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28-22-06 ALL ú ú 01 Page 603 ú Oct 15/98 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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).
(2) Open the applicable access panel 572GB/672GB (AMM 06-09-08/201).
(3) Remove the applicable boost pump access door, 545CB/645CB or 545DB/645DB (AMM 28-11-02/401).
(4) Open the applicable access panel 572GB/672GB (AMM 06-09-08/201).
(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28-22-06 ALL ú ú 01 Page 604 ú Feb 18/00 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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.
(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.
(2) Inspect the teflon sleeves for damage.
(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.
(2) Repair or replace damaged wires (SWPM 20-10-13).
(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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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 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 燃油 FUEL 3
