Re: 747 "smoke" trail

Date:         04 Jun 99 00:59:34 
From:         "John Weiss" <jrweiss@seanet*NOSPAM*.com>
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The APU of a 747 is normally shut down before takeoff.  In some
circumstances it may be left on to run one of the air-conditioning packs at
low altitude, but it should not be emitting any visible smoke.  Just look at
the 747s at the gate.  Most of them probably have their APUs running, with
no visible smoke.

John R. Weiss
Seattle, WA
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