A&P - Aircraft and Powerplant Aircraft Fuel Systems Flashcards
6 cards from real A&P practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 A&P - Aircraft and Powerplant Aircraft Fuel Systems flashcards as text
What grade of aviation gasoline (avgas) is identified by its blue color?
Answer: 100LL (low-lead)
100LL avgas is dyed blue for identification and is the most widely used grade for piston-powered aircraft.
What is the primary purpose of a fuel system boost pump?
Answer: Provide positive fuel pressure to the engine-driven pump and prevent vapor lock
Boost pumps supply positive inlet pressure to the engine-driven pump and prevent vapor lock, especially during takeoff and high-altitude operations.
What does a fuel selector valve set to 'BOTH' mean on a single-engine aircraft with two wing tanks?
Answer: Fuel is drawn from both tanks simultaneously through a crossfeed manifold
The BOTH position opens both tank feeds simultaneously, drawing fuel from both wing tanks at the same time.
Where is the fuel tank sump drain located and why?
Answer: At the lowest point of the tank to collect and drain water and sediment
The sump drain is at the lowest point of the fuel tank so that water, which is denser than fuel, accumulates there and can be drained during preflight.
What is the maximum allowable water contamination check procedure during aircraft preflight?
Answer: Drain a sample from each sump into a clear container and visually check for water globules or cloudiness
Preflight fuel sampling involves draining fuel into a clear tester and checking visually for water (appears as globules or cloudiness at the bottom).
What type of fuel does a turbine (jet) engine aircraft use?
Answer: Jet-A (kerosene-based)
Most commercial and turbine-powered aircraft use Jet-A, a kerosene-based fuel with a high flash point and good cold-weather properties.