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OP Fuel Systems.

QuestionAnswer
Why do some aircraft have fuel jettison systems? To allow the crew to reduce the weight of the aircraft down to or below maximum landing weight.
Is there any reason a fuel jettison system might be required on small aircraft? Yes if the maximum takeoff weight exceeds the maximum allowable landing weight a fuel jettison system would be required.
What are some other names for a single point fueling system? Underwing or pressure fueling system.
Why do multi engine aircraft have fuel cross feed systems? To allow any engine to draw from any tank.
The fuel selector valve for multi engine aircraft must have at least three positions, what are they? On, OFF, CROSSFEED.
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 (wet wing), or Bladder type.
What does the term wet wing mean? It means that sealed portions of the aircraft wing structure form the tanks.
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 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 gauges, mechanical, electric and electronic.
Why are electronic (capacitance type) 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 shut off 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 procedures should be followed regarding gaskets and seals when replacing fuel system components? All old gasket and seals should be replaced with new ones.
Is it possible for a fuel system to develop a leak that has no visible signs such as a stain or spot, and if so, how? An internal component such as a valve could develop a link.
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 system? 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.
What are two reasons Prist is added to the fuel that is used in a turbojet aircraft? Prist (fuel system icing inhibiter) used to prevent microbial growth and ice formations in jet fuel.
Where are 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.
What are three uses of a centrifugal booster pump that is installed in an aircraft fuel tank? Booster pumps are used to produce fuel pressure for starting the engine, to keep the fuel from vapor locking at high altitude, and to transfer fuel from one tank to another.
What is meant by a compensated engine-driven fuel pump? An engine-driven fuel pump whose pressure relief valve is affected by pressure of the atmosphere. the pump varies its outlet fuel pressure so it will stay a constant amount higher than the pressure of the air that is entering the carburetor.
Why do engine-driven fuel pumps have a bypass valve in them? The bypass valve allows fuel from the booster pump to flow around the engine-driven pump mechanism for starting the engine and to supply the engine with fuel if the engine-driven pump should fail.
Why must an aircraft fuel valve have a detent in its operating mechanism? The detent gives the pilot a positive indication by feel when the selector valve is in the full ON and full OFF position.
What characteristic of the fuel is measured with the mass-flow fuel flowmeter that is used with turbine engine aircraft? The density of the fuel.
What is used as a flowmeter for a fuel-injected, horizontally opposed aircraft engine? A pressure gage that measures the pressure drop across the injector nozzles in the engine.
What safety precautions must be taken before a person enters the fuel cell of a large aircraft? The cell must be thoroughly purged of all fumes, the person entering the cell must wear proper safety equipment, and there must be a person standing by on the outside of the cell.
What gas is used to purge a fuel tank of all fuel vapors? Carbon dioxide or nitrogen.
How is a fuel leak indicated on a reciprocating-engine-powered aircraft? The dye that is in the gasoline stains the area around the leak.
What is the purpose of a drip gage in the fuel tank of a large aircraft? The drip gage allows a mechanic to check the fuel level in a tank from the bottom of the tank.
What safety precautions should be taken before an aircraft is defueled? Be sure that the fuel truck is properly located, the truck and the aircraft are electrically grounded, all electrical power except that needed for the defueling operation is turned off, and the fuel is returned to the proper truck or other container.
What markings must appear near the filler opening of the fuel tanks on reciprocating-engine-powered aircraft, the word FUEL and the minimum grade of fuel.
What markings must appear near the filler opening of the fuel tanks on turbine-powered aircraft? the word FUEL, the permissible fuel designations, the maximum permissible fueling supply pressure, and the maximum permissible defueling pressure.
Created by: g153511
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