(c)
P415 Power Distribution Center - Right
1) 415M32 FUEL OVRD/JTSN PUMP CTR RIGHT
2) 415A38 FUEL OVRD/JTSN PUMP AFT 2
3) 415B38 FUEL OVRD/JTSN PUMP AFT 3
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747-400 MAINTENANCE MANUAL
S 864-173
(3) Make sure the airplane is in a 0.5° (| 2°) nose down and 0.0° (| 2°) roll attitude.
NOTE: At different pitch and roll attitudes the fuel quantity that
____ is necessary to prime the pumps will change. See the pump priming graphs to find the necessary fuel quantity (Fig. 404 and 405).
E. Override/Jettison Pumps for the Inboard Main Tanks Operational Test
S 654-033
(1)
Refuel the inboard main tanks to make sure there is enough fuel to prime the pump (Fig. 404) (AMM 12-11-01/301).
S 864-167
(2)
Put the applicable pump control switch for the override/jettison pump to the ON position:
(a)
OVRD 2 FWD
(b)
OVRD 2 AFT
(c)
3 OVRD 3 FWD
(d)
OVRD 3 AFT
S 864-174
(3)
Operate the pump for 30 seconds to move fuel inside the pump to the priming impeller.
(a)
When the PRESS indication light on the pump control switch goes off, the pump is primed.
NOTE: Do not operate the pump for more than five minutes
____ during the reprime operation.
S 864-175
(4)
Listen at the pump to make sure the override/jettison pump operates (or vibrates).
S 864-176
(5)
Put the applicable pump control switch to the off position:
(a)
OVRD 2 FWD
(b)
OVRD 2 AFT
(c)
OVRD 3 FWD
(d)
OVRD 3 AFT
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A
747-400 MAINTENANCE MANUAL
S 864-177
(6) If the PRESS indication light remains on, do this procedure: Low Pressure Light On the Pump Control Switch Remains On.
NOTE: A low pressure indication for the override/jettison pump
____ can show that the pump has trapped air (the pump did not reprime).
F. Override/Jettison Pump for the Center Wing Tank Operational Test
S 654-170
(1) If you replaced the override/jettison pump(s) in the center wing tank, do one of these procedures to prime the pump(s):
NOTE: If the center wing tank fuel quantity is at or above LEVEL 1
____ (Fig. 405), then do METHOD 1 to prime the center wing tank pump(s). If the fuel quantity is below LEVEL 1, then do METHOD 2 or 3.
(a)
METHOD 1
Use fuel head pressure to prime the pump
(b)
METHOD 2 Use the pressure refuel system to operate the wetting system
(c)
METHOD 3 Transfer fuel from the inboard main tanks to operate the wetting system
S 864-209
(2) METHOD 1 - Use fuel head pressure to prime the pump
________
(a)
Make sure the fuel quantity in the center wing tank is at or above LEVEL 1 (Fig. 405). 1) If the fuel quantity is below LEVEL 1, then do METHOD 2 or
METHOD 3.
(b)
Put the applicable pump control switch for override/jettison to the ON position: 1) CTR L 2) CTR R
(c)
When the PRESS indication light on the pump control switch goes off, the pump is primed.
NOTE: Do not operate the pump for more than five minutes
____ during the reprime operation.
(d)
Listen at the pump to make sure the override/jettison pump operates (or vibrates).
(e)
Put the applicable pump control switch to the off position: 1) CTR L 2) CTR R
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