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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