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A
747-400
MAINTENANCE MANUAL
~................................................................. | | | | Boost Pump Access | Boost Pump | | | Number | ................................................................... | Boost Pump Access Door, 545CB | MAIN 1 FWD | | Boost Pump Access Door, 545DB | MAIN 1 AFT | | Left Wing Fuselage Fairing, Access Door, 511FB | MAIN 2 FWD | | Wing Landing Gear Wheel Well, Left | MAIN 2 AFT | | Right Wing Fuselage Fairing, Access Door, 611FB | MAIN 3 FWD | | Wing Landing Gear Wheel Well, Right | MAIN 3 AFT | | Boost Pump Access Door, 645CB | MAIN 4 FWD | | Boost Pump Access Door, 645DB | MAIN 4 AFT | 2...................................................….............1
Table 601A
~................................................................. | | Ovrd/Jett. | | Override/Jettison Pump Access | Pump | | | Number | ................................................................... | Wing Landing Gear Wheel Well, Left | Left Center | | Wing Landing Gear Wheel Well, Right | Right Center| | Wing Landing Gear Wheel Well, Left | MAIN 2 FWD | | Wing Landing Gear Wheel Well, Left | MAIN 2 AFT | | Wing Landing Gear Wheel Well, Right | MAIN 3 FWD | | Wing Landing Gear Wheel Well, Right | MAIN 3 AFT | 2...................................................….............1
Table 601B
S 216-012
(2)
At each pump, do a visual inspection of the wire terminal assembly (Fig. 601, View A).
(a)
Look for these conditions: 1) Indication that fuel has leaked from the wire terminal assembly.
2) Indication that the terminal assembly or wire insulation is discolored because of too much heat. a) Clean the wire bundle caps per SWPM 20-60-01.
3) Indication of damage to the wire terminal assembly, for example: a) bulges b) bent flanges c) broken screws d) medium to heavy corrosion damage (reference the 747
Corrosion Prevention Manual, CPM 20-40-00, Part I, General Information - Corrosion Removal Techniques, Paragraph 3.A).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 216-013
(3)
If the visual check shows that the fuel pump is OK, do this
procedure: Fuel Pump Continuity Check.
S 216-038
(4)
If the visual check shows that the fuel pump is not OK, do these steps:
(a)
Replace the applicable fuel pump motor/impeller unit.
NOTE: Refer to Table 602 for the AMM procedure reference.
____
(b)
Do the continuity/resistance checks for the replacement fuel pump. 1) Start with this procedure: Fuel Pump Continuity Check.
H.
Fuel Pump Continuity Check
S 016-039
(1) Disconnect the electrical connector from the pump motor/impeller unit.
S 866-040
WARNING: MAKE SURE THE METER USED TO MEASURE THE BONDING JUMPER
_______ CONTINUITY IS RESISTANT TO EXPLOSION. IF NOT, IT IS POSSIBLE THAT AN EXPLOSION OR FIRE CAN OCCUR.
(2)
Use the AVTRON Model T477W bonding meter (SWPM 20-20-00, para I).
S 766-041
(3)
Measure the resistance between pin 4 of the electrical connector and the braided bonding jumper on the fuel pump (Fig. 601, View B).
NOTE: The measurement between pin 4 and the bonding jumper is a
____ continuity check, not a bonding resistance check.
S 766-042
(4)
Record the resistance measured between pin 4 and the braided bonding jumper on the data sheet (Fig. 602).
S 766-043
(5)
If the resistance is less than or equal to 1.99 ohms, do this procedure: Initial Insulation Resistance Check.
S 766-044
(6)
If the resistance is more than 1.99 ohms, do these steps:
(a) 中國航空網(wǎng) www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊(cè) 燃油 FUEL 2(101)
