From: firstname.lastname@example.org (Mark Brader) Organization: SoftQuad Inc., Toronto, Canada Date: 08 Aug 95 02:18:27 References: 1 2
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Karl Swartz (kls@ohare.Chicago.COM) writes: > (The China Air 747SP which went into a dive over the Pacific > on February 19, 1985, after flaming out all four engines, is often > speculated to have gone supersonic, but the accident report concludes > that the aircraft probably stayed subsonic.) In "The Final Call: Why Airline Disasters Continue to Happen", (Pantheon, 1990, ISBN 0-679-40174-1), author Stephen Barlay spends several pages on that incident. He says that while the crew *thought* they had suffered a quadruple flameout, the NTSB investigation came to quite a different conclusion. The incident occurred near the end of a nonstop flight from Taipei to San Francisco. It began with a bit of clear air turbulence, causing the airspeed to fluctuate. At some point the autopilot "decided" to increase engine power to maintain speed, but #4 engine did not respond. The flight engineer soon decided that it had flamed out, but according to Barlay paraphrasing the NTSB, it actually "was in a hung condition due to the way it had been operated". Now the real mistake: the pilot did not turn off the autopilot. According to an account I remember from somewhere else, its priority was to maintain altitude, but the plane's altitude of 41,000 feet was higher than its ceiling for flight on 3 engines. In any case, the airspeed dropped to the point where the pilot feared a stall, and he responded by putting the nose down *via the autopilot controls*. The autopilot was now way outside its operating parameters, and the plane went out of control, rolling inverted and then diving, with heavy G-forces, into clouds. The crew became disoriented and did not realize just what was happening. The flight engineer reported flameouts on the other three engines, but (according to the NTSB according to Barlay) he was again wrong about that. The ground came into view at 11,000 feet, and the pilot was than able to correct its attitude and pull out of the dive. An engine restart was performed, apparently successfully (well, the engines were working after it) and the flight proceeded to San Francisco. -- Mark Brader \"The age of chivalry is gone. That of sophisters, econ- email@example.com \ omists, and calculators, has succeeded; and the glory SoftQuad Inc., Toronto \ of Europe is extinguished for ever." -- Burke, 1792 This article is in the public domain.