28-22-06
ALL ú ú 01 Page 603 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H78210
A
747-400 MAINTENANCE MANUAL
S 046-043
WARNING: YOU MUST CAREFULLY DO THE STEP BELOW TO PREVENT ACCIDENTAL
_______ MOVEMENT OF THE TE FLAPS. THE TE FLAPS CAN MOVE AND CAUSE DAMAGE TO EQUIPMENT OR INJURY TO PERSONNEL.
(1)
Deactivate the inboard trailing edge flaps (AMM 27-51-00/201).
S 016-047
(2)
Open the applicable access panel 572GB/672GB (AMM 06-09-08/201).
S 016-048
(3)
Remove the applicable boost pump access door, 545CB/645CB or 545DB/645DB (AMM 28-11-02/401).
S 016-040
(4)
Open the applicable access panel 572GB/672GB (AMM 06-09-08/201).
S 016-004
(5)
Open the applicable circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P180 DC Power Distribution Panel
1) 180E4 FUEL BOOST PMP CONT AFT 1 AND FWD 4
2) 180E19 FUEL BOOST PMP CONT FWD 1 AND AFT 4
(b)
P414 Power Distribution Center - Left
1) 414B5 FUEL BOOST PUMP MAIN AFT 1
2) 414A8 FUEL BOOST PUMP MAIN FWD 4
(c)
P415 Power Distribution Center - Right
1) 415B35 FUEL BOOST PUMP MAIN FWD 1
2) 415A35 FUEL BOOST PUMP MAIN AFT 4
S 026-005
(6)
Disconnect the electrical connector from the boost pump.
(7)
Remove the wire bundle clamp inside the boost pump housing.
(8)
Attach a cord to the wire bundle at the boost pump end.
S 026-006
S 826-007
NOTE: The cord length must be sufficient to go through the conduit
____ from the boost pump to the rear spar. You will use the cord to pull the wiring back through the conduit.
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28-22-06
ALL ú ú 01 Page 604 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 026-008
(9)
Remove the wire bundle clamp at the rear spar.
S 026-009
(10)
Carefully pull the wiring through the conduit.
NOTE: It is possible for the boost pump connector to go through the
____
conduit.
D. Inspect the Teflon Sleeves
S 026-010
(1)
Remove the teflon sleeves.
S 216-011
(2)
Inspect the teflon sleeves for damage.
S 966-039
(3)
Replace the teflon sleeve(s) if the material is damaged, missing or not long enough (SWPM 20-10-18).
E.
Inspect the Boost Pump Conduit Wiring
S 216-049
(1)
Inspect the wiring for damage.
S 216-050
(2)
Repair or replace damaged wires (SWPM 20-10-13).
S 206-041
(3)
If the wiring damage is caused by arcing, then do these steps:
NOTE: Arcing can show as very small blackened holes in the
____ insulation or as deformation or pitting of the copper wire. Worn areas with a black material around the edge is not a sign of arcing (the black material is aluminum oxide).
(a) Repair or replace the damaged wiring (SWPM 20-10-13).
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747-400 MAINTENANCE MANUAL
(b)
Replace the teflon sleeves (SWPM 20-10-18).
(c)
Replace the conduit for the applicable No. 1 or 4 boost pump (AMM 28-22-06/401).
NOTE: The conduit does not need to be replaced immediately if
____ there is no evidence of fuel leakage inside the conduit. To determine if there is fuel leakage, do the subsequent procedure: Boost Pump Conduit Leak Check.
F. Boost Pump Conduit Leak Check
NOTE: Use one of these methods to determine if there is fuel leakage in
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