Auxiliary power units (APUs) do their dull and dirty work hidden away in aircraft tailcone compartments, unlike their turbine engine brethren connected to the wings or empennage. On occasion however, ...

Auxiliary power units are complex devices with a plethora of items to check and service – from oil level and mounting condition to coolant hoses and filters. However, the payoff can be huge. An idling ...

An Auxiliary Power Unit (APU) is a small turbine engine in an aircraft that serves as an additional energy source, primarily used on the ground. Its main functions include starting the aircraft's main ...