When flying, you don’t want to encounter a failed engine. In addition to compromising the flight, knowing that an engine could fail at any time can be very disconcerting, which is why auxiliary power units, or APUs, are crucial aircraft parts. Here is a little more information about these components. 

What Are They? 

Auxiliary power units act as a second source of power for an aircraft. They are a small jet engine typically built into the tail cone, although some are in the engine nacelle or wheel well.

These engines can be started by using the airplane’s battery and give the aircraft the chance to use power without relying on any exterior source. 

What Are Their Benefits? 

APUs are important aircraft parts because they provide redundancy to the existing engines. These powerful electric generators can be used during flights if any of the other power supplies experience a problem.

Additionally, APUs can provide an essential source of compressed air for the cabin, protecting the airframe. They also allow twin-engine jets to fly over the ocean since they can help to protect the plane’s power source. 

Also, the auxiliary power unit gives the aircraft the chance to provide power to the cabin before takeoff and after landing. The system can turn on to trigger the air conditioning and heating and to start the main engines. 

What Are Some Crucial Maintenance Tips?

Maintaining the APU is vital for the health and safety of your aircraft. The connectors should be cleaned and inspected regularly for damage or debris, and the components should be replaced when necessary.

Over time, the APU connectors can be damaged due to engine sludge, which could seize the components and result in power loss, connectivity problems, or auto-shutdown. Use a chemical motor sludge remover and a soft-bristled brush to clean the connectors and improve electrical connectivity. Then, torque and tape the component to ensure proper function. 

Never put off maintenance or repairs and be mindful that oil-wetted components may wear out faster than other parts. Fuel pumps and starters are especially prone to sludge damage, so keep an eye on these components.  

Be careful when applying oil to components and keep it away from the sensors. Stay up to date on the latest APU care guidelines to protect yourself.

If you own a plane, and you suspect that you need aircraft parts, turn to AVMATS in O’Fallon, MO, for help. Since their inception in 1978, this trusted, family-owned aircraft parts supplier has been helping people to maintain, repair, and overhaul their systems to create safer, more reliable planes. Learn more about how they can help with aircraft parts by visiting their website or give their office a call at (636) 812-3224.