S 864-003
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
 MAIN TANK BOOST PUMP WIRING - INSPECTION/CHECK
______________________________________________
 1.  General
_______
 A.  This procedure contains instructions to do an inspection/check of the wiring and conduit for the No. 1 and 4 main tank boost pump.
 B.  The main tank boost pumps are found at the outboard end of the inboard main fuel tanks, installed in housings connected to the boost pump dry bay walls.
 C.  The No. 1 and 4 main tank boost pump wiring is installed with a double layer of teflon sleeving in the conduit. The sleeving is installed to prevent arcing between the boost pump power wiring and the conduit caused by chafed wires.
 D.  The conduit for the No. 1 and 4 main tank boost pump are found in the No. 2 and 3 inboard fuel tanks.
 E.  Access to the No. 1 and 4 main tank boost pumps is through the boost pump dry bay access doors.
 F.  The main tank boost pumps will be referred to as the boost pumps in this procedure.
 TASK 28-22-06-206-001
 2.  Examine the Conduit Wire Bundle for the Boost Pump
__________________________________________________
 A.  References
 (1)
AMM 06-09-08/201, Wing Access Doors and Panels

 (2)
AMM 07-11-08/201, Cargo and Fuel Loading Support

 (3)
AMM 12-11-01/301, Fuel Servicing

 (4)
AMM 24-22-00/201, Manual Control

 (5)
AMM 27-51-00/201, Trailing Edge Flaps

 (6)
AMM 28-11-02/401, Reserve and Main Tank Access Doors

 (7)
AMM 28-22-03/401, Main Tank Boost Pump Motor/Impeller Unit

 (8)
AMM 28-22-06/401, Main Tank Boost Pump Conduit

 (9)
AMM 28-26-00/201, Defuel

 (10)
 SWPM 20-10-13

 (11)
 SWPM 20-10-18

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

 C.  
Prepare for the Boost Pump Wire Bundle Inspection

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 28-22-06
 ALL  ú ú 01 Page 601 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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 
INBD 

WIRE BUNDLE SEE B
CONDUIT A
Main Tank Boost Pump Wire Bundle Figure 601 (Sheet 1)
H77574
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-06
 ALL  ú ú 01 Page 602 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

CONDUIT

TEFLON
TEFLON
SLEEVE
SLEEVE
WIRE BUNDLE

Main Tank Boost Pump Wire Bundle
Figure 601 (Sheet 2)

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