Strange noise on a 767

From:         David Schaefer <daschaefer@delphi.com>
Date:         18 Sep 95 12:06:47 
Organization: Delphi (info@delphi.com email, 800-695-4005 voice)
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The thread on engine noises reminded me of a flight I took several years
ago...SFO to STL on a 767 (model unknown).  During boarding, I hear a
strange, loud motor noise start/stop several times.

The sound returned as the plane circled over STL and continued until
landing.  I've often wondered what it might be, and haven't heard it on
any other flight.  It seemed to emanate from below the wing....