Fuel System Flashcards
Why do some aircraft have jettison system?
To allow the crew to reduce the weight of the aircraft down to or below 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 max 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 fuel crossfeed system?
To allow any engine to draw fuel from any tank
The fuel selector valve for a multi-engine aircraft must have at least three position, what are they?
ON, OFF, and crossfeed
Why do some fuel tanks have internal buffles?
TO resit 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 from the fuel tank(s)
How is 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 indicating 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 gauge, mechanical, electric, and electronic gauges.
why are electronic (capacitance type) fuel quantity indicating systems more accurate than other types?
They measure the mass of the fuel instead of volume
What are drip gauges and sight gauges?
Underwing, bayonet type fuel gauge
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 for each wing?
to help maintain lateral stability by jettisoning fuel from a heavy wing if necessary
what procedure should be followed regarding gaskets and seals when replacing fuel system components?
All old gaskets and seals should be replaced with new ones
Is it possible for a fuel system to develop a leak that has no visible evidence such as a stain or spot , and if so, How?
an internal component such as valve could develop a leak
How is a fuel tank checked for leaks following a patch or welded repair?
The tank is slightly pressurized with air and the repaired area is leak checked with a soap and water solution
Name some advantages of a single-point fueling systems
it reduces fueling time, reduces chances for contamination and fire, and eliminates damage to the aircraft skin
why should you wait for a period of time after fueling an aircraft before checking the fuel sumps
To allow time for water and contaminants to settle to the drain point
