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Old 4th June 2011 | 23:18
  #10 (permalink)  
Machinbird
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Joined: Jul 2009
: ATP+Mil
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From: Not far from a big Lake
To put this thread in context. Probably the classic downburst accident, Delta Flt 191.
http://www.airdisaster.com/reports/ntsb/AAR86-05.pdf
The PF control inputs initially were good, but then he started to push the nose down to avoid stick shaker.

A control column force analysis performed by Lockheedshowed that a 22-pound push force was applied to the control column about 12 seconds before initial touchdown. Over the next 4 seconds, the forces were reversed, and by 8 seconds before impact, a 25 pound pull force was being exerted. Overthe next 7 seconds, the forces again reversed and by 1 second before impact a lo-pound push force was being applied. Duringthe last second the push force was decreasing.
The CVR recordings are available online in a number of formats.

I think I would have just set ~7 degrees nose up and set max thrust and ignored the stick shaker once go around was decided.

I was discussing this accident with someone else, as an example of task saturation.

As a Naval Aviator, this approach seems (to me) to have a lot in common with a night approach to the ship. Of course, over the quarter century since I last read the accident report, I had confused the aircraft type and airline, but the inexplicable nose down inputs have stayed engraved in my brain.
Since the northern hemisphere is moving into Summer, this is probably a timely topic.

Note: The airdisaster.com website has been very very slow. Try to be patient with it.

Last edited by Machinbird; 5th June 2011 at 05:08. Reason: add control input paragraph/remark on airdisaster.com site
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