From: firstname.lastname@example.org (C. Emory Tate) Organization: BDM Federal, Inc. Date: 14 Oct 94 02:23:34 References: 1 2 3
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Not long ago, PBS repeated a NOVA segment about NTSB air accident investigations, featuring Deepak and all the crew, and centering on an investigation of a B737 crash in Panama. Seems that an HSI failure owing to a wiring fault went undetected by the crew, at night with no stars over the boonies. When the pilot rolled out of a turn, the HSI stuck, indicating that the a/c wasn't rolling out on the new heading, so the pilot kept applying opposite yoke. He did such a great job that nobody noticed that they had rolled right 'round the other way... until the HSI unstuck, and they repeated the process in the other direction... several times, in fact, until the plane finally rolled on its back and fell from the sky. Its final flight path was remarkably similar to that of US427 (apparent Dutch rolls into an inverted stall and powered dive), but that's gotta be a coincidence of aerodynamics and control responses, given that the latter happened in day VFR, right? -- C. E. Tate snailmail: BDM Federal, Inc. 1501 BDM Way, McLean, VA 22102 ____________________________________________________________ Happiness is a straight yaw string and an 800ft/min thermal.