28-31-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 2) OVRD 2 AFT
 3) OVRD 3 FWD
 4) OVRD 3 AFT

 G.  Fuel Transfer Test - Jettison Transfer Valve for the No. 2 Main Tank -Valve Open
 S 715-249
 (1)  Do these steps to open the jettison transfer valve in the No. 2 main tank.
 NOTE: The jettison transfer valve is manually opened to make sure
____ the valve body and valve shaft are installed correctly. Test one jettison transfer valve at a time.
 (a)  
Have a person go out to the rear spar area in the wheel-well for the left wing landing gear.

 (b)  
Find the jettison transfer valve actuator for the No. 2 main tank (adjacent and outboard of the aft override/jettison pump).

 (c)  
Push the manual lever on the jettison transfer valve actuator to the OPEN position.

 S 715-233
 (2)
Make sure the MAIN 1 refuel valve switch is in the OPEN position.

 S 715-226

 (3)  
Put these override/jettison pump switches on the fuel manangement control module, M154, to the ON position:

 (a)  
OVRD 2 FWD

 (b)  
OVRD 2 AFT

 S 715-227
 (4)  
Monitor the fuel synoptic.

 (a)  
Make sure the fuel quantity for the No. 1 main tank increases.

 (b)  
Transfer a minimum of 600 lbs (300 kgs) of fuel.

 NOTE: The fuel transfer with the jettison transfer valve
____ completely open should take approximately one minute.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-31-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 715-228
 (5)  
If the fuel quantity in the No. 1 main tank increases, the jettison transfer valve for the No. 2 main tank is in the open position.

 S 715-229

 (6)
Close these switches on the fuel management control module, M154:

 (a)  
OVRD 2 FWD

 (b)  
OVRD 2 AFT

 S 715-231
 (7)  
Have the person at the refuel control panel, P42, put the MAIN 1 refuel valve switch to the CLOSED position.

 S 715-232

 (8)  
Put the manual lever on the jettison transfer valve to the CLOSED position.

 H.  
Fuel Transfer Test - Jettison Transfer Valve for the No. 3 Main Tank -Valve Open

 S 715-254
 (1)  Do these steps to open the jettison transfer valve in the No. 3 main tank.
 NOTE: The jettison transfer valve is manually opened to make sure
____ the valve body and valve shaft are installed correctly. Test one jettison transfer valve at a time.
 (a)  
Have a person go out to the rear spar area in the wheel- well for the right wing landing gear.

 (b)  
Find the jettison transfer valve actuator for the No. 3 main tank (adjacent and outboard of the aft override/jettison pump).

 (c)  
Push the manual lever on the jettison transfer valve actuator to the OPEN position.

 S 715-234
 (2)  Have the person at the refuel control panel, P42, put the MAIN 4 refuel valve switch to the OPEN position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 715-219
 (3)  
Put these override/jettison pump switches on the fuel manangement control module, M154, to the ON position:

 (a)  
OVRD 3 FWD

 (b)  
OVRD 3 AFT

 S 715-220
 (4)  
Monitor the fuel synoptic.

 (a)  
Make sure the fuel quantity for the No. 4 main tank increases.

 (b)  
Transfer a minimum of 500 lbs (300 kgs) of fuel.
　
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