Re: ETOPS Question

Date:         22 Nov 97 20:41:27 
From:         jf mezei <"[non-spam]jfmezei">
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re: APUs that don't work at altitude.

I am curious as what is done differently on an APU used on ETOPS planes
(which can operate anytime anywhere) and APUs that won't work at

Is it a question of the cold temperature or the lower pressure at
altitude ?

In either case, what is done on an ETOPs rated APU to counter this
problem/difficulty ?