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A
747-400 MAINTENANCE MANUAL
S 715-191
(4)
Monitor the fuel synoptic.
(a)
Make sure the fuel quantity for the No. 4 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.
S 715-218
(5)
If the fuel quantity in the No. 4 main tank increases, the right jettison transfer valve for the center wing tank is in the open position.
S 715-217
(6)
Close these switches on the fuel management control module, M154:
(a)
OVRD 3 FWD
(b)
OVRD 3 AFT
S 715-194
(7)
Have the person at the refuel control panel, P42, put the MAIN 4 refuel valve switch to the CLOSED position.
S 715-195
(8)
Put the manual lever on the jettison transfer valve to the CLOSED position.
K.
Put the Airplane Back to the Usual Condition
S 655-219
(1)
Transfer fuel if it is necessary to balance the fuel tanks
(AMM 28-26-00/201).
(2)
Close the access door for the refuel control panel, 521CB.
S 415-208
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747-400 MAINTENANCE MANUAL
S 095-210
WARNING: REFER TO AMM 27-81-00/201 FOR THE LOCK REMOVAL PROCEDURE.
_______ FLAPS WILL RETRACT IN 7 SECONDS AND CAN CAUSE INJURY TO PERSONS OR EQUIPMENT.
(3) Remove all of the safety locks from the leading edge flaps (AMM 27-81-00/201).
S 095-211
WARNING:_______DO THE PROCEDURE IN AMM 32-00-30/201 TO REMOVE THE LOCKS. THE DOORS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(4)
Remove the wing and body gear door locks (AMM 32-00-30/201).
S 865-253
(5)
Close these circuit breakers and remove the DO-NOT-CLOSE tags:
(a)
On the main power distribution panel, P6: 1) 6C18, JTSN NOZZLE VLV CONT R 2) 6D18, JTSN NOZZLE VLV CONT L
S 865-197
(6) Remove the electrical power, if it is not necessary for other tasks (AMM 24-22-00/201).
TASK 28-31-00-735-152
8. Fuel Jettison Simulation - Ground Test______________________________________
A. General
(1)
The fuel jettison simulation ground test does an operational test of the fuel jettison system display on the fuel synoptic.
(2)
To get a jettison flow display on the fuel synoptic, jettison mode must be active. Jettison mode is active when:
(a)
The jettison control selector switch is in the A or B position
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747-400 MAINTENANCE MANUAL
(b)
The left or right fuel jettison nozzle valve(s) are open
(c)
The fuel to remain fuel quantity is less than the total fuel quantity.
(3)
It is important that the jettison nozzles valves remain closed during this procedure. This procedure removes power to the jettison nozzle valves and provides a nozzle valve open signal to the valve position logic cards to simulate an open jettison nozzle valve. If the nozzle valves are actually open, fuel pressurized by the jettison pumps can flow out of the wing tips at the jettison nozzles.
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