Exam (elaborations)
B-747 PC ORAL PREP - FUEL SYSTEM EXAM QUESTIONS AND ANSWERS
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B-747 PC ORAL PREP - FUEL SYSTEM EXAM QUESTIONS AND ANSWERS....
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How is fuel scavenged from the centre wing tank? ANSWER: Four jet pumpsscavenge CWT fuel by pumping it into the main tanks. Scavenge starts when
the fuel level in main tanks two or three drops to about 27,200 kg.
When adjusting T/O flaps, which cross-feed valves are managed by Fuel
System Management logic? ANSWER Two and three crossfeed valves
What centre wing tank quantity must you choose the centre wing pumps on
during the Before Start Procedure? ANSWER At least 7,700 kg in the centre
wing tank
What centre wing tank quantity must you choose the centre wing pumps on
during the LCF's Before Start Procedure? ANSWER: The centre wing tank
weighs at least 17,000 pounds.
Can the override/jettison pumps in main tanks 2 and 3 run to a standpipe level
where there are roughly ______ kg (-400), ______ (LCF), and ______ kg (-800)
of fuel left in each tank? ANSWER: 7,000 lbs (LCF) - 3,200 kg (-400)
3,450 kg (-800)
Explain the variations in the fuel quantity signal that occur when fuel jettison is
stopped. - ANSWER: The gasoline quantity indicator turns white instead of
magenta. For five seconds, the gasoline to stay quantity flashes.
In the -400/-800, how does the Centre Wing Tank scavenge fuel? ANSWER:
Four jet pumps scavenge CWT fuel by pumping it into the main tanks.
Scavenge starts when the fuel level in main tanks two or three drops to about
27,200 kg.
How does the LCF's Centre Wing Tank scavenge fuel? Fuel is pumped to main
tank 2 by the electrical CWT scavenging pump when:
-- The amount of fuel in main tanks two or three drops below 40,200 pounds;
the CWT override/jettison pump has low pressure.
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