Aircraft fuel systems Flashcards
why do some aircraft have fuel jettison systems?
To allow the crew to reduce the weight of the aircraft down to or below the maximum allowable landing weight
Is there any reason why a fuel jettison system might be required on a small aircraft?
Yes, if the maximum takeoff weight exceeds the maximum allowable landing weight, a jettison system would be required.
What are some other names for a single-point fueling system?
an underwing or pressure fueling system
Why do multi-engine airplanes have cross feed systems?
to allow any engine to draw fuel from any tank
The fuel selector valve for a multi-engine aircraft must have at least three positions, What are they?
ON, OFF and cross-feed
Why do some fuel tanks have internal baffles?
To resist fuel surging or sloshing caused by changes in the attitude of the aircraft
What are the two types of fuel cells?
Integral or wet wing fuel cells, and bladder-type fuel cells
What does the term “wet-wing” mean?
It means that sealed portions of the aircraft wing structure form the fuel tank(s)
How is the weight of the fuel supported when bladder-type fuel cells are used?
The bladder is supported by the aircraft structure which contains it
Why do turbine-engine aircraft have fuel temperature indication systems?
To allow the crew to determine if the fuel is cold enough to produce a danger of the formation of ice crystals.
Name four types of fuel quantity gauging systems currently in use
Sight gauges, mechanical, electrical, and electronic gauges
why are electronic (capacitance) fuel quantity indicating systems more accurate than other types?
They measure the mass of the fuel instead of the volume
What are drip gauges and sight gauges?
Underwing, bayonet-type fuel gauges
What is the purpose of an in-transit light associated with an electrically operated fuel tank shutoff valve?
To provide an indication that the valve is in motion between one position and another.
For what reason is a fuel jettison system usually divided into two separate, independent systems, one one for each wing?
To help maintain lateral stability by jettisoning fuel from a heavy wing if necessary