Re: B747 technical questions

Date:         01 Aug 97 04:04:17 
From: (C. Marin Faure)
Organization: Northwest Nexus Inc.
References:   1 2
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In article <airliners.1997.1564@ohare.Chicago.COM>,
(JWizardC) wrote:

> >For the 5th engine which can be installed on the pod under the wings
> To my knowledge, the only time a fifth engine has been added to the B-747
> is during testing of new engine designs; a la B777. In this case, the
> fifth engine can be and is used during flight.

This is not really correct.  We have used 747s to test engines for the 767
and 777, but the test engine is simply put in place of the 747's number
two or three engine.  The airplane is not stressed, plumbed, or wired for
an operational fifth pylon and engine.

C. Marin Faure
  author, Flying A Floatplane