It wasn't long ago when it seemed that APUs were found only on larger jets. For smaller corporate aircraft, which could rely on batteries or ground units for starting and main engines for cooling, APUs were an option that many operators simply didn't need. Besides, operating to and from airports with full-service FBOs meant that a GPU would always be available if needed. But times have changed. Especially as corporate aircraft and fractionals expand operations to out-of-the way locations ...

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