A&P Aircraft Fuel Systems

Question 1

What color is 100LL aviation gasoline?

Accepted Answer

Blue

Answer

100LL avgas is dyed blue to distinguish it from other aviation fuel grades and prevent misfueling.

Question 2

What type of pump is typically used as the electric boost pump in an aircraft fuel system?

Accepted Answer

Centrifugal pump

Answer

Electric boost pumps are typically centrifugal type, providing low-pressure fuel flow to assist the engine-driven pump during start and as a backup.

Question 3

What is an integral fuel tank?

Accepted Answer

A portion of the aircraft structure that has been sealed to contain fuel

Answer

Integral fuel tanks are created by sealing a section of the aircraft's existing structure, such as a wing bay, so that the structure itself serves as the fuel container.

Question 4

What is the primary purpose of a fuel strainer (gascolator) in an aircraft fuel system?

Accepted Answer

To remove water and sediment from the fuel

Answer

The fuel strainer (gascolator) filters out water and sediment from the fuel to prevent contaminants from reaching the carburetor or fuel injectors and causing engine problems.

Question 5

Jet-A turbine engine fuel appears what color in its natural state?

Accepted Answer

Clear to straw-colored

Answer

Jet-A fuel is not dyed and appears as a clear to straw-colored liquid, unlike aviation gasoline which is color-coded by grade.

A&P - Certified Airframe and Powerplant Mechanics Practice Test

A&P - Certified Airframe and Powerplant Mechanics Practice Test

A&P Aircraft Fuel Systems