(a)
3 OVRD FWD
(b)
3 OVRD AFT
S 735-128
(14)
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) Magenta pump box (pump on - pressure) 2) Amber (pump on - low pressure) (momentarily) 3) White (pump off)
(b)
Make sure the magenta jettison flow bars do not show between the symbols for the aft override/jettison pump in the No. 3 main tank and the jettison nozzles.
S 735-142
(15)
Set the refuel valve switch for the No. 2 main tank, MAIN 2, (P42 panel) to the CLOSED position.
S 735-143
(16)
Set the refuel valve switch for the No. 3 main tank, MAIN 3, (P42 panel) to the OPEN position.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-31-00
ALL ú ú 11 Page 548 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 735-144
(17)
Put these override/jettison pump switches for the No. 2 main tank on the fuel management control modules to the ON position:
(a)
OVRD 2 FWD
(b)
OVRD 2 AFT
S 735-145
(18)
Make sure the amber PRESS indicator light in each switch comes on and then goes off, followed by a white ON indication light.
S 735-146
(19)
Monitor the fuel synoptic.
(a)
Make sure the pump box symbols for the No. 2 main tank override/jettison pumps change color in this sequence: 1) White (pump off) 2) Amber (pump on - low pressure) (momentarily) 3) Magenta pump box (pump on - pressure) 4) Magenta pump box flow bars (pump on - jettison flow)
(b)
When there is fuel flow out of the No. 2 main tank and into the No. 3 main tank, make sure there are jettison flow bars between the symbols for the aft override/jettison pump and the jettison nozzle valves.
S 735-129
(20)
Put these override/jettison pump switches for the No. 2 main tank to the off position (the white ON indication light in each switch does not show):
(a)
OVRD 2 FWD
(b)
OVRD 2 AFT
S 735-130
(21)
Monitor the fuel synoptic.
(a)
Make sure the pump box symbols for the No. 2 main tank override/jettison pumps change color in this sequence: 1) Magenta pump box (pump on - pressure) 2) Amber (pump on - low pressure) (momentarily) 3) White (pump off)
(b)
Make sure the magenta jettison flow bars do not show between the symbols for the aft override/jettison pump in the No. 2 main tank and the jettison nozzles.
S 735-156
(22)
Put the refuel valve switch for the No. 2 main tank, MAIN 2, (P42 panel) to the OPEN position.
S 735-149
(23)
Put these override/jettison pump switches for the center wing tank on the fuel management control modules to the ON position:
(a)
L CTR
(b)
CTR R
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-31-00
ALL ú ú 10 Page 549 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 735-150
(24)
Make sure the amber PRESS indication light in each switch comes on and then goes off, followed by a white ON indicator light.
S 735-151
(25)
Monitor the fuel synoptic.
(a)
Make sure the pump box symbols for the center wing tank override/jettison pumps change color in this sequence: 1) White (pump off) 2) Amber (pump on - low pressure) (momentarily) 3) Magenta pump box (pump on - pressure) 4) Magenta pump box flow bars (pump on - jettison flow)
(b)
When there is fuel flow out of the center wing tank and into the No. 2 and 3 main tanks, make sure there are jettison flow bars between the symbols for the two override/jettison pumps in the center wing tank and the jettison nozzle valves.
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