Re: ETOPS Question

Date:         20 Nov 97 02:53:41 
From:         rlawler@isd.net
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Steve Lacker wrote:
> Rob Wells (WLL) wrote:
> > In Oz it was reported that the APU was definitely non-op. I seem to
> > remember that there was only enough compressed air left for one more
> > attempt to turn over an engine. But perhaps that was an embelishment
> > added by the local tabloids.
>
> I would say "embellishment." As far as I know, there is NO storage of
> compressed air on board a commercial aircraft- certainly not enough for
> engine starts. The compressed air is fed from a *running* APU straight
> to the engine starter.

One other point.  The APU cannot be operated in the air on the
B747-100/200 series...of running during takeoff, the APU on the B747-400
can be used upto approx 15-20,000 ft.  Its doubtful it can be started
in the air.