S 655-118
 (1)  
Refuel the fuel tanks if no more work is necessary (AMM 12-11-01/301).

 S 865-119

 (2)  
Remove the electrical supply if it is not necessary (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 SCAVENGE SYSTEM FUEL LINE - REPAIRS
___________________________________
 TASK 28-15-03-308-001
 1.  Scavenge System Fuel Line Repair________________________________
 A. General
 (1)  For the repair of the fuel line procedure, refer to the OHM 28-00-10.
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747-400
MAINTENANCE MANUAL

 SCAVENGE SYSTEM JET PUMP - REMOVAL/INSTALLATION
_______________________________________________
 1.  General_______
 A.  This procedure has two tasks:
 (1)  
The removal of the jet pump(s) for the hydromechanical scavenge system in the center wing tank (jet pump).

 (2)  
The installation of the jet pump(s) for the hydromechanical scavenge system in the center wing tank.

 B.  
There are four jet pumps in the center wing tank. The jet pumps are attached to the left and right lower panel intercostals that are farthest outboard (forward and aft of the mid spar of the center wing tank) (Fig. 401).

 C.  
To get to the jet pumps you must go through the center wing tank access door and the spanwise beam access doors.

 TASK 28-15-10-004-027
 2.  Jet Pump Removal (Fig. 401)________________
 A.  General
 (1)
The removal of all four of the jet pumps is almost the same.

 B.  
References

 (1)  
AMM 28-11-00/201, Fuel Tanks

 (2)  
AMM 28-11-09/401, Spanwise Beam Access Door

 (3)  
AMM 28-26-00/201, Defueling

 C.  
Access

 (1)  
Location Zones
 131 Center Section Wing Box, Left
 132 Center Section Wing Box, Right

 (2)  
Access Panels
 131EZ Center Wing Tank Access Door
 132CZ Center Wing Tank Access Door
 131AZ Spanwise Beam Access Door
 131BZ Spanwise Beam Access Door
 131CZ Spanwise Beam Access Door
 132AZ Spanwise Beam Access Door

 D.  
Prepare for the Removal

 (1)  
Defuel the center wing tank (AMM 28-26-00/201).

 S 654-002
 S 864-003
 WARNING:_______OBEY ALL THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. YOU CAN CAUSE AN INJURY TO A PERSON AND CAUSE DAMAGE TO THE AIRPLANE.
 (2)  Remove all the fuel in the center wing tank and prepare the center wing tank for an entry (AMM 28-11-00/201).
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747-400 MAINTENANCE MANUAL
 S 864-004
 (3)  
Go into the center wing tank.

 S 014-005

 (4)  
Remove the spanwise beam access doors 131AZ and 131BZ (AMM 28-11-09/401).

 S 014-028

 (5)  
To get to the aft jet pump(s), remove these spanwise beam access doors (AMM 28-11-09/401):

 (a)  
131CZ (fuel scavenge system into the No. 2 main tank)

 (b)  
132AZ (fuel scavenge system into the No. 3 main tank).

 E.
Remove the Jet Pump(s)

 S 034-023
 (1)  
Disconnect or loosen the bonding jumpers and the tube support brackets if it is necessary.
　
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