(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

 D.
Procedure

 S 484-048
 (1)  
Put a cord or stiff wire in the conduit (1) to pull the wiring from the rear spar to the main tank boost pump.

 S 824-022

 (2)  
Put the conduit (1) into position and make sure the cord or stiff wire extends through the conduit at the rear spar and at the main fuel tank boost pump.

 (a)  
If it is necessary, install the packing (15), rings (14), retainers (16) and coupling nuts (17,18) to connect the two pieces of conduit (1).

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747-400
MAINTENANCE MANUAL

 S 424-039

 (3)  Install the conduit (1) on the rear spar with the washer (8), new
 o-ring (7) and wiggins fitting (6).
 S 424-040
 (4)  Install the clamp (2) onto the conduit with the screw (3), washer
 (4) and nut (5).
 S 164-026
 (5)  Clean tubing bonding surfaces and the structure at the hole where
 the bonding jumper is installed.
 S 424-041
 (6)  Install the clamp (13) for the bonding jumper (9).
 S 424-042
 (7)  Install the bonding jumper (9).
 S 424-043
 (8)  Install the washers (10), screw (12) and nut (11).
 S 764-029
 (9)  Do a check of the bonding resistance between tubing and structure
 (SWPM 20-20-00).
 NOTE:____ Bonding resistance should not exceed 0.010 ohm.

 S 414-047
 (10)
 Attach the wiring to the cord or stiff wire and pull the wiring through the conduit to the main tank boost pump.

 S 214-060

 (11)
 Make sure both teflon sleeves for the main tank boost pump wiring are visible.

 S 214-061

 (12)
 Install the wire bundle clamp.

 (a)
Make sure the two sleeves go through the clamp.

 S 414-046
 (13)
 Install the electrical connector on the main tank boost pump.

 S 414-030

 (14)
 Close and go out of the tank (AMM 28-11-00/201).

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747-400 MAINTENANCE MANUAL
 S 714-059
 (15)
 Do an operational test for the No. 1 and 4 main tank boost pumps (AMM 28-22-03/401).

 E.
Put the Airplane Back to Its Usual Condition

 S 414-001
 (1)
Install applicable access panel 545BB/645BB (AMM 28-11-02/401).

 S 414-050

 (2)
Install the applicable boost pump access door, 545CB or 645CB.

 S 414-051

 (3)
Install the applicable boost pump access door, 545DB or 645DB.

 S 414-057

 (4)
Close the applicable access panel 572GB/672GB (AMM 06-09-08/201).

 S 444-058

 (5)  
Activate the Inboard Trailing Edge Flaps (AMM 27-51-00/201).

 S 864-002

 (6)  
Close 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

 (7)  
　
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