Aircraft Fuel Systems Flashcards
Where can you find the correct part number for the fuel quantity sensor to be installed in an aircraft fuel tank?
In the illustrated parts catalog (IPC) for the aircraft
Where are the fuel system strainers located?
One strainer is located in the outlet to the tank, and the main strainer is located in the fuel line between the outlet of the fuel tank and the inlet to the fuel metering device
Why do the fuel strainers used on some turbine-engine aircraft have a warning device that signals the flight crew when the strainer is beginning to clog up?
Strainers clog because ice forms on the filter element. The flight crew can route the fuel through a fuel heater to melt the ice
How does water appear in the fuel drained from the tank sumps?
Water appears as a clear globule in the bottom of the container used to collect the fuel drained from the sumps
Why must an aircraft fuel valve have a detent in its operating mechanism?
The detent gives the pilot positive indication by feel when the selector valve is in the full ON and OFF position
What must be done before a fuel selector valve can be removed from an aircraft?
The tank to which the valve is connected must be drained or otherwise isolated.
What must be done after a fuel valve is replaced?
The fuel system must be checked for leaks
Why are fuel tanks divided into compartments or have baffles installed in them?
The compartments or baffles keep the fuel from surging back and forth as the aircraft changes its attitude in flight
How is a fuel leak indicated on a reciprocating-engine-powered aircraft?
The dye in the gasoline stains the area around the leak
What is the function of the sump in a fuel tank?
The sump, or lowest point, in a fuel tank is located below the fuel outlet. The sump collects water and contaminants and will have a drain to remove them
What are the three different types of fuel tanks?
- Built-up tanks
- Integral tanks
- Bladder tanks
What problem can occur in a bladder tank with a blocked vent?
As internal tank pressure decreases, the pressure differential between the atmosphere and the tank can cause the tank restraints to fail and
The tank can collapse and block the fuel outlet
How do you prepare an aluminum fuel tank for welding?
Remove all fuel and thoroughly wash the tank, inside and out, with hot water and detergent. The tank should be purged with live steam for at least 30 minutes to remove all residual fuel and vapors
After welding an aluminum fuel tank, to what pressure should the tank be tested?
3.5 psi
What are some other names for a single-point fueling system?
An under-wing or pressure fueling system
