Date: 12 Dec 96 03:49:24 From: Andrew Weir <100637.616@CompuServe.COM>
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On June 24 1982 a BA 747's four engines flamed out in a volcanic cloud over a period of one minute. In this case the engines were not destroyed, only stopped by the volcanic dust. In efforts to get the engines restarted the crew deliberately increased their rate of descent to try and "bump start" the engines, so they could have taken longer to descend if they had wanted to. Anyway, the engines went out at about 37,000 ft, and they finally got them all going again over a period of about two minutes, 11 minutes after the flame-out, at an altitude of 12,000 feet. They landed safely at Jakarta, but it was quite a story. There was a book on it, and accounts of it are given in Stanley Stewart's "Emergency in the cockpit" and Macarthur Job's "Air Disasters Vol 2". The crew had calculated (given weight factors and velocity at the time of the flame-out) that they could fly unpowered for 141 nautical miles at a glideslope of three degrees for 23 minutes before reaching sea level.