(e)
Disconnect connector DV56 from the left jettison nozzle valve.
(f)
Disconnect connector DV49 from the right jettison nozzle valve.
S 865-128
(12)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
On the P6 panel:
1) 6C18, JTSN NOZZLE VLV CONT R
2) 6D18, JTSN NOZZLE VLV CONT L
F.
Fuel Jettison Simulation - Ground Test
S 735-127
(1)
Have a person go out to the refuel control panel, P42, and keep communication with the flight compartment.
S 735-126
(2)
Put the refuel valve switch for the No. 2 main tank, MAIN 2, on the P42 refuel control panel, to the OPEN position.
S 735-135
(3)
Put the FUEL JETTISON control selector switch on the fuel jettison module, (P5 pilots' overhead panel) to the A position.
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S 735-148
(4) Make sure TEMP on the top EICAS display is replaced with TO REMAIN.
S 735-206
(5) Make sure the white jettison schematic shows on the fuel synoptic.
S 735-138
(6) Put these override/jettison pump switches for the No. 3 main tank on the fuel management control module (P5 pilots' overhead panel) to the ON position: (a) 3 OVRD FWD (b) 3 OVRD AFT
S 735-139
(7) Make sure the amber PRESS indicator light in each switch comes on and then goes off, followed by a white ON indication light.
S 735-140
(8) Monitor the fuel synoptic. (a) Make sure the pump box symbols for the No. 3 main tank override/jettison pumps change color in this sequence: 1) White (pump off) 2) Amber (pump on - low pressure)
S 735-131
(9) Do these steps to prepare the left nozzle valve for the fuel jettison simulation. (a) Have a person (with a jumper cable) go out to the actuator for the left nozzle valve.
(b) Make sure the nozzle valve electrical connector, DV56 is disconnected.
(c) (d) Make sure the person is in communication with the flight compartment.Do the next two steps within seven seconds of each other to prevent a nozzle valve disagree message. 1) Put the FUEL JETTISON L-NOZZLE switch on the fuel jettison module to the open position. 2) Install a jumper between pins 2 and 3 of the jettison nozzle valve connector DV56.
S 735-132
(10)
Do these steps to prepare the right nozzle valve for the fuel jettison simulation.
(a)
Have a person (with a jumper cable) go out to the actuator for the right nozzle valve.
(b)
Make sure the nozzle valve electrical connector, DV49 is disconnected.
(c)
Make sure the person is in communication with the flight compartment.
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A
747-400
MAINTENANCE MANUAL
(d) Do the next two steps within seven seconds of each other to prevent a nozzle valve disagree message. 1) Put the FUEL JETTISON NOZZLE-R switch on the fuel jettison
module to the open position. 2) Install a jumper between pins 2 and 3 of the jettison nozzle valve connector DV49.
S 735-162
(11)
Turn the FUEL JETTISON FUEL TO REMAIN knob on the fuel jettison module until the FUEL TO REMAIN value on the top EICAS display is less than the total quantity of fuel on the airplane.
S 735-133
(12)
Monitor the fuel synoptic.
(a)
Make sure the the pump box symbols for the No. 3 main tank override/jettison pumps change color in this sequence: 1) Magenta pump box (pump on-pressure) 2) Magenta pump box flow bars (pump on - jettison flow) 3) When there is fuel flow out of the No. 3 main tank and into
the No. 2 main tank, make sure there are jettison flow bars between the symbols for the aft override/jettison pumps in the No. 3 main tank and the jettison nozzle valves.
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