AME Aircraft Fuel Systems and Fire Protection

Question 1

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

Accepted Answer

To maintain positive fuel pressure, prevent vapor lock, and supply the engine-driven pump

Answer

Fuel boost pumps maintain positive pressure in the supply line to prevent vapor lock and ensure adequate fuel delivery to the engine-driven pump, especially during takeoff and climb.

Question 2

Introducing the wrong fuel type into an aircraft (e.g., Jet-A into an avgas aircraft) is specifically called:

Accepted Answer

Misfueling

Answer

Misfueling refers to the introduction of the wrong fuel type into an aircraft, which can cause engine failure and is one of the most serious maintenance errors.

Question 3

Which component in a fuel system prevents fuel from flowing backward from the engine toward the tanks?

Accepted Answer

Check valve

Answer

Check valves are one-way valves that allow fuel flow in only one direction, preventing reverse flow that could drain lines or allow unintended fuel migration between tanks.

Question 4

What does the designation 'AVGAS 100LL' mean?

Accepted Answer

Aviation gasoline with 100 octane rating and low lead content

Answer

AVGAS 100LL stands for aviation gasoline with a 100 octane rating and 'low lead' formulation, containing less tetraethyl lead than the older 100/130 grade.

Question 5

How is a fuel system water contamination check typically performed?

Accepted Answer

Draining fuel from sumps into a clear container and visually checking for water separation

Answer

Water in fuel separates due to its higher density and appears as a distinct layer or globules at the bottom of a clear fuel sample drained from the lowest tank sump point.

AME - Aircraft Maintenance Engineer Practice Test

AME - Aircraft Maintenance Engineer Practice Test

AME Aircraft Fuel Systems and Fire Protection