D.
Main Tank Boost Pump Conduit Removal
S 864-010
(1)
Make sure these circuit breakers are open:
(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 864-011
(2)
Disconnect the electrical connector from the applicable main tank boost pump.
(3)
Remove the wire bundle clamp at the main tank boost pump.
(4)
Remove the wire bundle clamp at the rear spar.
S 024-054
S 024-049
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28-22-06
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 024-045
(5) Pull the wires through the conduit to the rear spar.
S 014-013
(6) Go into the No. 2 or 3 inboard main fuel tank to get access to the
conduit (AMM 28-11-00/201).
NOTE:____ The conduit for the No. 1 and 4 main tank boost pump is
located in the No. 2 and 3 inboard fuel tanks.
S 214-014
(7)
Find the No. 1 or 4 main tank boost pump conduit.
S 024-037
(8)
Remove the screw (12), washers (10) and nut (11) at the bonding jumper (9).
S 024-038
(9)
Remove the bonding jumper (9).
S 024-031
(10)
Remove the clamp (13).
S 024-032
(11)
Remove the screw (3), washers (4) and nut (5).
S 024-033
(12)
Remove the clamp (2).
S 024-034
(13)
Disconnect the coupling nuts (17,18) at the main fuel boost pump end of the conduit (1).
S 024-035
(14)
Remove the retainers (16), packing (15) and rings (14).
S 024-036
(15)
Remove the wiggins fitting (6), o-ring (7) and washer (8) at the rear spar end of the conduit (1).
S 014-020
(16)
Remove the conduit (1).
(a)
If it is necessary, disconnect the coupling nuts (17,18) to separate the two sections of the conduit (1).
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28-22-06
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A
747-400 MAINTENANCE MANUAL
(b) Remove the retainers (16), packing (15) and rings (14).
TASK 28-22-06-404-021
3. Main Tank Boost Pump Installation (Fig. 401)_________________________________
A. Equipment
(1)
Bonding Meter (AMM 20-22-01/601)
(2)
Cord or stiff wire
B.
References
(1)
AMM 06-09-08/201, Wing Access Doors and Panels
(2)
AMM 27-51-00/201, Trailing Edge Flaps
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 28-11-00/201, Fuel Tanks
(5)
AMM 28-11-02/401, Main Tank Access Panels
(6)
AMM 28-22-03/401, Main Tank Boost Pump Motor/Impeller Unit
(7)
SWPM 20-20-00, Standard Wiring Practices Manual
C.
Access
(1)
Location Zones 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right
