Morgans wrote:
"Bucky" wrote

What powers an APU? diesel fuel or something?

It is just a small jet engine, running a shaft for auxiliary power use, and
power generation. I can't imagine why an additional dedicated APU would be
necessary for the electric taxi motor.
--
Jim in NC

Most APU's are already loaded up to nearly their max output. I have yet
to be on a jet with an APU that provide enough electrical power for
everything on the aircraft as well as enough air for the air
conditioner packs.