What does the acronym APU stand for in aviation?

• A. Auxiliary Power Unit
• B. Aviation Power Unit
• C. Aircraft Power Unit
• D. Aerodynamic Power Unit

Answer: (A)

The acronym APU stands for Auxiliary Power Unit in aviation. An APU is a vital component of many aircraft, providing electrical power and pneumatic pressure while the aircraft is on the ground, thereby enabling systems like air conditioning and engine start without relying on the main engines. This unit plays an essential role in ensuring comfort and safety before takeoff and after landing.

The term "auxiliary" indicates that this unit serves as a secondary power source distinct from the main engines, underscoring its supportive role rather than a primary power source. Understanding the function of the APU is crucial for those involved in aviation operations and maintenance, as it significantly contributes to the overall efficiency and functionality of the aircraft’s ground operations.