Airframe Mechanic Certification Aircraft Fuel Systems

Question 1

What type of fuel is used in most modern turbine-powered aircraft operating in the United States?

Accepted Answer

Jet-A

Answer

Aviation gasoline (avgas) 100LL

Answer

JP-4

Answer

Mogas

Question 2

What is the primary purpose of a fuel boost pump in an aircraft fuel system?

Accepted Answer

To provide positive fuel pressure and prevent vapor lock

Answer

To filter contaminants from the fuel

Answer

To measure fuel quantity in the tank

Answer

To transfer fuel between wing tanks

Question 3

What color dye is used to identify 100LL aviation gasoline (avgas)?

Accepted Answer

Blue

Answer

Red

Answer

Green

Answer

Purple

Question 4

What is the function of a fuel strainer (gascolator) installed in an aircraft fuel system?

Accepted Answer

To remove water and debris from fuel before it reaches the engine

Answer

To boost fuel pressure to the carburetor

Answer

To measure fuel flow rate to the engine

Answer

To control the fuel-to-air mixture ratio

Question 5

What fuel tank venting requirement must be met to prevent structural damage to the tank?

Accepted Answer

Vent openings must be protected against ice blockage

Answer

Vents must be located only on the top surface of fuel tanks

Answer

All vents must incorporate check valves

Answer

Vents must allow airflow in one direction only

Question 6

What does the term 'unusable fuel' mean in the context of an aircraft fuel system?

Accepted Answer

Fuel that cannot be safely used in flight due to system design limitations

Answer

Fuel that has been contaminated and cannot be used safely

Answer

Aviation fuel that has exceeded its storage shelf life

Answer

Fuel remaining in lines after the engine is shut down

Question 7

What fuel selector valve position is recommended during takeoff and landing on most aircraft with multiple fuel tanks?

Accepted Answer

Both tanks or the fullest tank

Answer

Off

Answer

Left tank only

Answer

Right tank only