NOTE: This will make sure the scavenge system float valves in
____ the No. 2 and 3 main tanks are open (at a nominal ground attitude, 0.5 degree nose down, 0 degree roll - wings level).
 (b)  Minimum of 2500 lbs (1200 kgs)
 NOTE: Enough fuel to operate the boost pumps.
____
 S 865-091
 (5)  Make sure the fuel strainers are installed in the fuel strainer housing assemblies (AMM 28-15-00/201).
 NOTE: The scavenge system for the center wing tank does not operate
____
 if the fuel strainers are not installed.

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747-400 MAINTENANCE MANUAL
 E. Fuel Scavenge System - Fuel Transfer Operational Test
 S 715-128
 (1)
Record the fuel quantity for these fuel tanks:

 (a)
Center Wing Tank: ___________________

 (b)
No. 2 main tank:  ____________________

 (c)
No. 3 main tank:  ____________________

 S 715-092
 (2) Put these crossfeed valve switches to the ON position.
 NOTE: The crossfeed valve switches are found on the fuel
____ management control module, M154 (overhead panel, P5).
 (a)
FUEL X FEED 1

 (b)
FUEL X FEED 2

 (c)
FUEL X FEED 3

 (d)
FUEL X FEED 4

 S 715-093
 (3) Put these boost pump switches to the ON position:
 NOTE: The boost pump switches are found on the fuel management
____
 control module, M154.

 (a)
MAIN 2 FWD

 (b)
MAIN 2 AFT

 (c)
MAIN 3 FWD

 (d)
MAIN 3 AFT

 S 715-094
 (4)
Do these steps to test the CWT to main tank fuel scavenge rate:

 (a)
Let the pumps operate for 30 minutes.

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747-400 MAINTENANCE MANUAL
 (b)  
Start the stopwatch after the first increase in MAIN 2 and MAIN 3 fuel quantity.

 (c)  
Make sure the MAIN 2 fuel quantity increases by a minimum of 200 lbs (100 kgs) in 30 minutes.

 (d)  
Make sure the MAIN 3 fuel quantity increases by a minimum of 200 lbs (100 kgs) in 30 minutes.

 S 715-126
 (5)  
Record the fuel quantity transfer in 30 minutes:

 (a)  
No. 2 main tank: ___________________

 (b)  
No. 3 main tank: ___________________

 S 715-127
 (6)  
Make sure the difference in fuel quantity between MAIN 2 and MAIN 3 is not more than 25%.

 S 715-125

 (7)  
Make sure the fuel quantity in the center wing tank did not
 increase.

 S 715-100

 (8)  
Put these boost pump switches to the off position.

 (a)  
MAIN 2 FWD

 (b)  
MAIN 2 AFT

 (c)  
MAIN 3 FWD

 (d)  
MAIN 3 AFT

 S 715-101
 (9)  
Put these crossfeed valve switches to the off position:

 (a)  
FUEL X FEED 1

 (b)  
FUEL X FEED 2

 (c)  
FUEL X FEED 3

 (d)  
FUEL X FEED 4

 F.
Fuel Scavenge System Center Wing Tank Float Valve Operational Test

 S 655-102
 (1)  Add or transfer fuel to make sure that there is a minimum of 10,000 lbs (5000 kgs) of fuel in the center wing tanks (AMM 12-11-01/301, AMM 28-26-00/201).
 NOTE: This step will close the scavenge system float valves in the
____ center wing tank (at nominal ground attitude, 0.5 degree nose down, 0 degree roll - wings level).
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