Originally Posted by
krismiler
I was informed by an engineer that the HP air cart could run the packs in the absence of APU bleed air but it would soon over heat and there is the issue of contamination as external HP air is meant for engine starting not breathing.
Depends on the unit, some are designed to run packs. I have done it many times in the Middle East.
interesting tidbit, some airports in the US had ground HP air that was reticulated like ground power.