28-15-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 655-103
 (2)  Makes sure there is a maximum of 60,000 lbs (27,000 kgs) of fuel in the No. 2 and 3 main tanks.
 NOTE:____ This step will open the scavenge system float valves in the No. 2 and 3 main tanks (at nominal ground attitude, 0.5 degree nose down, 0 degree roll - wings level).
 S 715-104
 (3)  Put these crossfeed valve switches to the ON position: (a) FUEL X FEED 1 (b) FUEL X FEED 2 (c) FUEL X FEED 3 (d) FUEL X FEED 4
 S 715-105
 (4)  Put these boost pump switches to the ON position: (a) MAIN 1 FWD (b) MAIN 1 AFT (c) MAIN 4 FWD (d) MAIN 4 AFT
 S 715-106
 (5)  Let the pumps operate for 30 minutes.
 S 715-107
 (6)  Do a check of the fuel quantities: (a) Make sure the No. 2 main tank fuel quantity does not increase. (b) Make sure the No. 3 main tank fuel quantity does not increase. (c) Make sure the fuel quantity in the center wing tank does not increase.
 S 715-108
 (7)  Put these boost pump switches to the OFF position: (a) MAIN 1 FWD (b) MAIN 1 AFT (c) MAIN 4 FWD (d) MAIN 4 AFT
 S 715-109
 (8)  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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 G. Fuel Scavenge System Inboard Main Tank Float Valve Operational Test
 S 655-110
 (1)  Defuel or transfer fuel to make sure that the fuel quantity in the center wing tank is between 1000 and 4000 lbs (500 and 1800 kgs (AMM 12-11-01/301, AMM 28-26-00/201).
 NOTE: This step opens the scavenge system float valves in the
____ center wing tank (at nominal ground attitude, 0.5 degree nose down, 0 degree roll - wings level).
 S 655-111
 (2)  Add or transfer fuel to make sure that there is a minimum of 70,000 lbs (32,000 kgs) of fuel in the No. 2 and 3 main tanks (AMM 12-11-01/301, AMM 28-26-00/201).
 NOTE: This step closes the scavenge system float valves in the
____ No. 2 and 3 main tanks (at nominal ground attitude, 0.5 degree nose down, 0 degree roll - wings level).
 S 715-112
 (3)  
Put these crossfeed valve switches to the ON position:

 (a)  
FUEL X FEED 1

 (b)  
FUEL X FEED 2

 (c)  
FUEL X FEED 3

 (d)  
FUEL X FEED 4

 S 715-113
 (4)  
Put these boost pump switches to the ON position:

 (a)  
MAIN 1 FWD

 (b)  
MAIN 1 AFT

 (c)  
MAIN 4 FWD

 (d)  
MAIN 4 AFT

 S 715-114
 (5)  
Wait for 30 minutes.

 S 715-115

 (6)  
Do a check of the inboard main tank fuel quantities:

 (a)  
Make sure the fuel quantity in the No. 2 main tank does not increase.

 (b)  
Make sure the fuel quantity in the No. 3 main tank does not increase.

 S 715-116
 (7)  
Put these boost pump switches to the off position:

 (a)  
MAIN 1 FWD

 (b)  
MAIN 1 AFT

 (c)  
MAIN 4 FWD

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (d)  MAIN 4 AFT
 S 715-117
 (8)
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

 H.
Put the Airplane Back to Its Usual Condition
　
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