the leak, repair, and repeat the test. The work in this service bulletin is done in the maintenance zone(s) given below.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 15 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT Affected Maintenance Zones**  **Zone Model**  221, 222 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SP, 747SR **E. Compliance** Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2007-NM-356-AD, is related to 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. **Table 1: ENGINE NO. 1 - FUEL SUCTION FEED - OPERATIONAL TEST Repeat Interval**  **(Not to Exceed) Compliance Time**  **Action Condition**  30,000 flight hours Within 30,000 flight hours after the original issue dateof this service bulletin. Do the Engine No. 1 FuelSuction Feed - Operational Test in accordancewith Accomplishment Instructions, paragraph 3.B., Work Instructions, Work Package 1. All Airplanes

- Before Further Flight Isolate the cause of the leak, repair, and repeat the Engine Fuel Suction Feed - Operational Testin accordance with Accomplishment Instructions, paragraph 3.B., Work Instructions, Work Package 1 If the Engine No. 1 Fuel Suction Feed Operation Test fails

**Table 2: ENGINE NO. 2 - FUEL SUCTION FEED - OPERATIONAL TEST Repeat Interval**  **(Not to Exceed) Compliance Time**  **Action Condition**  30,000 flight hours Within 30,000 flight hours after the original issue dateof this service bulletin. Do the Engine No. 2 FuelSuction Feed - Operational Test in accordancewith Accomplishment Instructions, paragraph 3.B., Work Instructions, Work Package 2. All airplanes

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 16 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT Table 2: ENGINE NO. 2 - FUEL SUCTION FEED - OPERATIONAL TEST** **Repeat Interval (Not to Exceed)**  **Compliance Time Action**  **Condition**

- Before Further Flight Isolate the cause of the leak, repair, and repeat the Engine Fuel Suction Feed - Operational Testin accordance with Accomplishment Instructions, paragraph 3.B., Work Instructions, Work Package 2. If the Engine No. 2 Fuel Suction Feed Operation Test fails

**Table 3: ENGINE NO. 3 - FUEL SUCTION FEED - OPERATIONAL TEST Repeat Interval**  **(Not to Exceed) Compliance Time**  **Action Condition**  30,000 flight hours Within 30,000 flight hours after the original issue dateof this service bulletin. Do the Engine No. 3 FuelSuction Feed - Operational Test in accordancewith Accomplishment Instructions, paragraph 3.B., Work Instructions, Work Package 3. All airplanes

- Before Further Flight Isolate the cause of the leak, repair, and repeat the Engine Fuel Suction Feed - Operational Testin accordance with Accomplishment Instructions, paragraph 3.B., Work Instructions, Work Package 3. If the Engine No. 3 Fuel Suction Feed Operation Test fails

**Table 4: ENGINE NO. 4 - FUEL SUCTION FEED - OPERATIONAL TEST Repeat Interval**  **(Not to Exceed) Compliance Time**  **Action Condition**  30,000 flight hours Within 30,000 flight hours after the original issue dateof this service bulletin. Do the Engine No. 4 FuelSuction Feed - Operational Test in accordancewith Accomplishment Instructions, paragraph 3.B., Work Instructions, Work Package 4. All airplanes

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 17 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT Table 4: ENGINE NO. 4 - FUEL SUCTION FEED - OPERATIONAL TEST** **Repeat Interval (Not to Exceed)**  **Compliance Time Action**  **Condition**

- Before Further Flight Isolate the cause of the leak, repair, and repeat the Engine Fuel Suction Feed - Operational Testin accordance with Accomplishment Instructions, paragraph 3.B., Work Instructions, Work Package 4. If the Engine No. 4 Fuel Suction Feed Operation Test fails

**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 WORK PACKAGE 1 - ENGINE NO - 1 - FUEL SUCTION FEED - OPERATIONAL TEST**  **Elapsed Hours Task Hours**  **Number of Persons Task**  1.00 3.00 3 Test Repair (a) 1.00 3.00 TOTAL FOR ENGINE NO.1 (a) (a) Totals given assume no repairs necessary.
**WORK PACKAGE 2 - ENGINE NO. 2 - FUEL SUCTION FEED - OPERATIONAL TEST Elapsed Hours**  **Task Hours Number of Persons**  **Task** 1.00 3.00 3 Test Repair (a) 1.00 3.00 TOTAL FOR ENGINE NO.2 (a) (a) Totals given assume no repairs necessary.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 18 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT WORK PACKAGE 3 - ENGINE NO. 3 - FUEL SUCTION FEED - OPERATIONAL TEST**  **Elapsed Hours Task Hours**  **Number of Persons Task**  1.00 3.00 3 Test Repair (a) 1.00 3.00 TOTAL FOR ENGINE NO.3 (a) (a) Totals given assume no repairs necessary.
**WORK PACKAGE 4 - ENGINE NO. 4 - FUEL SUCTION FEED - OPERATIONAL TEST Elapsed Hours**  **Task Hours Number of Persons**  **Task** 1.00 3.00 3 Test Repair (a) 1.00 3.00 TOTAL FOR ENGINE NO.4 (a) (a) Totals given assume no repairs necessary. **H. Weight and Balance Changes** None. **I. Electrical Load Data** Not changed. **J. References** 1. Existing Data: a. Federal Aviation Administration (FAA) Notice of Proposed Rule Making (NPRM) NPRM 2007-NM-356-AD b. Service Bulletin Index D6-30300 c. Aircraft Maintenance Manual (AMM) 747-100/200/300 AMM 28-22-00, 28-26-00, 49-11-00, 71-00-00. 2. Data Supplied with this Service Bulletin: None. 3. Installation Drawings Used in the Preparation of this Service Bulletin: None. **K. Publications Affected** 1. Publications:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 19 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT Chapter-Section**  **Publication** 28-22 747 Aircraft Maintenance Manual 2. Damage Tolerance Based Structural Inspections: Boeing has evaluated the repairs and/or changes in this service bulletin for effects on Fatigue Critical Structure (FCS) and for changes to Damage Tolerance Inspections (DTI) required in the Maintenance Program. This service bulletin does not affect FCS, therefore DTIs are not necessary. **L. Interchangeability and Intermixability of Parts** Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts. **M. Software Accomplishment Summary** Not affected.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 20 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT 2. MATERIAL INFORMATION**  **A. Material - Price and Availability** None. **B. Industry Support Information** Boeing warranty remedies are not available for the test an/or repair configuration changes given in this service bulletin. **C. Parts Necessary for Each Airplane** 1. Kits/Parts None. 2. Parts and Materials Supplied by the Operator None. 3. Parts Modified and Reidentified None. 4. Parts Removed and Not Replaced None. **D. Parts Necessary to Change Spares** None. **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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 21 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 22 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**

BLANK PAGE**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. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for definition of the acronyms 2. Obey all of the warnings and cautions given in the specified manual sections 3. The work instructions are divided into work packages. Task Hours and Elapsed Hours for each package are given in Paragraph 1.G., Manpower. You can do each work package independently 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 5. The instructions in Paragraph 3.B., Work Instructions and the figures can include operation of tools or test equipment. Boeing Engineering Tool Drawings, the Illustrated Tool and Equipment Manual, and the Special Tool and Ground Handling Drawing Index contain data on versions of the tools or test equipment that you can use. It is permitted to use replaced tools. It is not permitted to use superseded tools 6. If it is necessary to remove more parts for access, you can remove those parts. If you can get access without removing identified parts, it is not necessary to remove all of the identified parts. Jacking and shoring limitations must be observed 7. Where the work instructions include installation of a kept part, a new or serviceable part with the same part number can be installed as an alternative to the kept part. **B. WORK INSTRUCTIONS** Prepare for tests. 1. Do the "Engine Ground Safety Precautions". Refer to 747-100/200/300 AMM 71-00-00 2. Do the "Power Plant Operation (Normal)". Refer to 747-100/200/300 AMM 71-00-00. **NOTE:** The fuel quantity values given in the following work packages are at or below the fuel level necessary to cover the hydraulic heat exchangers. The hydraulic system pumps must be set to off when you operate the engines for the fuel suction feed - operational tests. The No. 4 engine auxiliary hydraulic pump must remain on to supply pressure for the parking brake.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 23 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT WORK PACKAGE 1 - ENGINE NO. 1 - FUEL SUCTION FEED - OPERATIONAL TEST**  **WARNING:** DO NOT OPERATE A FUEL PUMP IF THE LOW PRESSURE LIGHT COMES ON AND STAYS ON. FUEL VAPORS IN THE FUEL TANK MAY IGNITE AND CAUSE A FIRE OR AN EXPLOSION. **WARNING:** OBSERVE PROPER SAFETY PRECAUTIONS AROUND RUNNING ENGINE. WEAR EAR PROTECTORS AND STAY CLEAR OF ENGINE HAZARD AREAS. SEE "ENGINE GROUND SAFETY PRECAUTIONS" FOR ENGINE HAZARD DESCRIPTION. 1. Make sure that these quantities of fuel are in the fuel tanks
**FUEL QUANTITY TANK**  38,200 +/- 200 Lbs (17,300 +/- 200 Kgs) Center Tank 2,200 +/- 200 Lbs (1000 +/- 100 Kgs) Main Tank No. 1 1,600 +/- 200 Lbs (700 +/- 100 Kgs) Main Tank No. 2 No Restriction Reserve Tank No. 1 and No. 4 No Restriction Auxiliary Tank (if installed)
**NOTE:** Excess fuel can be transferred to Main Tank 3 and 4. Refer to "Tank-to-Tank Fuel Transfer" 747-100/200/300 AMM 28-26-00. 2. Make sure the No. 1 and No. 4 engine fuel crossfeed valves are open 3. Make sure the No. 2 and No. 3 engine fuel crossfeed valves are closed 4. Make sure all Fuel boost pump switches are OFF 5. Turn on No. 1 Main Tank FWD and AFT boost pumps 6. Start and operate the engine at idle power for a minimum of two minutes. Refer to 747-100/200/300 AMM 71-00-00 7. Make sure the APU is shut down by the master control switch. Refer to 747-100/200/300 AMM 49-11-00 8. After the two minute minimum warm-up period, monitor and record engine parameters: a. For Pratt and Whitney or GE engines record: N1, N2 and Fuel Flow b. For Rolls Royce engines record: N1, N2, N3 and Fuel Flow 9. Turn OFF the No. 1 Main Tank FWD and AFT boost pumps to begin the suction feed test 10. Make sure the engine continues to operate for a minimum of 5 minutes and engine parameters: a. For Pratt and Whitney or GE engines N1, N2 and Fuel Flow do not decrease b. For Rolls Royce engines N1, N2, N3 and Fuel Flow do not decrease

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 24 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**c. If engine does not operate for the full 5 minutes or there is a decrease in engine parameters N1, N2, N3 (Rolls Royce engines only) or a decrease in Fuel Flow, then do the following: (1) Turn on the No. 1 Main Tank FWD and AFT boost pumps (2) Shut down the engine. Refer to 747-100/200/300 AMM 71-00-00 (3) Isolate the cause of the leak, refer to "Engine Fuel Feed Lines / Couplings Vacuum Test" 747-100/200/300 AMM 28-22-00 and repair (4) After repair repeat this suction feed test. d. If the engine operates for the full 5 minutes with no decrease in engine parameters N1, N2, N3 (Rolls Royce engines only) or decrease in Fuel Flow, then do the following: (1) Turn on the No. 1 Main Tank FWD and AFT boost pumps (2) Shut down the engine. Refer to 747-100/200/300 AMM 71-00-00 11. Do all of the remaining Work Packages 12. If this is the last Work Package, put the airplane back to a serviceable condition.

**WORK PACKAGE 2 - ENGINE NO. 2 - FUEL SUCTION FEED - OPERATIONAL TEST WARNING:**  DO NOT OPERATE A FUEL PUMP IF THE LOW PRESSURE LIGHT COMES ON AND STAYS ON. FUEL VAPORS IN THE FUEL TANK MAY IGNITE AND CAUSE A FIRE OR AN EXPLOSION. **WARNING:** OBSERVE PROPER SAFETY PRECAUTIONS AROUND RUNNING ENGINE. WEAR EAR PROTECTORS AND STAY CLEAR OF ENGINE HAZARD AREAS. SEE "ENGINE GROUND SAFETY PRECAUTIONS" FOR ENGINE HAZARD DESCRIPTION. 1. Make sure that these quantities of fuel are in the fuel tanks
**FUEL QUANTITY TANK**  38,200 +/- 200 Lbs (17,300 +/- 200 Kgs) Center Tank 2,200 +/- 200 Lbs (1000 +/- 100 Kgs) Main Tank No. 1 1,600 +/- 200 Lbs (700 +/- 100 Kgs) Main Tank No. 2 No Restriction Reserve Tank No. 1 and No. 4 No Restriction Auxiliary Tank (If Installed)
**NOTE:** Excess fuel can be transferred to Main Tank 3 and 4. Refer to "Tank-to-Tank Fuel Transfer" 747-100/200/300 AMM 28-26-00. 2. Make sure the No. 2 and No. 3 engine fuel crossfeed valves are open 3. Make sure the No. 1 and No. 4 engine fuel crossfeed valves are closed

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 25 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**4. Make sure all Fuel boost pump switches are OFF 5. Turn on No. 2 Main Tank FWD and AFT boost pump 6. Start and operate the engine at idle power for a minimum of two minutes. Refer to 747-100/200/300 AMM 71-00-00 7. Make sure the APU is shut down by the master control switch. Refer to 747-100/200/300 AMM 49-11-00 8. After the two minute minimum warm-up period, monitor and record engine parameters: a. For Pratt and Whitney or GE engines record: N1, N2 and Fuel Flow b. For Rolls Royce engines record: N1, N2, N3 and Fuel Flow 9. Turn OFF the No. 2 Main Tank FWD and AFT boost pumps to begin the suction feed test 10. Make sure the engine continues to operate for a minimum of 5 minutes and engine parameters: a. For Pratt and Whitney or GE engines N1, N2 and Fuel Flow do not decrease b. For Rolls Royce engines N1, N2, N3 and Fuel Flow do not decrease c. If engine does not operate for the full 5 minutes or there is a decrease in engine parameters N1, N2, N3 (Rolls Royce engines only) or a decrease in Fuel Flow, then do the following: (1) Turn on the No. 2 Main Tank FWD and AFT boost pumps (2) Shut down the engine. Refer to 747-100/200/300 AMM 71-00-00 (3) Isolate the cause of the leak, refer to "Engine Fuel Feed Lines / Couplings Vacuum Test" 747-100/200/300 AMM 28-22-00 and repair (4) After repair repeat this suction feed test. d. If the engine operates for the full 5 minutes with no decrease in engine parameters N1, N2, N3 (Rolls Royce engines only) or decrease in Fuel Flow, then do the following: (1) Turn on the No. 2 Main Tank FWD and AFT boost pumps (2) Shut down the engine. Refer to 747-100/200/300 AMM 71-00-00. 11. Do all of the remaining Work Packages 12. If this is the last Work Package, put the airplane back to a serviceable condition.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 26 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT WORK PACKAGE 3 - ENGINE NO. 3 - FUEL SUCTION FEED - OPERATIONAL TEST**  **WARNING:** DO NOT OPERATE A FUEL PUMP IF THE LOW PRESSURE LIGHT COMES ON AND STAYS ON. FUEL VAPORS IN THE FUEL TANK MAY IGNITE AND CAUSE A FIRE OR AN EXPLOSION. **WARNING:** OBSERVE PROPER SAFETY PRECAUTIONS AROUND RUNNING ENGINE. WEAR EAR PROTECTORS AND STAY CLEAR OF ENGINE HAZARD AREAS. SEE "ENGINE GROUND SAFETY PRECAUTIONS" FOR ENGINE HAZARD DESCRIPTION. 1. Make sure that these quantities of fuel are in the fuel tanks
**FUEL QUANTITY TANK**  38,200 +/- 200 Lbs (17,300 +/- 200 Kgs) Center Tank 2,200 +/- 200 Lbs (1000 +/- 100 Kgs) Main Tank No. 4 1,600 +/- 200 Lbs (700 +/- 100 Kgs) Main Tank No. 3 No Restriction Reserve Tank No. 1 and No. 4 No Restriction Auxiliary Tank (if installed)
**NOTE:** Excess fuel can be transferred to Main Tank 1 and 2. Refer to Tank-to-Tank Fuel Transfer" 747-100/200/300 AMM 28-26-00. 2. Make sure the No. 2 and No. 3 engine fuel crossfeed valves are open 3. Make sure the No. 1 and No. 4 engine fuel crossfeed valves are closed 4. Make sure all Fuel boost pump switches are OFF 5. Turn on No. 3 Main Tank FWD and AFT boost pump 6. Start and operate the engine at idle power for a minimum of two minutes. Refer to 747-100/200/300 AMM 71-00-00 7. Make sure the APU is shut down by the master control switch. Refer to AMM 747-100/200/300 AMM 49-11-00 8. After the two minute minimum warm-up period, monitor and record engine parameters: a. For Pratt and Whitney or GE engines record: N1, N2 and Fuel Flow b. For Rolls Royce engines record: N1, N2, N3 and Fuel Flow 9. Turn OFF the No. 3 Main Tank FWD and AFT boost pumps to begin the suction feed test 10. Make sure the engine continues to operate for a minimum of 5 minutes and engine parameters: a. For Pratt and Whitney or GE engines N1, N2 and Fuel Flow do not decrease b. For Rolls Royce engines N1, N2, N3 and Fuel Flow do not decrease.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 27 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**c. If engine does not operate for the full 5 minutes or there is a decrease in engine parameters N1, N2, N3 (Rolls Royce engines only) or a decrease in Fuel Flow, then do the following: (1) Turn on the No. 3 Main Tank FWD and AFT boost pumps (2) Shut down the engine. Refer to 747-100/200/300 AMM 71-00-00 (3) Isolate the cause of the leak, refer to "Engine Fuel Feed Lines / Couplings Vacuum Test" 747-100/200/300 AMM 28-22-00 and repair (4) After repair repeat this suction feed test. d. If the engine operates for the full 5 minutes with no decrease in engine parameters N1, N2, N3 (Rolls Royce engines only) or decrease in Fuel Flow, then do the following: (1) Turn on the No. 3 Main Tank FWD and AFT boost pumps (2) Shut down the engine. Refer to 747-100/200/300 AMM 71-00-00 11. Do all of the remaining Work Packages 12. If this is the last Work Package, put the airplane back to a serviceable condition.

**WORK PACKAGE 4 - ENGINE NO. 4 - FUEL SUCTION FEED - OPERATIONAL TEST WARNING:**  DO NOT OPERATE A FUEL PUMP IF THE LOW PRESSURE LIGHT COMES ON AND STAYS ON. FUEL VAPORS IN THE FUEL TANK MAY IGNITE AND CAUSE A FIRE OR AN EXPLOSION. **WARNING:** OBSERVE PROPER SAFETY PRECAUTIONS AROUND RUNNING ENGINE. WEAR EAR PROTECTORS AND STAY CLEAR OF ENGINE HAZARD AREAS. SEE "ENGINE GROUND SAFETY PRECAUTIONS" FOR ENGINE HAZARD DESCRIPTION. 1. Make sure that these quantities of fuel are in the fuel tanks
**FUEL QUANTITY TANK**  38,200 +/- 200 Lbs (17,300 +/- 200 Kgs) Center Tank 2,200 +/- 200 Lbs (1000 +/- 100 Kgs) Main Tank No. 4 1,600 +/- 200 Lbs (700 +/- 100 Kgs) Main Tank No. 3 No Restriction Reserve Tank No. 1 and No. 4 No Restriction Auxiliary Tank (if installed)
**NOTE:** Excess fuel can be transferred to Main Tank 1 and 2. Refer to "Tank-to-Tank Fuel Transfer" 747-100/200/300 AMM 28-26-00. 2. Make sure the No. 1 and No. 4 engine fuel crossfeed valves are open 3. Make sure the No. 2 and No. 3 engine fuel crossfeed valves are closed

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 28 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**4. Make sure all Fuel boost pump switches are OFF 5. Turn on No. 4 Main Tank FWD and AFT boost pump 6. Start and operate the engine at idle power for a minimum of two minutes. Refer to 747-100/200/300 AMM 71-00-00 7. Make sure the APU is shut down by the master control switch. Refer to 747-100/200/300 AMM 49-11-00 8. After the two minute minimum warm-up period, monitor and record engine parameters: a. For Pratt and Whitney or GE engines record: N1, N2 and Fuel Flow b. For Rolls Royce engines record: N1, N2, N3 and Fuel Flow 9. Turn OFF the No. 4 Main Tank FWD and AFT boost pumps to begin the suction feed test 10. Make sure the engine continues to operate for a minimum of 5 minutes and engine parameters: a. For Pratt and Whitney or GE engines N1, N2 and Fuel Flow do not decrease b. For Rolls Royce engines N1, N2, N3 and Fuel Flow do not decrease c. If engine does not operate for the full 5 minutes or there is a decrease in engine parameters N1, N2, N3 (Rolls Royce engines only) or a decrease in Fuel Flow, then do the following: (1) Turn on the No. 4 Main Tank FWD and AFT boost pumps (2) Shut down the engine. Refer to 747-100/200/300 AMM 71-00-00 (3) Isolate the cause of the leak, refer to "Engine Fuel Feed Lines / Couplings Vacuum Test" 747-100/200/300 AMM 28-22-00 and repair (4) After repair repeat this suction feed test. d. If the engine operates for the full 5 minutes with no decrease in engine parameters N1, N2, N3 (Rolls Royce engines only) or decrease in Fuel Flow, then do the following: (1) Turn on the No. 4 Main Tank FWD and AFT boost pumps (2) Shut down the engine. Refer to 747-100/200/300 AMM 71-00-00 11. Do all of the remaining Work Packages 12. If this is the last Work Package, put the airplane back to a serviceable condition.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 02, 2012 747-28A2331 29 of 29 **BOEING SERVICE BULLETIN 747-28A2331 ALERT**  **ALERT**