B.  
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

 (2)  
Access Panels 545BB Access Panel 545CB No. 1 Main Tank Fwd Boost Pump Access Panel 545DB No. 1 Main Tank Aft Boost Pump Access Panel 572GB No. 1 Main Tank Boost Pump Access Door - Rear Spar 645BB Access Panel 645CB No. 4 Main Tank Fwd Boost Pump Access Panel 645DB No. 4 Main Tank Aft Pump Access Panel 672GB No. 4 Main Tank Boost Pump Access Door - Rear Spar

 C.  
Preparation for Main Tank Boost Pump Conduit Removal

 (1)
Defuel the No. 2 and 3 inboard main fuel tank (AMM 28-26-00/201).

 S 654-006
 S 044-055
 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.
 (2) Deactivate the Inboard Trailing Edge Flaps (AMM 27-51-00/201).
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A

747-400
MAINTENANCE MANUAL

CONDUIT SEE A
LEFT SIDE IS SHOWN (RIGHT SIDE IS ALMOST THE SAME)
NO. 1 OR NO. 4
MAIN TANK

NO. 2 OR NO. 3 MAIN TANK
FWD
COUPLING
SEE D
INBD
WIRE BUNDLE SEE B
CONDUIT A
Main Tank Boost Pump Wire Bundle Conduit Installation
Figure 401 (Sheet 1)

H77447
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747-400
MAINTENANCE MANUAL

COUPLING SEE
D
2.
 CLAMP

3.
 SCREW

Main Tank Boost Pump Wire Bundle Conduit Installation

Figure 401 (Sheet 2)

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H78470
A
747-400
MAINTENANCE MANUAL

9.  
BONDING
JUMPER

10.
 WASHER

11. NUT
12.
 SCREW

13.
 CLAMP

1. CONDUIT
BONDING JUMPER
17. COUPLING
C  NUT
14. RING
16. RETAINER
15. PACKING
15. PACKING
1.  WIRE BUNDLE CONDUIT
18.  COUPLING NUT
FERRULE
16. RETAINER
14. RING
COUPLING D
Main Tank Boost Pump Wire Bundle Conduit Installation Figure 401 (Sheet 3)
H77476
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MAINTENANCE MANUAL

 S 014-056
 (3)
Open the applicable access panel 572GB/672GB (AMM 06-09-08/201).

 S 014-007

 (4)  
Remove access door 545BB or 645BB to gain access to the conduit (AMM 28-11-02/401).

 S 014-053

 (5)  
If you will replace the conduit for the forward boost pumps, remove the applicable boost pump access door, 545CB or 645CB.

 S 014-052

 (6)  
If you will replace the conduit for the aft boost pumps, remove the applicable boost pump access door, 545DB or 645DB.

 S 684-062
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND GO INTO
　
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