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

Jet-A is the standard turbine fuel used in commercial and general aviation jet aircraft in the US due to its consistent flash point and energy content.

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

Fuel boost pumps supply positive pressure to the engine-driven fuel pump inlet, preventing vapor lock and ensuring reliable fuel flow especially at high altitudes.

Question 3

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

Accepted Answer

Blue

Answer

100LL (low lead) avgas is dyed blue so it can be visually distinguished from other fuels, preventing misfueling during servicing.

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

A fuel strainer or gascolator filters out water, sediment, and particulate contaminants to protect the carburetor and engine from damage.

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

FAA regulations require fuel tank vents to be protected against icing so tanks can breathe freely, preventing dangerous pressure differentials that could damage the tank structure.

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Aircraft Fuel Systems