Fuel system layouts
What does the fuel system do?
stores fuel and delivers the proper amount of clean fuel at the right pressureto meet the demands of the engine.
What is a rigid tank made of
sheet metal
Why do we have a fuel dump system?
to dump fuel thus lowering the weight of the aircraft in case of an emergency
Why are cross feed systems fitted to multi engine aircraft?
to supply fuel to the engines in case of one supply system failing
What are the two types of fuel quantity indication system?
Volumetric and Mass
How does a gravity fuel system supply fuel to the engine?
Gravity-feed systems use only the force of gravity to supply fuel to the engine fuel controlmechanism. The bottom of the fuel tank must be high enough to provide adequate pressure. This typeof system is often used in high-wing General Aviation aircraft
How is a bladder tank held in place
it is snapped or clipped in place, or, in some instances, laced to the structure
Why do we have fuel drains on fuel tanks
to collect samples for fuel testing and drain water
How does the cross-feed system allow flight deck crew to correct for fuel quantity imbalance between the wing tanks.
By opening the cross-feed valve and put the boost pumps off in the fuel tank that has less fuel.
What changes the density of fuel?
Temperature
Name 5 components in a pressure feed fuel system
pump, filter, shut off valve, cross feed valve, transfer valves, Aux power unit pump, tank
What is the advantages of an integral tank
not a lot of added weight. Uses vacant space in a wing
Will the fuel dump system dump all fuel in case of an emergency
no dump valves will close at a pre-determined min fuel level
The cross feed valve is driven by what?
twin electric motors which drive a common differential gear
What are the three factors capacitance of a capacitor depends on?
Area of the plates
Distance between the plates
Dielectric constant of the material between the plates.
What type of pump is a booster pump?
centrifugal booster pumps
What is fitted to a fuel system to allow fuel to the engine in case of total boost pump failure
Suction Valves (Bypass valve)
Why are fuel systems ventilated
To prevent structural damage to the fuel tanks caused bynegative pressure or over-pressure.
Is transferring fuel from one tank to another is usually achievable in flight?
No. Transferring fuel from one tank to another is is normally done when the aircraft is on the ground
what is the float in a float type Volumetric Fuel Quantity indication system connected to?
electrical transmitter, which transforms the angular movement of thearm into a DC electrical signal
How much fuel must each pump supply
enough to run both engines in all phases of flight
what is fitted to the fuel supply system to stop fuel going to the engine in case of a fire
Fuel shut off valve
What component equalises pressure between the main fuel tanks and surge tanks in a cruise or descent attitude.
Fuel Vent Float Valve
In an Automatic Pressure Refuelling system, under what conditions will the inlet valve close
The related fuel high-level sensors become 'wet'.
The refuel/de-fuel valves switch is set to SHUT.
The fuel tank has got the set fuel load
why do some aircraft have longitudinal balance fuel systems
To operate an aircraft as economically as possible, by maintaining the CG in a range where the horizontal stabiliser is as streamlined as possible.