Re: Cabin Noise on UA 777

From:         Colin Povey <cpovey@delphi.com>
Organization: Delphi (info@delphi.com email, 800-695-4005 voice)
Date:         10 Jul 95 16:36:59 
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"Jan P. Andrews" <jandrews@npr.org> writes:

>My colleague commented that the 777's cabin was interesting, the seats
>comfortable and the mini video screen entertaining.  He was made very
>uncomfortable, however, by what he said was a loud approx. 7.5-KHz
>acoustic "whine" that he believed originated in the ventilation system.
>
>Does anyone familiar with this craft (or at least UA's configuration of
>it) have any thoughts or comments on this?

Boeing had several problems with some ventilation ducts in the 777.  One came
loose during a flight with the Secretary of Transportation on board, requiring
a reduction in crusing altitude.  Sounds like they still have some work to do
in this area.