Explaining APU (Auxiliary Power Unit) on Airplanes

APU is the smallest engine on airplanes. APU is necessary to start up the main engines, it also powers the airplane's electronics.

Please *LIKE* and *SUBSCRIBE*

[davidplatt]

Right, but engines don't produce lift, wings produce lift. Engines just provide the power required to allow the wings to create lift.

Do these units keep the plane flying if the main engines fail?

[krtedu]

If apu is turn off during take off, what thing provide electric power to air 🤔