APU stands for what?

APU stands for what?

• A. Auxiliary Power Unit
• B. Atomic Power Unit
• C. Alternate Power Unit
• D. Air Power Unit

Answer: (A)

APU stands for Auxiliary Power Unit. This is a small power source on many aircraft that provides electrical power and pneumatic bleed air when the main engines aren’t running. Having an APU allows the aircraft to run essential systems—like air conditioning, cabin lighting, and avionics—and to start the engines without needing external power or ground equipment. Once the engines are started or external power is available, the APU is typically shut down. The other options describe terms that aren’t used in aviation to refer to the APU.

APU stands for Auxiliary Power Unit. This is a small power source on many aircraft that provides electrical power and pneumatic bleed air when the main engines aren’t running. Having an APU allows the aircraft to run essential systems—like air conditioning, cabin lighting, and avionics—and to start the engines without needing external power or ground equipment. Once the engines are started or external power is available, the APU is typically shut down. The other options describe terms that aren’t used in aviation to refer to the APU.