What does the acronym APU stand for?

What does the acronym APU stand for?

• A. Attendant Power Unit
• B. Auxiliary Power Unit
• C. Aircraft Power Unit
• D. Auxiliary Power System

Answer: (B)

An APU is a small turbine engine located in the tail that provides electrical power and bleed air when the main engines aren’t running or during ground operations. This lets the aircraft’s lights, avionics, air conditioning, and starting systems operate without starting the main engines. The acronym stands for Auxiliary Power Unit. The other terms don’t match standard airline terminology—Attendant Power Unit isn’t used, Aircraft Power Unit isn’t a recognized name, and Auxiliary Power System refers to a broader system rather than the specific unit.

An APU is a small turbine engine located in the tail that provides electrical power and bleed air when the main engines aren’t running or during ground operations. This lets the aircraft’s lights, avionics, air conditioning, and starting systems operate without starting the main engines. The acronym stands for Auxiliary Power Unit. The other terms don’t match standard airline terminology—Attendant Power Unit isn’t used, Aircraft Power Unit isn’t a recognized name, and Auxiliary Power System refers to a broader system rather than the specific unit.