Re: TWA Flight 800 accident

Date:         04 Dec 96 02:42:19 
From: (RD Rick)
Organization: Netcom
References:   1 2
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In <airliners.1996.2657@ohare.Chicago.COM> writes:
>I have suggested to the NTSB that they investigate the nose down pitch
>stops on both vertical gyros to assess any excessive impact damage. In
>investigation of the Northwest Boeing 720B upset accident near Miami,
>referred to in an previous letter, there was severe damage to the
>nose-down pitch stops as a result of a rapid rotation of the aircraft
>about its pitch axis. Incidentially this pitch-up phenomenon is not
>accompanied by any increase in aircraft load factor and thus is not
>recorded on the flight data recorder! Any pilots reaction to this
>instantaneous transition is immediate. The crew on the Northwest
>...I've not heard from
>the NTSB about the suggested inspection of the vertical gyros!  I have
>been writing letters to most of the government and private aircraft
>safety organizations over the past 30 years since I experienced a
>pitch-up in a Boeing 707 in 1965 in visual conditions, trying to alert
>the industry to this problem. I am hoping that the internet will be
>the solution to getting information out to the public.

Very few 747's are flying wiht vertical gyros.  Most of them have Arinc
561 style INS for both attitude and navigation.  Not sure your concerns
apply to INS.