(b)
No. 2 main tank OVRD/JETT aft pump
(c)
No. 2 main tank OVRD/JETT forward pump
(d)
No. 3 main tank OVRD/JETT aft pump
(e)
No. 3 main tank OVRD/JETT forward pump
S 715-119
(6)
Do these steps to test the control function of the fuel system management control cards (FSMC) on the override/jettison pumps.
(a)
Put these center wing tank override/jettison pump switches to the ON position: 1) CTR L 2) CTR R
(b)
Make sure the white ON indication light in each switch comes on.
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(c)
(d)
(e)
(f)
(g)
(h)
A
747-400 MAINTENANCE MANUAL
Monitor the fuel synoptic.
1) Make sure the pump box symbols for the center wing tank override/jettison pumps change color in this sequence: a) White (pump off) b) Amber (pump on - low pressure) (momentarily) c) Green (pump on - pressure)
Put these override/jettison pump switches for the No. 2 and No. 3 main tanks to the ON position: 1) OVRD 2 FWD 2) OVRD 2 AFT 3) OVRD 3 FWD 4) OVRD 3 AFTMake sure the white ON indication light in each switch comes on.Monitor the fuel synoptic. 1) Make sure the pump box symbols for the override/jettison
pumps for the No. 2 and No. 3 main tanks change color in
this sequence:
a) White (pump off)
b) Cyan (pump armed or standby)
2) Put these override/jettison pump switches to the off position (the white ON indication light in each switch does not show): a) CTR L b) CTR R
Monitor the fuel synoptic.
1) Make sure the pump box symbols for the override/jettison pumps in the center wing tank change color in this sequence: a) Green (pump on - pressure) b) Amber (pump on - low pressure) (does not always show) c) White (pump off)
2) Make sure the pump box symbols for the override/jettison pumps for the No. 2 and No. 3 main tanks change color in this sequence: a) Cyan (armed or standby) b) Amber (pump on - low pressure) (does not always show) c) Green (pump on - pressure)
Put these override/jettison pump switches to the off position (white ON indication light in the switch does not show): 1) OVRD 2 FWD 2) OVRD 2 AFT 3) OVRD 3 FWD
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A
747-400 MAINTENANCE MANUAL
4) OVRD 3 AFT
(i)
Monitor the fuel synoptic.
1) Make sure the pump box symbols for the override/jettison pumps for the No. 2 and No. 3 main tanks change color in this sequence: a) Green (pump on - pressure) b) Amber (pump on - low pressure) (does not always show) c) White (pump off)
(j)
After approximately 15 seconds, look at the main and auxiliary EICAS displays. 1) Make sure these EICAS message show:
a) FUEL OVRD CTR L (advisory) b) FUEL OVRD CTR R (advisory) c) FUEL OVRD 2 AFT (advisory) d) FUEL OVRD 2 FWD (advisory) e) FUEL OVRD 3 AFT (advisory) f) FUEL OVRD 3 FWD (advisory)
2) Make sure these EICAS message do not show: a) FUEL OVRD CTR L (status) b) FUEL OVRD CTR R (status) c) FUEL OVRD 2 AFT (status) d) FUEL OVRD 2 FWD (status) e) FUEL OVRD 3 AFT (status) f) FUEL OVRD 3 FWD (status)
H. Put the Airplane Back to Its Usual Condition
S 095-102
(1)
Remove the tail support equipment, if it is not necessary (AMM 07-11-08/201).
(2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 865-105
TASK 28-22-00-705-108
4. Engine Spar Valve Operational Test__________________________________
A. General
(1) This task does a test of the engine fuel shutoff valve (spar valve) indication and operation.
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本文链接地址：747-400 AMM 飞机维护手册 燃油 FUEL 2(84)
