# Boeing Alert Service Bulletin 747-28A2330: Revision 1

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- Document: [Boeing Alert Service Bulletin 747-28A2330](https://openairdocs.org/service-documents/boeing/747-28a2330.md)
- Title as filed: U.S. DOT/FAA - SB-747-28A2330-00--[1]
- Pages: 28
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### Page 1

Commercial 
Airplanes
747
Service Bulletin
ALERT
Number: 747-28A2330
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.
9E991ECCN:
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Unpublished Work.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, Dreamliner™,
BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and 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.
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Table of Contents
Summary ...................................................... 5
1. PLANNING INFORMATION ........................................ 9
A. Effectivity ................................................ 9
1. Airplanes ............................................. 9
2. Spares Affected ........................................ 1 3
B. Concurrent Requirements ...................................... 1 3
C. Reason ................................................ 1 3
D. Description .............................................. 1 3
E. Compliance .............................................. 1 4
F. Approval ............................................... 1 6
G. Manpower .............................................. 1 6
H. Weight and Balance Changes .................................... 1 7
I. Electrical Load Data ......................................... 1 7
J. References .............................................. 1 7
1. Existing Data: ......................................... 1 7
2. Data Supplied with this Service Bulletin: ........................... 1 8
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 8
K. Publications Affected ........................................ 1 8
L. Interchangeability and Intermixability of Parts ........................... 1 8
M. Software Accomplishment Summary ................................ 1 8
2. MATERIAL INFORMATION ........................................ 1 9
A. Material - Price and Availability ................................... 1 9
B. Industry Support Information .................................... 1 9
C. Parts Necessary for Each Airplane ................................. 1 9
1. Kits/Parts ............................................ 1 9
2. Parts and Materials Supplied by the Operator ........................ 1 9
3. Parts Modified and Reidentified ................................ 1 9
4. Parts Removed and Not Replaced .............................. 1 9
D. Parts Necessary to Change Spares ................................. 1 9
E. Special Tooling - Price and Availability ............................... 1 9
F. Special Tooling Necessary to do this Service Bulletin ....................... 1 9
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 1
A. GENERAL INFORMATION ..................................... 2 1
B. WORK INSTRUCTIONS ....................................... 2 1
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Commercial 
Airplanes
747
Service Bulletin
ALERT
SummaryNumber: 747-28A2330Original 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.
ReferenceAffectedPlanning Data
Paragraph 1.E., ComplianceYesAD Related
ACTION
The WORK PACKAGES can be done in any order.
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Each 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
Before Further Flight.
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
Before Further Flight.
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
Before Further Flight.
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
Before Further Flight.
EFFECTIVITY
747-400, 747-400D, 747-400F 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-357-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 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.
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MATERIAL INFORMATION
None.
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Commercial 
Airplanes
747
Service Bulletin
ALERT
Number: 747-28A2330
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.
DESCRIPTIONCONFIGURATIONGROUP
747-400, 747-400D, 747-400F airplanes-1
Airplane Models:
747-400, 747-400D, 747-400F
GroupVariable Number
1RF001 - RF006
1RL401 - RL403
1RL411 - RL436
1RL451 - RL456
1RL461 - RL462
1RL471 - RL481
1RL491 - RL492
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GroupVariable Number
1RL501 - RL502
1RL511 - RL516
1RL521 - RL522
1RL531 - RL534
1RL551
1RL561 - RL568
1RL571 - RL572
1RL576 - RL577
1RL579
1RL581 - RL586
1RL651 - RL655
1RL671 - RL675
1RL681 - RL684
1RL751 - RL752
1RM001 - RM007
1RM010 - RM013
1RM021 - RM024
1RM026 - RM030
1RM036 - RM045
1RM051 - RM053
1RM071
1RM081 - RM084
1RM091
1RM096 - RM097
1RM116 - RM117
1RM126 - RM132
1RM136 - RM147
1RM156 - RM158
1RM166 - RM177
1RM191 - RM192
1RM231 - RM233
1RM241 - RM246
1RM261 - RM264
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GroupVariable Number
1RM316 - RM318
1RM331 - RM333
1RM341
1RM351 - RM355
1RM366 - RM367
1RM401 - RM403
1RM426
1RM431
1RM441 - RM443
1RM445
1RM801 - RM803
1RM811 - RM813
1RM851 - RM859
1RM861 - RM863
1RM871 - RM899
1RM901 - RM906
1RM911
1RR701
1RR721 - RR724
1RR746 - RR748
1RR851 - RR856
1RR861 - RR862
1RR951 - RR952
1RT001 - RT014
1RT021 - RT022
1RT031 - RT035
1RT041 - RT047
1RT061
1RT071 - RT075
1RT101 - RT103
1RT121
1RT131 - RT137
1RT151 - RT152
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GroupVariable Number
1RT161 - RT168
1RT401 - RT412
1RT431 - RT447
1RT451 - RT469
1RT471 - RT499
1RT501 - RT535
1RT551 - RT568
1RT571 - RT591
1RT601 - RT657
1RT671 - RT673
1RT681 - RT682
1RT691 - RT699
1RT701 - RT704
1RT711 - RT717
1RT741 - RT757
1RT776 - RT777
1RT781 - RT784
1RT801 - RT803
1RT811 - RT814
1RT831 - RT837
1RT861 - RT864
1RT876 - RT880
1RT931 - RT932
1RT945 - RT949
1RT951 - RT955
1RT966 - RT967
1RU001 - RU006
1RU016 - RU017
1RU031 - RU032
1RU051 - RU052
1RU059 - RU062
1RU081 - RU083
1RU101 - RU102
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GroupVariable Number
1RU121 - RU132
1RU801 - RU809
1RU831 - RU841
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.
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 Before Further Flight.
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 Before Further Flight.
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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 Before Further Flight.
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 Before Further Flight.
The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones
ZoneModel
221, 222747-400, 747-400D, 747-400F
E. Compliance
Federal Aviation Administration (FAA) Notice of Proposed Rule Making NPRM 2007-NM-357-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 TimeActionCondition
30,000 flight hoursWithin 30,000 flight
hours after the
original issue date
of this service bul-
letin.
Do the Engine No. 1 Fuel
Suction Feed - Opera-
tional Test in accordance
with Accomplishment In-
structions, paragraph
3.B., Work Instructions,
Work Package 1.
All airplanes
-Before Further
Flight
Isolate the cause of the
leak, repair, and repeat
the Engine No 1 Fuel
Suction Feed - Opera-
tional Test in accordance
with Accomplishment In-
structions, paragraph
3.B., Work Instructions,
Work Package 1.
If the Engine No. 1 Fuel
Suction Feed - Operational
Test fails
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Table 2: ENGINE NO. 2 - FUEL SUCTION FEED - OPERATIONAL TEST
Repeat Interval
(Not to Exceed)
Compliance TimeActionCondition
30,000 flight hoursWithin 30,000 flight
hours after the
original issue date
of this service bul-
letin.
Do the Engine No. 2 Fuel
Suction Feed - Opera-
tional Test in accordance
with Accomplishment In-
structions, paragraph
3.B., Work Instructions,
Work Package 2.
All airplanes
-Before Further
Flight
Isolate the cause of the
leak, repair, and repeat
the Engine No. 2 Fuel
Suction Feed - Opera-
tional Test in accordance
with Accomplishment In-
structions, paragraph
3.B., Work Instructions,
Work Package 2.
If the Engine No. 2 Fuel
Suction Feed - Operational
Test fails
Table 3: ENGINE NO. 3 - FUEL SUCTION FEED - OPERATIONAL TEST
Repeat Interval
(Not to Exceed)
Compliance TimeActionCondition
30,000 flight hoursWithin 30,000 flight
hours after the
original issue date
of this service bul-
letin.
Do the Engine No. 3 Fuel
Suction Feed - Opera-
tional Test in accordance
with Accomplishment In-
structions, paragraph
3.B., Work Instructions,
Work Package 3.
All airplanes
-Before Further
Flight
Isolate the cause of the
leak, repair, and repeat
the Engine No. 3 Fuel
Suction Feed - Opera-
tional Test in accordance
with Accomplishment In-
structions, paragraph
3.B., Work Instructions,
Work Package 3.
If the Engine No. 3 Fuel
Suction Feed - Operational
Test fails
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Table 4: ENGINE NO. 4 - FUEL SUCTION FEED - OPERATIONAL TEST
Repeat Interval
(Not to Exceed)
Compliance TimeActionCondition
30,000 flight hoursWithin 30,000 flight
hours after the
original issue date
of this service bul-
letin.
Do the Engine No. 4 Fuel
Suction Feed - Opera-
tional Test in accordance
with Accomplishment In-
structions, paragraph
3.B., Work Instructions,
Work Package 4.
All airplanes
-Before Further
Flight
Isolate the cause of the
leak, repair, and repeat
the Engine No. 4 Fuel
Suction Feed - Opera-
tional Test in accordance
with Accomplishment In-
structions, paragraph
3.B., Work Instructions,
Work Package 4.
If the Engine No. 4 Fuel
Suction Feed - Operational
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 HoursTask HoursNumber of PersonsTask
1.003.003Test
Repair (a)
1.003.00TOTAL FOR ENGINE NO.1 (a)
(a) Totals given assume no repairs necessary.
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WORK PACKAGE 2 - ENGINE NO. 2 - FUEL SUCTION FEED - OPERATIONAL TEST
Elapsed HoursTask HoursNumber of PersonsTask
1.003.003Test
Repair (a)
1.003.00TOTAL FOR ENGINE NO.2 (a)
(a) Totals given assume no repairs necessary
WORK PACKAGE 3 - ENGINE NO. 3 - FUEL SUCTION FEED - OPERATIONAL TEST
Elapsed HoursTask HoursNumber of PersonsTask
1.003.003Test
Repair (a)
1.003.00TOTAL FOR ENGINE NO.3 (a)
(a) Totals given assume no repairs necessary.
WORK PACKAGE 4 - ENGINE NO. 4 - FUEL SUCTION FEED - OPERATIONAL TEST
Elapsed HoursTask HoursNumber of PersonsTask
1.003.003Test
Repair (a)
1.003.00TOTAL 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-357-AD
b. Service Bulletin Index D6-30300
c. 747-400 Aircraft Maintenance Manual 747-400 AMM 28-22-00, 28-22-07, 28-26-00, 49-11-00,
71-00-00.
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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:
Chapter-SectionPublication
28-22747 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
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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.
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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. 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 747-400 AMM 71-00-00
2. Do the "Prepare for the Power Plant Operation". Refer to 747-400 AMM 71-00-00
3. Make sure that the hydraulic pump switches are as shown below:
a. HYD PUMPS ENGINE 1 - OFF
b. HYD PUMPS ENGINE 2 - OFF
c. HYD PUMPS ENGINE 3 - OFF
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### Page 22

d. HYD PUMPS ENGINE 4 - OFF
e. HYD PUMPS DEMAND 1 - OFF
f. HYD PUMPS DEMAND 2 - OFF
g. HYD PUMPS DEMAND 3 - OFF
h. HYD PUMPS DEMAND 4 - AUX.
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 as given above 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.
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. THIS CONDITION CAN CAUSE THE IGNITION OF THE FUEL FUMES IN
THE FUEL TANK. A FIRE OR AN EXPLOSION CAN CAUSE INJURIES TO PERSONNEL
AND DAMAGE TO EQUIPMENT.
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 QUANTITYTANK
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 RestrictionReserve Tank No. 1 and No. 4
No RestrictionAuxiliary Tank (if installed)
NOTE: Excess fuel can be transferred to Main Tank 3 and 4. Refer to "Tank to Tank Fuel Transfer"
747-400 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 747-400 AMM
71-00-00
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### Page 23

7. Make sure the APU is shut down. Refer to 747-400 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
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 No. 1 Main Tank FWD and AFT boost pumps
(2) Shut down the engine. Refer to 747-400 AMM 71-00-00
(3) Isolate the cause of the leak, refer to "Engine Fuel-Feed Manifold Air Pressure Leak
Check" 747-400 AMM 28-22-07 or "Boost Pump Bypass Fuel-Feed Line Vacuum Test"
747-400 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 No. 1 Main Tank FWD and AFT boost pumps
(2) Shut down the engine. Refer to 747-400 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. THIS CONDITION CAN CAUSE THE IGNITION OF THE FUEL FUMES IN
THE FUEL TANK. A FIRE OR AN EXPLOSION CAN CAUSE INJURIES TO PERSONNEL
AND DAMAGE TO EQUIPMENT
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
Export Controlled ECCN: 9E991 - BOEING
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### Page 24

FUEL QUANTITYTANK
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 RestrictionReserve Tank No. 1 and No. 4
No RestrictionAuxiliary Tank (If Installed)
NOTE: Excess fuel can be transferred to Main Tank 3 and 4. Refer to 747-400 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. 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 747-400 AMM
71-00-00
7. Make sure the APU is shut down. Refer to 747-400 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 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 No. 2 Main Tank FWD and AFT boost pumps
(2) Shut down the engine. Refer to 747-400 AMM 71-00-00
(3) Isolate the cause of the leak, refer to "Engine Fuel-Feed Manifold Air Pressure Leak
Check" 747-400 AMM 28-22-07 or "Boost Pump Bypass Fuel-Feed Line Vacuum Test"
747-400 AMM 28-22-00 and repair
(4) After repair repeat this suction feed test
Export Controlled ECCN: 9E991 - BOEING
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### Page 25

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 No. 2 Main Tank FWD and AFT boost pumps
(2) Shut down the engine. Refer to 747-400 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 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. THIS CONDITION CAN CAUSE THE IGNITION OF THE FUEL FUMES IN
THE FUEL TANK. A FIRE OR AN EXPLOSION CAN CAUSE INJURIES TO PERSONNEL
AND DAMAGE TO EQUIPMENT
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 QUANTITYTANK
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 RestrictionReserve Tank No. 1 and No. 4
No RestrictionAuxiliary Tank (if installed)
NOTE: Excess fuel can be transferred to Main Tank 1 and 2. Refer to 747-400 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 747-400 AMM
71-00-00
7. Make sure the APU is shut down. Refer to AMM 747-400 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
Export Controlled ECCN: 9E991 - BOEING
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### Page 26

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 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 No. 3 Main Tank FWD and AFT boost pumps
(2) Shut down the engine. Refer to 747-400 AMM 71-00-00
(3) Isolate the cause of the leak, refer to "Engine Fuel-Feed Manifold Air Pressure Leak
Check" 747-400 AMM 28-22-07 or "Boost Pump Bypass Fuel-Feed Line Vacuum Test"
747-400 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 No. 3 Main Tank FWD and AFT boost pumps
(2) Shut down the engine. Refer to 747-400 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. THIS CONDITION CAN CAUSE THE IGNITION OF THE FUEL FUMES IN
THE FUEL TANK. A FIRE OR AN EXPLOSION CAN CAUSE INJURIES TO PERSONNEL
AND DAMAGE TO EQUIPMENT
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 QUANTITYTANK
38,200 +/- 200 Lbs (17,300 +/- 200 Kgs)Center Tank
2,200 +/- 200 Lbs (1000 +/- 100 Kgs)Main Tank No. 4
Export Controlled ECCN: 9E991 - BOEING
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### Page 27

FUEL QUANTITYTANK
1,600 +/- 200 Lbs (700 +/- 100 Kgs)Main Tank No. 3
No RestrictionReserve Tank No. 1 and No. 4
No RestrictionAuxiliary Tank (if installed)
NOTE: Excess fuel can be transferred to Main Tank 1 and 2. Refer to 747-400 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. 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 747-400 AMM
71-00-00
7. Make sure the APU is shut down. Refer to 747-400 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 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 No. 4 Main Tank FWD and AFT boost pumps
(2) Shut down the engine. Refer to 747-400 AMM 71-00-00
(3) Isolate the cause of the leak, refer to "Engine Fuel-Feed Manifold Air Pressure Leak
Check" 747-400 AMM 28-22-07 or "Boost Pump Bypass Fuel-Feed Line Vacuum Test"
747-400 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:
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### Page 28

(1) Turn on No. 4 Main Tank FWD and AFT boost pumps
(2) Shut down the engine. Refer to 747-400 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
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ALERTALERT

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