Date: 29 Aug 97 08:10:42 From: email@example.com (McLELLAN Alexander, DED/1) References: 1 2 3 4 5
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The ICAO Journal, March 1997 is devoted to Safety Near terrain. Here are some data on GPWS activation, from a table in one of the articles. Data were supplied by BA, and cover Sept 1991 to Sept. 1992. The article was written by a BA training Captain, John Savage. Number of warnings: 301 Number of times crew responded with go-around: 121 (40%) Number of genuine warnings: 39 (13% of total warnings) Number of times a genuine warning resulted in a go-around: 31 (81%rate of response) At that time the BA rule was "In the event of a GPWS pull-up warning, action must be taken immediately and simultaneously to rotate the aircraft and apply go-around thrust" So, in what is acknowledged to be one of the worlds safest airlines, about 1 in 5 genuine GPWS warnings were ignored, despite strict, unequivocal instructions not to ignore ANY GPWS warnings. It is to BA's credit that their safety system is capable of identifying these problems, analysing them, and taking corrective action. The rules have now changed to those quoted by Vance Burton. Regards Alex. This message does not constitute official EUROCONTROL correspondence. The Organisation is not responsible for its contents or the consequences of its use, nor for inaccurate transmission or misdirection.