Re: AA changes rules after BDL incident

From:         "G. E. Lambert" <gedl@popd.ix.netcom.com>
Organization: Netcom
Date:         21 Dec 95 03:33:11 
References:   1 2
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When in landing configuration (they were) the GPWS must sense "excessive"
rate of closure with terrain, as measured by a radio altimeter that is
looking straight down, not forward.  "Excessive rate" is a function of
radio altitude.  Obviously, the system must permit rates on the order of
700 to 1000 fpm or no landing could ever be completed without a warning.

In this incident, the rates apparently never exceeded the "excessive"
threshold.  If they had I think the outcome would have been much
different (much worse).