Aircraft Fuel Systems Flashcards
7 cards from real Airframe Mechanic Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Aircraft Fuel Systems flashcards as text
What material is commonly used for flexible fuel hose connections in certified aircraft fuel systems?
Answer: Teflon-lined synthetic rubber hose
Teflon-lined synthetic rubber hoses are used for flexible fuel connections because Teflon resists aviation fuel degradation and the rubber provides flexibility to absorb vibration.
Where should a fuel tank sump drain be located to be most effective?
Answer: At the lowest point where water and sediment accumulate
Sump drains are at the lowest point so water, which is denser than fuel, and sediment collect there and can be drained during preflight inspection.
What is the purpose of a fuel cross-feed system on a multi-engine aircraft?
Answer: To allow fuel flow from one wing tank to the other or to feed any engine from any tank
A cross-feed system allows fuel to be transferred between tanks for lateral balance or to supply any engine from the opposite wing tank in the event of a fuel pump failure.
Under what conditions may automotive gasoline (mogas) be used in a certificated aircraft?
Answer: Only when the aircraft has an STC specifically approving its use
Automotive gasoline may only be used in certificated aircraft when a Supplemental Type Certificate (STC) has been issued specifically approving mogas for that aircraft and engine combination.
What is the maximum allowable fuel tank leakage per FAA standards?
Answer: Seepage (wetness without drops forming) is acceptable; dripping is not
FAA standards distinguish between 'seepage' (fuel wetness with no drops) which is acceptable, and 'leakage' where drops form, which is not airworthy.
What is the purpose of fuel tank baffles installed inside aircraft fuel tanks?
Answer: To prevent fuel surge and maintain fuel outlet coverage during flight maneuvers
Fuel tank baffles are internal partitions that prevent fuel from surging away from the outlet during maneuvers, ensuring continuous uninterrupted fuel flow to the engine.
What type of fuel system is used on most high-wing general aviation aircraft with gravity-fed carburetor engines?
Answer: Gravity-feed system relying on fuel head pressure from the tanks
High-wing aircraft with carbureted engines often use a gravity-feed system where fuel flows by gravity from the wing tanks above the engine without requiring a pump.