Date: 06 Jan 2000 01:26:26 From: firstname.lastname@example.org (Robert Dorsett) Organization: NETCOM / MindSpring Enterprises, Inc. References: 1 2
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In article <airliners.1999.1269@ohare.Chicago.COM>, ME Incorporated <email@example.com> wrote: >Andre <firstname.lastname@example.org> wrote ... >> What conditions can cause a elevator split operation in flight? > >There was much discussion on this subject after the EgyptAir flight. If one >pilot pushes his control yoke forward, and the other yoke is pulled back, >then the elevators will split in the direction required. This is to >compensate for a loss of ailerons and/or rudder control. It was never clear to me whether this discussion was based on accurate information. I.e., was the DFDR report for COMMAND input or actual elevator POSITION? If the latter, my understanding of the system suggests this does not make much sense. There's a command override function in the 757 (assuming that the model applies to the 767) that allows for a control column to "override" a stuck column. After that point, the input comes from the sole remaining column. The highly oversimplified operations manual diagrams do not suggest that there are two independent channels to the elevator actuators. Any 767 maintenance types out there who can clarify this? -- Robert Dorsett Moderator, sci.aeronautics.simulation email@example.com firstname.lastname@example.org "Bother," said Pooh when his engine quit on take-off.