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B-747 Oral Question Bank & Review: Fuel System with Complete Solutions
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B-747 Oral Question Bank & Review: Fuel System with Complete Solutions
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B-747 Oral Question Bank & Review:Fuel System with Complete Solutions
Describe how the fuel quantity indication changes upon termination of fuel jettison: -
ANSWER-- The fuel to remain quantity indication changes from magenta to white.
- The fuel to remain quantity flashes for 5 seconds.
During fuel jettison on the LCF, transfer valves open when fuel quantity in thanks 2 or 3
decrease to _____ pounds? - ANSWER-20,000 pounds
During the Before Start Procedure, at what center wing tank quantity are you required to
select the center wing pumps on?
Quantity in lbs for the LCF? - ANSWER-- 7,700 kgs or more in center wing tank
- 17,000 lbs or more in center wing tank
How does Center Wing Tank Fuel scavenge in the LCF? - ANSWER-CWT electric
pump into main tank 2 when:
- CWT override/jettison pump has low pressure
- Fuel quantity in main tank 2 OR 3 tank is below 40,200 lbs
(Pump will operate for approximately two hours or until scavenge pump pressure is low,
whichever is first)
How is Center Wing Tank Fuel scavenged in 400/-8? - ANSWER-CWT fuel is
scavenged by 4 jet pumps pumping into main tanks 2 and 3
- Scavenge begins when main tank 2 or 3 fuel quantity decreases to approximately
27,200 kgs
In general, how would you handle an excessive fuel imbalance situation? - ANSWER-
By opening or closing crossfeed valves and turning off and on fuel pump switches
(refer to QRH and Supplementary Procedures)
In which tank is fuel temperature measured? - ANSWER-Main tank 1
Main tank 2 and 3 override/jettison pumps can operate to a standpipe level of
approximately _____ kgs (400), _____ lbs (LCF) and _____ kgs (-8) of fuel remaining in
each tank? - ANSWER-- 3,200 kgs
- 7000 lbs
- 3450 kgs
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