Re: Three out of four on a -747?

From:         "M.A. van der Eijk" <M.vanderEijk@LR.TUDelft.NL>
Organization: Delft University of Technology
Date:         25 Jul 95 03:06:45 
References:   1
Followups:    1
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Keith Edmunds <kae@itworks.demon.co.uk> wrote:
>On more than one occasion I've noticed three contrails from a B-747.
>Is it likely that one engine would be shut down?
>
>Keith

Yes, it is possible. It of course does not happen often, but ferry flights
(from one, smaller, airport to another, bigger, to perform maintenance on
an engine) can be flown with 3 in stead of four engines.
Another possibility is that one engine's temperature differs from the
other ones.

Michiel