Maintenance Service Bulletin 747 28A 2194 RA311 Ex 11K

User Manual: RA311

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DOCKET NO.
SA-516
EXHIBIT NO.
11K
NATIONAL TRANSPORTATION SAFETY BOARD
WASHINGTON, D. C.
SERVICE BULLETIN 747-28A-2194
(PAGES K-1 THRU
K-26)
LiTmmt5HQ Commercial
Airplane
747
, Group
Service Bulletin
Number: 747-28A2194
Date: August 3. %Zr9?5
Revision 1: January 18,1996
ATA System: 2822
Revision Transmittal Sheet
1 SUBJECT:
FUEL - DISTRIBUTION - FUEL BOOST AND CWERRIDUJE-lTISON PUMPS - INSPECTION 1
This revision includes all pages of the serv$e bullet)?.
COMPLIANCE INFORMATION RELATEPTO THIS REVISION
No more work is necessary on airplanes cbangeU as shown in the initial release of this service bulletin.
SUMMARY
This revision is sent to add a check of tne boost pump ground wire to the accomplishment instructions, add
an A-check inspection interval to the Compliance paragraph and add an optional off-wing inspection of the
fuel pumps. The accomplishment instructions format has been changed to agree with Service Bulletin
757-28A0043.
The data given in Notice of Status Change 747-28A2194 NSC 1 is included in this revision.
Paragraph LA., Effectivity, shows changes of airplane operators.
Effectivity paragraph for changes. Each operator should examine the
Vertical lines are put on the left edge of each page, except in Paragraph I.A., Effectivity, to show the location
of important changes.
Pages with a revision number and date, but no vertical lines, have no important changes.
REVISION HISTORY
Initial Release: August 3, 1995
Revision I : January 18,1996
BOEING COMMERCIAL AIRPLANE GROUP P.O. BOX 3707 SEAlTLE, WASHldGTON 98124-2207
K-l
D!a!szIHQ
Commercial
Airplane
747
1
- Group
Service Bulletin
Number:
747-28A2194
Date: August 3.1995
Revision 1: January 18,1996
ATA System: 2822
Summary
SUBJECT:
FUEL - DISTRIBUTION - FUEL BOOST AND OVERRlDUJElTlSON PUMPS - INSPECTION
BACKGROUND COMPLIANCE
This inspection will make sure the 747 fuel pumps Boeing recommends that the initial inspection be
will not cause a fuel leak. accomplished at the next opportunity when
manpower and facilities are available. For pumps
i
:
Operators have sent reports of fuel leaks at the fuel with insulation resistance between 1 and 5
boost and override/jettison pumps. The reports tell megohms when the 500VDC is done, it is
that eight fuel pumps have been removed for this recommended that the pump be replaced. If the
reason. The removed fuel pumps had between pump is not replaced, do the inspection of this pump
34,000-67,000 hours since new or since overhaul.
at every
A-check or an equivalent time. For pumps
The leaks occurred at the pump/wire bundle with insulation resistance greater than 5 megohms
interface. The resuft of one teak
was
a
fire at an
when the 5OOVDC is done, the inspection should be
inboard main tank jettison pump during repeated at every C-check or an equal time period
maintenance. after the initial inspection.
It is believed that after a long time, water can get
EFFECllVlTY
inside the potting of the wire terminal assembly and
cause corrosion. The corrosion in the wire terminal All 747 airplanes line positions 000 l-l 066.
assembly can cause arcing between the power pins
and the pump case. The arcing causes thermal
INDUSTRY SUPPORT INFORMATION
expansion of the materials inside the cap. This
expansion causes failure of the cap attachment
flange or the attaching screws and a subsequent I Boeing warranty remedies are not available for the
fuel leak. inspection given in this service bulletin.
High current during arcing can also melt a hole
through the pump end case and connector, which
also causes a fuel leak.
This service bulletin will test the pump wiring
insulation resistance
to make sure that no
conductive _ corrosion is in the wire terminal
assembly.
ACTION
Get access to all of the 747 fuel pumps. Do an
insulation resistance check on each pump. Replace
any pumps that do not pass the insulation resistance
check.
MANPOWER
Total Man-hours - 8 for each airplane without a
horizontal stabilizer fuel tank, body fuel tank or
auxiliary override/jettison pumps.
Elapsed Time - 4 Hours
Total Man-hours - 9 for each airplane with a
horizontal stabilizer fuel tank.
Elapsed Time - 4.5 Hours
Total Man-hours - 10 for each airplane with auxiliary
override/jettison pumps.
Elapsed Time - 5 Hours
Total Man-hours - 9 for each airplane with auxiliary
body fuel tanks.
Elapsed Time - 4.5 Hours
BOEING COMhtERClALAlRPlANE GROUP P.O. SOX 3707 SEATlIE. WASHlriGTON 93124-2207
Summary-
BOEING
SERVICE
BULLETIN 747-28A2194
MATERIAL INFORMATION
None
1
DO AN INSULATION RESISTANCE
CHECK ON EACH PUMP. REPLACE
ANY PUMPS THAT DO NOT PASS
THE INSULATION RESISTANCE
CHECK
JETTISON
OVERRIDE
HORIZONTAL STABILIZER
TANK TRANSFER PUHPS
(OPTIONAL)
NUMBER 1 MAIN TANK
AUXILIARY JETTISON
TANK BOOST PU PUHPS (OPTIONAL)
TRANSFER PURPS
(OPTIONAL) LEFT SIDE SHOWN
RIGHT SIDE OPPOSITE
Aug 3195
REV 1: Jan 18196
K3
m
Summary PagW
Commercial
Airplane
Group
747
Service Bulletin
Number: 747-28A2194
Date: August 3,1995
Revision 1: January 18,1996
ATA System: 2822
SUBJECT: FUEL - DISTRIBUTION - FUEL BOOST AND OVERRIDE/JETTISON PUMPS - INSPECTION
I. PLANNING INFORMATION
A. Effectivity
1. Airplanes
Refer to Service Bulletfn Index Document D&30300, Part 3 for Airplane Variable Number, Line
Number, and Serial Number data.
This service bulletin is for the airplanes shown below.
IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER
AAR AIRCRAFT TURBINE CENTER (RTC)
RBOOl
AER LINGUS (ARL)
RA203 RA501 -RA502
AEROLINEAS ARGENTINAS (ARG)
RD122-RD127
AIR ATLANTA ICELAA;;; (AID)
RA256
AIR CANADA (ACN)
RA743-RA745 RA744RA750 RD531 RTlOl-RT103
AIR CHINA GROUP (BEJ)
RD781-RD783 RG164 RG21 l-RG213 RR451 RT031-RT033 RT876RT880
AIR$‘;~4;lNTERNATIONAL (CLI)
AIR;L;;CE (AFA)
RA257-RA259 RA262-RA263 RA265 RD271-RD272 RD651-RD6ii
RD657-RD659 RD721-RD722 RD791-RD792 RR302-RR309 RR331 RR332
RS751-RS752 RT071-RT075 RT121 RT591 RT71 l-Rli’16
AIRz;6!yN S.A. (GBN)
AIR INDIA (AIN)
RA722-RA723 RA725RA726 RA728-RA731 RD051 RS781 -RS782 RUOOl-RU004
Aug 3195
747-28A2194
REV 1: Jan 18196 PagW
BOEING SERVICE BULLETIN 747-28A2194
AIRED;gGASCAR (MAD)
AIR;G;tJ;ITIUS LTD. (MAU)
AIR NEW ZEALAND, LTD. (ANZ)
RD471 -RD475 RT67 1 -RT673 RT703 RT932
ALITALIA (ALI)
RD181 RD451-RD456 RD751 RD753-RD755 RR561
ALL NIPPON AIRWAYS CO. LTD. (ANA)
RB683-RB697 RD231-RD235 RD461 RR551-RR556 RT751-Rl755 RT776-R-i777
RU831-RU841
AMERICAN INTERNATIONAL AIRWAYS, INC. (CKF)
RA521 RA523-RA525 RA635 RB002 RD201 RD203
AMl;;;;;GHT (ABD)
ARABL;;Sl\G INTERNATIONAL (AAB)
RB102
ASIANA AIRLINES (AAR)
RR746-RR747 RT131-RT134 RU031-RU032
ATA;t7C;SA, INC. (ATJ)
RA762 RB044
ATLAAAI INC. (TLS)
RD044 RD642-RD643 RD646 RD691-RD692 RD752
RR204
AVl;T$6; LEASING GROUP (ALW)
BRITISH AIRWAYS (BAB)
RA301-RA303 RA305RA308 RA310 RA312-RA318 RB41 l-RB413 RD131-RD141
RD143 RD311 RT471-RT499 RU121-RU123
CArDR?yN AIRLINES (CAM)
CANADIAN AIRLINES INTERNATIONAL LTD. (CDI)
RT701 -Rl702 RT704 RU059
CARGOLUX AIRLINES INTERNATIONAL S.A. (CLX)
RJ331 -RJ333 RR301 RR701 RR721-RR722
CATHAY PACIFIC AIRWAYS, LTD. (CAT)
RD351-RD358 RR441-RR442 RR531 RR951-RR952 RS301-RS306 RT451-RT469
,
.;
Aug 3/95
REV 1: Jan 18/96
K5
l
747-28A2 194
BOEING SERVICE BULLETIN 747028A2194
CHINA AIR LINES, INC. (CHI)
RD081-RD083 RD551 RG171-RG174 RR521-RR522 RT631-RT634 RT636
CITICORP AIRCRAFT MANAGEMENT, INC. (CIC)
RA559
CONTINENTAL AIRLINES, INC. (CAL)
RA217 RA551-RA552 RA561
CORSE AIR INTERNATIONAL (COR)
RA023 RA025 RA675 . RA677 RG124 RS235
DUB&d; WING (DAW)
RG193
EGYPTAIR (EGP)
RS731-RS732
EL AL ISRAEL AIRLINES, LTD. (ELA)
RA781-RA784 RB007 RJ151-RJ152 RR225RR226 RUOSl-RU083
EVA AIRWAYS CORPORATION (EVA)
RT161-RT166 RT951-RT954
EVE;At;FEN INTERNATIONAL Al;$EE. (EVR)
RA022 RA113 RA631 RA633
RB604 RB607 RDO41-RD042 RJ131 RJ133
FEDERAL EXPRESS (FED)
RR221-RR224 RR421
FLIyA;;iiN INTERNATIONAL, INC. (FLP)
GARUDA INDONESIAN AIRWAYS (GIA)
RD421-RD426 RT931 RU061-RU062
GAFA;;‘lTAL CORPORATlON (GAX)
RA216 RA245
GE :;;;;A’ AVIATION SERVICE&l,l&(GEH)
RA009 RR504
GENREF& ELECTRIC CORP. (GEC)
GOVERNMENT OF JAPAN (JAG)
RT681 -RT682
H.Mkro;gSULTAN’S FLIGHT (SFB)
RT440
lBERl15~lNEAS AEREAS DE ESPANA S.A.) (IBE)
RB421 RD431-RD435
INT;;;;;lONAL AIR LEASES (IAL)
Aug 3/95 747-28A2194
REV 1: Jan 18/96 ‘s
BOEING SERVICE BULLETIN 747-28A2194
IRAN AIR (FIN)
RAlOl-RA103 RA112 RA161-RA163 RB711 RD681-RD682 RGlOl-RG104
RJ301 RROOl-RR004
IRAQI AIRWAYS (IRC?)
RG095 RJ302-RJ303
JAPAN AIRLINES (JAL)
RA526-RA528 RA532-RA535 RA537-RA548 RB721-RB723 RD055 RD221-RD227
RR261-RR262 RR265RR267 RR361-RR362 RSOOl-RS002 RS251-RS259 RS263
RS265RS268 RT641-RT657 RT861-RT864 RT966RT967 RU801-RU809
yOgyN AIRLINES (KAZ)
KLM ROYAL DUTCH AIRLINES (KLM)
RD381-RD383 RD601-RD607 RS71 l-RS713 RTOOl-RTOll RT531-RT535
KOREAN AIR LINES, INC. (KAL)
RD053 RD071-RD072 RD091 RD441-RD442 RG221-RG222 RJ132
RR021-RR025 RR201 RR336 RS291-RS292 RS786 RT061
RT571 -RT586
LUFTHANSA GERMAN AIRLINES (DLH)
RD182-RD183 RD291-RD292 RD641 RD644-RD645 RD647-RD649 RD771-RD775
RR202-RR203 RR205RR206 RT041-RT047 RT431-RT439 RT441
MALAYSIAN AIRLINES SYSTEM BERHAD (MAS)
RD142 RD144 RS771 RT021-RT022 RT741-RI750
MARTINAIR HOLLAND N.V. (MTH)
RJ321-RJ322 RR31 0
MIDDLE EAST AIRLINES S.A. (MEA)
RD622-RD623
NO;rof3MERICAN AIRLINES, INC. (NNA)
NORTHWEST AIRLINES, INC. (NWA)
RA351 RA353 RA358 RA364RA373 RD241-RD243 RD251-RD262
RR005 RR341-RR345 RR431-RR432 RT401-RT410
OKADA AIR (OKD)
RA522
OLYMPIC AIRWAYS (OLY)
RD022 RD04&RD050
PAKISTAN INTERNATIONAL AIRLINES CORP. (PIA)
RDOO&RD004 RDlOl-RD104 RD701-RD702
Aug 3f95
REV 1: Jan 18/96 747-28A2 194
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BOEING SERVICE BULLETIN 747-28A2194
THEME& GROUP (AGJ)
THEX$i~2~ROUP/CAPITAL FINANCE CO. (TCI)
TOWER AIR, INC. (TOW)
RA012 RA015 RA024 RA034 RA106 RA201
RA309 RA311 RB003 RB005 RB042 RDOOl -RD002
RD047 RD052 RD054 RD571
TRANS WORLD AIRLINES. INC. (-i-WA)
RA104-RA105 RA107-kA1 ld
RA674 RD021
UNITED AIR LINES, INC. (UAL)
RA40&RA418 RA903-RA907
RG091 RT41 l-RT412
UNl;EZDo;ARCEL S;;;;K$E (UPS)
RA915RA916 RB605 RA029 RA033 RA901-RA902 RA911 -RA913
USAF - 747 E-4B PROGRAM (UOl)
RAi14 RA164 RA581-RA582 RA651
RBOlO-RB012 RD301-RD302 RD513-RD516 RGOOl-RG007
RT601 -RT622
RB013-RB016
VARIG AIRLINES (VAR)
RD581-RD583 RS331-RS333 RS721-RS722
VIRz;;;;LANTIC AIRWAYS LTD. (VAA)
RA702 RA909
WlLMlbIl~~ON TRUST CO. (VVX)
WORLDWIDE AIRCRAFT HOLDING CO (WAH)
RGOOS
.
1
d
.
RBOO&RB009 RD121 RT945RT946
Aug 3/95
REV 1: Jan 18/96 747-28A2194
t
BOEING SERVICE BULLETIN 747-28A2194
8. Reason
This inspection will make sure the 747 fuel pumps will not cause a fuel leak.
Operators have sent reports of fuel leaks at the fuel boost and override/jettison pumps. The reports
tell that eight fuel pumps have been removed for this reason. The removed fuel pumps had between
34,006-67,000 hours since new or since overhaul. The leaks occurred at the pump/wire bundle
interface. The result of one leak was a fire at an inboard main tank jettison pump during
maintenance.
It is believed that after a long time, water can get inside the potting of the wire terminal assembly and
cause corrosion. The corrosion in the wire terminal assembly can cause arcing between the power
pins and the pump case. The arcing causes thennal expansion of the materials inside the cap. This
expansion causes failure of the cap attachment flange or the attaching screws and a subsequent fuel
leak.
High current during arcing can also melt a hole through the pump end case and connector, which
also causes a fuel leak.
This service bulletin will test the pump wiring insulation resistance to make sure that no conductive
corrosion is in the wire terminal assembly.
Revision 1 is sent to add a check of the boost pump ground wire to the accomplishment instructions,
add an A-check inspection interval to the Compliance paragraph and add an optional off-wing
inspection of the fuel pumps. The accomplishment instructions format has been changed to agree
with Service Bulletin 757-28A0043. The data given in Notice of Status Change 747-28A2194 NSC 1
is included in this revision.
C. Description
Get access to all of the 747 fuel pumps. Do an insulation resistance check on each pump. Replace
any pumps that do not pass the insulation resistance check.
Revision 1 - No more work is necessary on airplanes changed as shown in the initial release of this
service bulletin.
PLEASE SEND A REPORT OF YOUR INSPECTION PROGRAM.
RESULTS WHEN EACH INSPECTION IS COMPLETE.
SEND TO:
BOEING COMMERCIAL AIRPLANE GROUP
ATTENTION: MANAGER, AIRLINE SUPPORT
D. Compliance
ALSO, SEND THE INSPECTION
Boeing recommends that the initial inspection be accomplished at the next opportunity when
manpower- and facilities are available, For pumps with insulation resistance between 1 and 5
megohms when the SOOVDC is done, it is recommended that the pump be replaced.
not replaced, do the inspection of this pump at every A-check or an equivalent time. If the pump is
For pumps with
inSUlatiOn resistance greater than 5 megohms when the SOOVDC is done, the inspection should be
repeated at every C-check or an equal time period after the initial inspection.
E.
Approval
This service bulletin was examined by the Federal Aviation Administration (FAA). The changes
specified in this service bulletin comply with the applicable Federal Aviation Regulations (FAR) and
are FAA approved. This service bulletin and the FAA approval were based on the airplane in its
original Boeing delivery configuration or as modified by other FAA approved Boeing changes.
Aug 3195
REV 1: Jan 18/96 747-28A2194
‘s,
I
BOEING SERVICE BULLETIN 747128492194
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.
F. Industry Support Information
Boeing warranty remedies are not available for the inspection given in this service bulletin.
Aug 3l95
REV
1:
Jan lW6
747-28A2194
‘9
BOEING SERVICE BULLETIN 747-28A2194
K. References
1. Existing Data:
a. 747 Maintenance Manual (AMM) Subject 20-41-01.28-22-03 and 28-31-01
b. 747-400 Maintenance Manual
(AMM)
Subject 20-41-01,28-l 7-04,28-22X)3 and 28-31-01
c. Standard Wiring Practices Manual (SWPM) Subject 20-20-00 and 20-60-01
d. 747 Corrosion Prevention Manual (D6-41910) Subject 20-40-00
2. Data supplied with this
service bulletin:
None
3. Installation Drawings:
None
L. Publications Changed
None
M. Electrical Load Data
Not changed
Aug 3/95
REV 1: Jan 18l96 747-28A2 194
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BOEING SERVICE BULLETIN 747-28A2194
II. MATERIAL INFORMATION
A. Parts Necessary For Each Airplane
I
New Q-rings are necessary if any fuel pumps are removed or replaced. Refer to the Accomplishment
Instructions, Note 2, Table
1
for the necessary AMM subjects to get the Q-ring part numbers.
6. Parts Necessary to Change Spares
None
C. Special Tools and Equipment
I
1.
A
special megohmmeter is necessary to do the electrical check of the fuel pump on the airplane.
The megohmmeter must have 1 OVDC and 500VDC voltage supply options with a maximum short
circuit current of 5 milliamperes. We use a QuadTech model 1864 megohmmeter. Any equivalent
meter is acceptable. The QuadTech model 1864 is available from:
QuadTech (OPK96)
100 Nickerson Road
Marlborough, Massachusetts USA 01752-4696
Attention: Tom Skarbek
Phone: (800) 253-l 230 or (508) 485-3500
Facsimile: (508) 485-0295
Test equipment for the low voltage orrwing safety check must be limited to a maximum NOTE: short circuit power dissipation of 0.05 Watts. Test equipment for the high voltage on-wing
check must be limited to a maximum short circuit power dissipation of 2.5 Watts.
2. A standard megohmmeter like the General Radio 1644A, or equivalent, may be used if the
insulation resistance test is done off of the airplane.
D. Existing Parts Accountability
None
. . .
>I
\(-\5
Aug 3195
REV 1: Jan 18/96 747-28A2 194
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BOEING SERVICE BULLETIN 747-28A2194
I
\
.
,
9.
h.
i.
j.
k.
CO0838, FUEL OVRD/JTSN PUMP FWD 3
C01673, PUMP JEST OVRD AUX TK 1 OUTBD (RD121 and RJ151 only)
CO1674, PUMP JETT OVRD AUX TK 4 OUTBD (RD121 and RJ151 only)
C01688, XFR PUMP 1 FWD BODY TK (RA161RA163, RD225RD227, RD231-RD235,
RD301-RD302, RS318-RS320 and RS699 ONLY)
C01689, XFR PUMP 1 AFT BODY TK (RA161-RA163 only)
2. On the P15 panel, open these circuit breakers and attach DO-NOT-CLOSE tags:
a. COO802, FUEL BOOST PMP MAIN FWD 1
b. COO804, FUEL BOOST PMP MAIN FWD 2
c. COO808, FUEL BOOST PMP MAIN AFT 3
d. COO810, FUEL BOOST PMP MAIN AFT 4
e. CO0836, FUEL OVRD/JTSN PUMP CTR RIGHT
f. CO0834, FUEL OVRD/JTSN PUMP AFT 2
g. CO0837, FUEL OVRDNTSN PUMP AFT 3
h. C01671, PUMP Jm OVRD AUX TK 1 INBD (RD121 and RJ151 only)
i. C01672. PUMP JETT OVRD AUX TK 4 INBD (RD121 and RJ151 only)
j. CO1690, XFR PUMP 2 MID BODY TK (RA161-RA163, RD225RD227, RD231-RD235,
RD301-RD302, RS318-RS320 and RS699 ONLY)
k. C01691, XFR PUMP 2 AFT BODY TK (RA161-RA163 only)
For the 747-400, open these circuit breakers:
1. On the P414 panel, open these circuit breakers and attach DC-NOT-CLOSE tags:
a. COO801, FUEL BOOST PMP MAIN AFT 1, position 85
b. COO803, FUEL BOOST PMP MAIN AFT 2,‘position R18
C. COO809, FUEL BOOST PMP MAIN FWD 3, position J5
cl. COO81 1, FUEL BOOST PMP MAIN FWD 4, position A8
e. CO0835, FUEL OVRD/JTSN PUMP CTR LEFT, position D2
f. CO0833, FUEL OVRDNTSN PUMP FWD 2, position C2
9. CO0838, FUEL OVRD/JTSN PUMP FWD 3, position C5
2. On the P415 panel, open these circuit breakers and attach DC-NOT-CLOSE tags:
a. COO802, FUEL BOOST PMP MAIN FWD 1, position 835
K 11’
-
Aug 3/95
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59
BOEING SERVICE BULLETIN
747-28A2194
b. COO804, FUEL BOOST PMP MAIN FWD 2, position G29
c. COO808, FUEL BOOST PMP MAIN AFT 3, position M29
d. COO81 0, FUEL BOOST PMP MAIN AFT 4, position A35
e. CO0836, FUEL OVRD/JTSN PUMP CTR RIGHT, position M32
f. CO0834, FUEL OVRD/JTSN PUMP AFT 2, position A38
g. CO0837, FUEL OVRD/JTSN PUMP AFT 3,.position 838
3. For airplanes with a horizontal stabilizer fuel tank, open these circuit breakers on the P85 panel
and attach DO-NOT-CLOSE tags:
a. C3141, HORIZ STAB XFER/JEiT PUMP L
b. C3142, HORIZ STAB XFEWJEIT PUMP R
E. Get access to the airplane fuel pumps. Refer to Table 1 for the fuel pump AMM references. In the
applicable AMM subjects, do the steps necessary to get access to the fuel pump electrical connector.
F. Do a visual inspection of the wire terminal assembly, the electrical connector and the wire insulation
on the’ fuel pump.
1. Examine the pump for the following conditions:
a. Signs of a fuel leak
b. Signs of heat discoloration
Clean the cap as given in Boeing Standard Wiring Practices Manual 20-60-01 after the NOTE: inspection for heat discoloration.
c. Signs of bulges, bent flanges, broken screw, medium to heavy corrosion damage (as specified
in the 747 Corrosion Prevention Manual Subject 20-40-00, Part I, General Information -
Corrosion Removal Techniques, Paragraph 3.A), etc.
2. If the results of the visual examination of the fuel pump are:
a. None of the conditions in paragraph F.l are found, go to paragraph G.
b. One or more of the conditions in paragraph F.l are found,
. 1) Replace the fuel pump.
2)
Go to paragraph G.
G. Do an insulation test of the fuel pump.
1. Disconnect the electrical connector of the fuel pump.
2. Use a AVIRON Model T477W bonding meter or an equivalent ohmmeter. Refer to Boeing
Standard Wiring Practices Manual 20-2M10, paragraph I.
3. Use the ohmmeter to measure the resistance between pin 4 of the electrical connector installed on
the pump and the braided bonding jumper. The braided bonding jumper is installed between the
pump motor impeller and the airplane structure.
K
18
c
Aug 3l95
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BOEING SERVICE BULLETIN 747-28A2194
8. If the pump was removed to do this test, install the pump. Refer to the AMM as specified in Table
1 to get the necessary instructions.
Refer to the AMM as specified in Table NOTE: New O-rings are required to install the fuel pump.
1
to get the part numbers for the O-rings.
If the pump was not removed to do this test, connect the electrical connector of the fuel pump.
9. Make sure all the fuel pumps are visually inspected and tested for insulation resistance.
a. If all fuel pumps had the visual inspection and krsulation resistance test done, the visual
inspection and insulation resistance test are completed. Go to paragraph H.
b. If the visual inspection and insulation resistance test was not done on any fuel pump, do a
visual and insulation resistance test on the pump that is not tested. Go to paragraph F.l.
H. Remove the DO-NOT-CLOSE identifiers and close the circuit breakers that were opened in Paragraph
D.
I. Put the airplane back into serviceable condition.
Aug 3/95
REV 1: Jan 18/96 747-28A2194
%L
BOEING SERVICE BULLETIN 747-28A2194
I
I
/
DO AN INSULATION RESISTANCE
CHECK ON EACH PUMP. REPLACE
ANY PUMPS THAT DO NOT PASS .
THE INSULATION RESISTANCE CHECK
SEE @
JETTISON
I II
/’ f$lHBER 1 HAIN TANK
TRANSFER PUHPS TANK BOOST PUMPS AUXILIARY JETTISON
PUMPS (OPTIONAL)
(OPTIONAL) LEFT SIDE SHOWN
RIGHT SIDE OPPOSITE
FIGURE 1. AIRPLANE FUEL PUMP INSPECTION
Aug 3/95
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BOEING SERVICE BULLETIN 747-28A2194
Aug 3195
WIRE BUNDLE C
WIRE
SEE
JMPER
CONNECTOR
JUHPER
TYPICAL
0
A
UIRE BUNDLE CAP ELECTRICAL CONNECTOR
BLACK 1
RED 2
GREEN
3
REGOHHWETER
JUMPER
FlGURti
1.
AIRPLANE FUEL
PUMP INSPECTION
SHEET2OF3
_ .- -
REV 1: Jan
l&96 747-28A2194
k
BOEING SERVICE BULLETIN 747-28A2194
BLANK PAGE
‘l-f!
.
FIGURE 1. AIRPLANE FUEL PUMP INSPECTION
Aug 3/95
REV 1: Jan 18/96 SHEET 3 OF 3
y-as’
747-28A2 194
20
747 FUEL PUMP INSPECTION DATA SHEET
AIRPLANE TAIL NBR: HRSICYCLES: DATE:
PUMP NAME INSTALLED PUMP
GRND
RESISTANCE IN MEGOHMS
RESIS
NEW PUMP
TANCE
(INSULATION CHECK) (IF NECESSARY)
PART SERIAL TSOnSN otYNm 10 VDC
500
VDC PART SERIAL
NBR. NBR.
OVHUNEW
. NBR. NBR.
PIN4 PIN 1 PIN 2 PIN 3 PIN 1 PIN 2 PIN 3
NBR 1 MAIN FWD BOOST
PUMP
E MA’N AFr B00sT
NBR 2 MAIN FWD BOOST
PUMP
NBR 2 MAIN AFT BOOST
PUMP
NBR 2 MAIN OUTBOARD
OVRD/JEfTlSON PUMP
NBR 2 MAIN INBOARD
OVRDNETTISON PUMP
CTR WING TANK LEFT
OVRD/JElTlBON PUM’
CTR WING TANK RIGHT
DVRWJEITISON PUMP
NBR 3 MAIN FWD BOOST
PUMP
NBR 3 MAIN AFT BOOST
PUMP
.
INSTALLED PUMP
RESlS
TANC
E IN
RESISTANCE IN MEGOHMS
I
NEW PUMP
(IF NECESSARY)
PART SERIAL
NBR. NBR.
500 VDC
TSOITSN PIN PIN PIN PIN PIN PIN PIN PART SERIAL
0vttuNEw 4 1 2 3 1 2 3 NBR. NBR.
PUMP NAME
ZEN&l MAIN FWD BOOST
I I
NBR 4 MAIN AFT BOOST
PUMP
HORlZONTAL STAB TANK
LEFT TRANSFER PUMP
HORKONTAL STAB TANK
RIGHT TRANSFER PUMP
INSERT DATA FOR ANY BODY TANK TRANSFER PUMPS OR RESERVE TANK OVERRIDWElTlSON PUMPS IN THE UNES THAT FOLLOW:
PLEASE SEND TO:
BOEING COMMERCIAL AIRPLANE GROUP
All-N: ROY COTTON M/S 04-EC
P.O. BOX 3707
SEATTLE, WASHINGTON 98124-2207
,‘L m!m!aisHi
Commercial
Airplane
747
.I
i. Group
Service Bulletin
Number:
747-28A2194
Evaluation Form
Date: August 3,1995
Revision 1: January 18,1998
ATA System: 2822
Prepared By: Bill Bottenberg
1 SUBJECT: FUEL - DISTRIBUTION - FUEL BOOST AND OVERRIDE/JET-TISON PUMPS - INSPECTION 1
Use this evaluation form to tell us what you think of the quality of this service bulletin. We will use the data
that you give us to improve the qualii of our service bulletins. Please include data about these or other
items:
- Did this service bulletin meet your estimate of qualii
- How easy is this service bulletin to understand?
- Are the Planning Information, Material Information and Accomplishment Instructions satisfactory7
- will you do this service bulletin fully? If not, please tell us why.
- Is the Manpower estimate satisfactory?
NOTE: Plea’se do not use this evaluation form to tell us to make changes to your manuals. To make these
changes, please use a Publication Change Request (PCR) form.
Please give us this data:
OPERATOR: TODAY’S DATE:
- .
3.
.i PREPARED By: TITLE:
ORGANIZATION: TELEX CODE:
TELEPHONE NUMBER: BASE:
COMMENTS:
lf necessary, please use the other side. Thank you for the time you used to give us your comments.
Give the completed evaluation form to your Boeing Field Service Representative or send the evaluation form
directly to this address: TJ. Taylor, Manager
Service Bulletin Engineering
Boeing Commercial Airplane Group
P.O. Box 3707, Mail Stop 29-85
Seattle, WA 981242207
BOEING COMMERCIAL AIRPlANE GROUP P.O. BOX 3707 SEATTLE, WASHItiGTON 98124-2207

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