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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-06
 ALL  ú ú 01 Page 605 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
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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