# Boeing Alert Service Bulletin 747-28A2204: Revision 3

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- Document: [Boeing Alert Service Bulletin 747-28A2204](https://openairdocs.org/service-documents/boeing/747-28a2204.md)
- Title as filed: U.S. DOT/FAA - Service Bulletin -747-28A2204-03
- Pages: 28
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## Text

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### Page 1

Commercial 
Airplanes
747
Service Bulletin
ALERT
Number: 747-28A2204
Original Issue: December 19, 1996
Revision 3: March 11, 2010
ATA System: 2822
SUBJECT: FUEL - Distribution - Engine Fuel Feed System Outboard Main Tank Boost Pump
Wiring Inspection
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.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET
Copyright © 1996 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Unpublished Work - All Rights Reserved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, KC-10, KDC-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.
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747-28A2204Revision 3: March 11, 2010
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Table of Contents
Revision Transmittal Sheet ............................................ 5
Summary ...................................................... 7
1. PLANNING INFORMATION ........................................ 1 1
A. Effectivity ............................................... 1 1
1. Airplanes ............................................ 1 1
2. Spares Affected ........................................ 2 0
B. Concurrent Requirements ...................................... 2 0
C. Reason ................................................ 2 0
D. Description .............................................. 2 1
E. Compliance .............................................. 2 1
F. Approval ............................................... 2 1
G. Manpower .............................................. 2 2
H. Weight and Balance Changes .................................... 2 2
I. Electrical Load Data ......................................... 2 2
J. References .............................................. 2 2
1. Existing Data: ......................................... 2 2
2. Data supplied with this Service Bulletin: ........................... 2 3
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 2 3
K. Publications Affected ........................................ 2 3
L. Interchangeability and Intermixability of Parts ........................... 2 3
2. MATERIAL INFORMATION ........................................ 2 5
A. Material - Price and Availability ................................... 2 5
B. Industry Support Information .................................... 2 5
C. Parts Necessary For Each Airplane ................................. 2 5
1. Kits/Parts: ........................................... 2 5
2. Parts and Materials Supplied by the Operator: ........................ 2 5
3. Parts Modified and Reidentified: ............................... 2 5
4. Parts Removed and Not Replaced: .............................. 2 5
D. Parts Necessary to Change Spares ................................. 2 5
E. Special Tooling - Price and Availability ............................... 2 5
F. Special Tooling Necessary to do this Service Bulletin ....................... 2 5
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 7
A. GENERAL INFORMATION ..................................... 2 7
B. WORK INSTRUCTIONS ....................................... 2 7
FIGURE 1: BOOST PUMP REFERENCE LOCATOR ........................... 2 8
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747-28A2204Revision 3: March 11, 2010
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ALERTALERT
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Commercial 
Airplanes
747
Service Bulletin
ALERT
Revision Transmittal SheetNumber: 747-28A2204Original Issue: December 19, 1996
Revision 3: March 11, 2010
ATA System: 2822
SUBJECT: FUEL - Distribution - Engine Fuel Feed System Outboard Main Tank Boost Pump
Wiring Inspection
This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION
Federal Aviation Administration (FAA) Airworthiness Directive FAA AD 97-26-07, is related to this service bulletin.
No more work is necessary on airplanes inspected as shown in the revision 2 of this service bulletin.
747 airplanes line number 1317 - 1419 are added to effectivity.
REASON FOR REVISION
This revision is sent to tell operators that Compliance is revised. Operators have reported finding fuel pump wire
bundle chafing of Teflon sleeving, jacket and wire installation before 30,000 flight cycles, or 60,000 flight hours.
The wire bundle chafing could possibly wear away the sleeving, jacket and wire installation and expose metal
conductors, which could result in electrical arcing. Boeing recommends that the operators accomplish the wiring
inspection given in this service bulletin within 15,000 flight hours from the last inspection, or 6,000 flight hours
from the date of this revision, whichever occurs later, but not to exceed 60,000 flight hours from the last inspection.
The inspection will be required to be repeated every 15,000 flight hours from the previous inspection.
Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location
of important changes.
Airplanes are added to effectivity. Refer to Paragraph 1.A., Effectivity.
Pages with no vertical lines have no important changes.
REVISION HISTORY
December 19, 1996Original Issue:
October 30, 1997Revision 1:
September 01, 2005Revision 2:
March 11, 2010Revision 3:
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Commercial 
Airplanes
747
Service Bulletin
ALERT
SummaryNumber: 747-28A2204Original Issue: December 19, 1996
Revision 3: March 11, 2010
ATA System: 2822
SUBJECT: FUEL - Distribution - Engine Fuel Feed System Outboard Main Tank Boost Pump
Wiring Inspection
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
Boeing service bulletin 747-28A2092 or 747-28A2165, is necessary to be accomplished prior to or concurrent
with this service bulletin.
BACKGROUND
This inspection will make sure the number 1 and number 4 main fuel tank boost pump wiring is not chafed and
will not cause arcing inside the fuel tank.
The number 1 and number 4 main fuel tank boost pump wiring is installed with a double layer of Teflon sleeving
in the conduit. The sleeving is installed to prevent arcing between the boost pump power wiring and the conduit
caused by wire chafing.
747 airplanes cumulative line numbers 329, 348 and 356 and on had the two sleeves installed in production.
All other airplanes were the subject of Alert Service Bulletin 747-28A2092 or 747-28A2165 which inspected the
boost pump wiring for damage and installed the two sleeves.
747 airplanes cumulative line numbers 001-432 have aluminum conduits for the main tank boost pumps. All
other 747 airplanes have stainless steel conduits. If the boost pump power wiring shorts to the conduit, it is more
likely that the aluminum conduit can melt and make a hole. This could result in a fuel leak, fire or an explosion.
We have not been told that chafed wires have caused any conduits to be melted through since Service Bulletin
747-28A2092 was issued.
ACTION
Remove the number 1 and number 4 main tank forward and aft boost pump cover plates. Remove the boost
pump wire bundle from the conduit. Inspect the sleeving/wire bundle for damage. Install the boost pump cover
plates. Do a test of the boost pumps.
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EFFECTIVITY
All 747 Airplanes line number 0001-1419.
Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes.
COMPLIANCE
Refer to Paragraph 1.E., Compliance.
For all 747 series airplanes, certificated in any category, FAA AD 97-26-07, is related to this service bulletin and
supersedes FAA AD 96-26-06, Amendment 39-9870.
INDUSTRY SUPPORT INFORMATION
Boeing warranty remedies are not available for the inspection given in this service bulletin.
MANPOWER
Total Man-hours - 4.0 for each airplane Elapsed Time - 2.0 Hours
MATERIAL INFORMATION
Operator Supplied Parts
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BOEING SERVICE BULLETIN 747-28A2204
ALERT  ALERT
LEFT SIDE SHOWN
(RIGHT SIDE SIMILAR)
NO. 1 OR NO. 4
MAIN TANK
NO. 2 OR NO. 3
MAIN TANK
FWD
- INBD
DO AN INSPECTION
OF THE WIRE BUNDLE  R99006
IN THE CONDUIT.
Original Issue: December 19, 1996
Revision 3: March 11, 2010  747-28A2204
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.  9 of 28

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BOEING PROPRIETARY -
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ALERTALERT
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Commercial 
Airplanes
747
Service Bulletin
ALERT
Number: 747-28A2204
Original Issue: December 19, 1996
Revision 3: March 11, 2010
ATA System: 2822
SUBJECT: FUEL - Distribution - Engine Fuel Feed System Outboard Main Tank Boost Pump
Wiring Inspection
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
Refer to Service Bulletin Index Document D6-30300, Part 3 for Airplane Variable Number, Line
Number, and Serial Number data.
This service bulletin is for the airplanes shown below.
DESCRIPTIONCONFIGURATIONGROUP
All 747 Airplanes Line Numbers 0001-1419-1
Airplane Models:
747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400,
747-400D, 747-400F, 747SP, 747SR
GroupVariable Number
1RA001 - RA034
1RA101 - RA115
1RA161 - RA164
1RA201 - RA203
1RA216 - RA217
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GroupVariable Number
1RA245 - RA246
1RA251 - RA266
1RA301 - RA318
1RA351 - RA360
1RA369 - RA373
1RA401 - RA418
1RA501 - RA502
1RA521 - RA528
1RA532 - RA548
1RA551 - RA552
1RA559 - RA561
1RA581 - RA582
1RA585
1RA601 - RA602
1RA631 - RA635
1RA651 - RA652
1RA671 - RA677
1RA701 - RA702
1RA721 - RA731
1RA741 - RA745
1RA749 - RA750
1RA761 - RA762
1RA781 - RA784
1RA901 - RA916
1RB001 - RB016
1RB041 - RB044
1RB071 - RB075
1RB101 - RB102
1RB411 - RB413
1RB421
1RB601 - RB607
1RB681 - RB697
1RB711
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GroupVariable Number
1RB721 - RB723
1RB741 - RB748
1RD001 - RD004
1RD021 - RD022
1RD041 - RD059
1RD071 - RD072
1RD081 - RD083
1RD091 - RD092
1RD101 - RD104
1RD121 - RD127
1RD131 - RD144
1RD166 - RD167
1RD171 - RD172
1RD181 - RD183
1RD201 - RD204
1RD221 - RD227
1RD231 - RD235
1RD241 - RD243
1RD251 - RD262
1RD271 - RD272
1RD291 - RD292
1RD301 - RD302
1RD311
1RD351 - RD358
1RD361 - RD366
1RD381 - RD383
1RD411 - RD414
1RD421 - RD426
1RD431 - RD435
1RD441 - RD442
1RD451 - RD456
1RD461
1RD471 - RD475
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GroupVariable Number
1RD513 - RD519
1RD531 - RD533
1RD551
1RD561
1RD571
1RD581 - RD583
1RD591 - RD593
1RD601 - RD607
1RD621 - RD623
1RD641 - RD649
1RD651 - RD659
1RD661
1RD671
1RD681 - RD682
1RD691 - RD692
1RD701 - RD702
1RD721 - RD722
1RD741 - RD742
1RD751 - RD755
1RD761
1RD771 - RD775
1RD781 - RD783
1RD791 - RD792
1RE001
1RF001 - RF006
1RG001 - RG009
1RG091
1RG095
1RG101 - RG104
1RG121 - RG126
1RG141 - RG142
1RG161 - RG164
1RG171 - RG174
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GroupVariable Number
1RG191 - RG193
1RG211 - RG213
1RG221 - RG222
1RH101 - RH102
1RH111 - RH112
1RH121 - RH122
1RJ131 - RJ133
1RJ151 - RJ152
1RJ301 - RJ303
1RJ321 - RJ322
1RJ331 - RJ333
1RL401 - RL403
1RL411 - RL436
1RL451 - RL456
1RL461 - RL462
1RL471 - RL481
1RL491 - RL492
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
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GroupVariable Number
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
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
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GroupVariable Number
1RM911
1RR001 - RR005
1RR021 - RR025
1RR031
1RR201 - RR206
1RR221 - RR226
1RR261 - RR267
1RR301 - RR310
1RR331 - RR332
1RR336
1RR341 - RR345
1RR361 - RR362
1RR421 - RR422
1RR431 - RR432
1RR441 - RR442
1RR451
1RR501 - RR504
1RR521 - RR522
1RR526
1RR531
1RR551 - RR556
1RR561
1RR566
1RR701
1RR721 - RR724
1RR746 - RR748
1RR851 - RR856
1RR861 - RR862
1RR951 - RR952
1RS001 - RS002
1RS201
1RS211 - RS212
1RS221 - RS222
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GroupVariable Number
1RS231 - RS241
1RS251 - RS259
1RS263
1RS265 - RS268
1RS271 - RS276
1RS291 - RS292
1RS301 - RS306
1RS311 - RS320
1RS331 - RS333
1RS341 - RS342
1RS699
1RS701 - RS703
1RS711 - RS713
1RS721 - RS722
1RS731 - RS732
1RS741 - RS743
1RS751 - RS752
1RS761 - RS762
1RS771
1RS781 - RS782
1RS786
1RT001 - RT014
1RT021 - RT022
1RT031 - RT035
1RT041 - RT047
1RT061
1RT071 - RT075
1RT101 - RT103
1RT121
1RT131 - RT137
1RT151 - RT152
1RT161 - RT168
1RT401 - RT412
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GroupVariable Number
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
1RU121 - RU132
1RU801 - RU809
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GroupVariable Number
1RU831 - RU841
2. Spares Affected
None.
B. Concurrent Requirements
Boeing service bulletin 747-28A2092 or 747-28A2165, is necessary to be accomplished prior to or
concurrent with this service bulletin.
C. Reason
This inspection will make sure the number 1 and number 4 main fuel tank boost pump wiring is not
chafed and will not cause arcing inside the fuel tank.
The number 1 and number 4 main fuel tank boost pump wiring is installed with a double layer of teflon
sleeving in the conduit. The sleeving is installed to prevent arcing between the boost pump power
wiring and the conduit caused by wire chafing.
747 airplanes cumulative line numbers 329, 348 and 356 and on had the two sleeves installed in
production. All other airplanes were the subject of Alert Service Bulletin 747-28A2092 or 747-28A2165
which inspected the boost pump wiring for damage and installed the two sleeves.
747 airplanes cumulative line numbers 001-432 have aluminum conduits for the main tank boost pumps.
All other 747 airplanes have stainless steel conduits. If the boost pump power wiring shorts to the
conduit, it is more likely that the aluminum conduit can melt and make a hole. This could result in a
fuel leak, fire or an explosion.
We have not been told that chafed wires have caused any conduits to be melted through since Service
Bulletin 747-28A2092 or 747-28A2165 was issued.
Revision 1 is sent to add airplanes delivered after line number 432. A repeat inspection is added for
all 747 airplanes.
Revision 2 is sent to tell operators that airplanes line number 1121-1316 were added to the effectivity.
Also, steps have been added to the referenced airplane maintenance manual sections to amplify and
clarify the expected inspection procedures.
Revision 3 is sent to tell operators that Compliance is revised. Operators have reported finding fuel
pump wire bundle chafing before 30,000 flight cycles, or 60,000 flight hours. The wire bundle chafing
could possibly wear away the sleeving, jacket and wire installation and expose metal conductors, which
could result in electrical arcing. Boeing recommends that the operators accomplish the wiring inspection
given in this service bulletin within 15,000 flight hours from the last inspection, or 6,000 flight hours
from the date of this revision, whichever occurs later, but not to exceed 60,000 flight hours from the
last inspection. The inspection will be required to be repeated every 15,000 flight hours from the previous
inspection.
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D. Description
The number 1 and number 4 main tank forward and aft boost pump cover plates are removed. The
boost pump wire bundle is removed from the conduit. The sleeving/wire bundle is inspected for damage.
The boost pump cover plates are installed. A test of the boost pumps is done.
Revision 1 - No more work is necessary on airplanes changed as shown in the initial release of this
service bulletin.
This inspection assumes that service bulletin 747-28A2092 or 747-28A2165 has been incorporated.
Revision 2 - No more work is necessary on airplanes changed as shown in the initial release and the
Revision 1 of this service bulletin.
Revision 3 - No more work is necessary on airplanes inspected as shown in revision 2 of this service
bulletin.
PLEASE SEND A REPORT OF YOUR INSPECTION PROGRAM. ALSO, SEND THE INSPECTION
RESULTS WHEN EACH INSPECTION IS COMPLETE.
SEND TO:
BOEING COMMERCIAL AIRPLANE GROUP ATTENTION: MANAGER, AIRLINE SUPPORT
The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones
ZoneModel
544, 545, 644, 645747-100, 747-100B, 747-100B
SUD, 747-200B, 747-200C,
747-200F, 747-300, 747-400,
747-400D, 747-400F, 747SP,
747SR
E. Compliance
For all 747 series airplanes, certificated in any category, FAA AD 97-26-07, Amendment 39-10250, is
related to this service bulletin and supersedes FAA AD 96-26-06, Amendment 39-9870.
Boeing recommends that the operators accomplish the wiring inspection given in this service bulletin
within 15,000 flight hours from the last inspection, or 6,000 flight hours from the date of this revision,
whichever occurs later, but not to exceed 60,000 flight hours from the last inspection. The inspection
will be required to be repeated every 15,000 flight hours from the previous inspection.
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 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.
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### Page 22

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.
This service bulletin has been approved by the FAA. In addition, the Manager of the FAA Seattle Aircraft
Certification Office approves the inspection and the replacement, as required, of the wire bundle and
sleeves of the boost pumps of the numbers 1 and 4 main fuel tanks, and of the auxiliary tank jettison
pumps (if installed), as described in this service bulletin, as an alternative method of compliance with
the requirements of paragraphs (a), (b), (c), (d) and (e) of FAA AD 97-26-07. All provisions of FAA AD
97-26-07 that are not specifically referenced in the above statement remain fully applicable and must
be met.
G. Manpower
The table below shows an estimate of the task-hours necessary to do this inspection 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 examine the work
— Time to cure the materials
— Time to make the parts
— Time to find the tools.
Elapsed HoursTask-HoursNumber of Per-
sons
Task
242Inspect
24TOTAL FOR EACH AIRPLANE
H. Weight and Balance Changes
None.
I. Electrical Load Data
Not changed.
J. References
1. Existing Data:
a. Boeing Service Bulletin 747-28A2092, 747-28A2165
b. Federal Aviation Administration (FAA) Airworthiness Directive 96-26-06, 97-26-07
c. Standard Wiring Practices Manual (SWPM) 20-10-11, 20-10-12
d. 747-400 Aircraft Maintenance Manual (AMM) 28-22-03, 28-22-06
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BOEING SERVICE BULLETIN 747-28A2204
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### Page 23

2. Data supplied with this Service Bulletin:
None.
3. Installation Drawings Used in the Preparation of this Service Bulletin:
These drawings were used to prepare this service bulletin. These drawings are not necessary to
make the specified changes, and are not supplied with this service bulletin. These drawings may
not be applicable to all airplane configurations or operators.
TitleDrawing Number
Fuel Boost Pump Installation65B92401
Plumbing Instl. - Fuel Feed, Auxiliary Tanks 1A and 4A65B92482
K. Publications Affected
1. Publications:
None.
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.
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Copyright © Unpublished Work - See page 1 for details.
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ALERTALERT

### Page 24

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Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 19, 1996
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ALERTALERT
BLANK PAGE

### Page 25

2.    MATERIAL INFORMATION
A. Material - Price and Availability
None.
B. Industry Support Information
Boeing warranty remedies are not available for the inspection 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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Copyright © Unpublished Work - See page 1 for details.
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### Page 26

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Copyright © Unpublished Work - See page 1 for details.
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ALERTALERT
BLANK PAGE

### Page 27

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. Refer to the Boeing Standard Wiring Practices Manuals SWPM 20-10-11 and SWPM
20-10-12 for the wire installation procedures.
B. WORK INSTRUCTIONS
1. Do the inspection of the wire bundle inside the conduit.
a. On all except 747-400 airplanes, refer to 747-400 AMM 28-22-03, Main Tank Boost Pump
Wiring - Inspection/Check. On airplanes RD121 and RJ151 only, this inspection must be done
on the auxiliary jettison pump wire bundles, if the pumps are installed. Refer to the 747 AMM
for the access and test data for these pumps. The inspection procedure is the same as
mentioned above for the main tank boost pumps.
b. On 747-400 airplanes, refer to 747-400 AMM 28-22-06, Main Tank Boost Pump Wiring -
Inspection/Check.
2. Put the airplane back into serviceable condition.
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Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 19, 1996
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BOEING SERVICE BULLETIN 747-28A2204
ALERTALERT

### Page 28 (OCR)

BOEING SERVICE BULLETIN 747-28A2204
ALERT  ALERT
LEFT SIDE SHOWN
(RIGHT SIDE SIMILAR)
NO. 1 OR NO. 4
MAIN TANK
NO. 2 OR NO. 3
MAIN TANK
FWD
- INBD
DO AN INSPECTION
OF THE WIRE BUNDLE
IN THE CONDUIT.
FIGURE 1: BOOST PUMP REFERENCE LOCATOR
(SHEET 1 OF 1)
Original Issue: December 19, 1996
Revision 3 March 11, 2010  747-28A2204
BOEING PROPRIETARY -
Copyright © Unpublished Work - See page 1 for details.  28 of 28

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