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Elevator: Up And Down At The Same Time?  
User currently offlinec5load From United States of America, joined Sep 2008, 917 posts, RR: 0
Posted (3 years 12 months 3 days 7 hours ago) and read 2980 times:

I didn't know how else to word the title, but I was watching "Air Emergency" yesterday and the case of Egyptair 990. One of the scenarios of the crash was that the Capt and FO were putting opposite inputs on the yolk causing the elevator to deflect up and down at the same time. How is this possible? And even if complete opposite inputs were the case, why did the airplane still go nose down, wouldn't it cancel each other out?


"But this airplane has 4 engines, it's an entirely different kind of flying! Altogether"
2 replies: All unread, jump to last
 
User currently offlineKELPkid From United States of America, joined Nov 2005, 6265 posts, RR: 3
Reply 1, posted (3 years 12 months 3 days 7 hours ago) and read 2964 times:

Quoting c5load (Thread starter):
One of the scenarios of the crash was that the Capt and FO were putting opposite inputs on the yolk causing the elevator to deflect up and down at the same time.

In a GA plane with dual controls, this would be impossible, the stronger person would win (or you'd break the control system by battling each other   ). I don't know how a transport category jet with mechanical controls (like the 767) is different, but I would think that there would be some sort of combiner in the control system.

In a dual control GA plane, if you turn or push or pull the yoke (not the yolk    , that's what's in the middle of my egg in the mornig), the other one does exactly the same thing. Same with the rudder pedals.



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlinegoldenshield From United States of America, joined Jan 2001, 5845 posts, RR: 15
Reply 2, posted (3 years 12 months 3 days 6 hours ago) and read 2929 times:

Quoting KELPkid (Reply 1):
I don't know how a transport category jet with mechanical controls (like the 767) is different, but I would think that there would be some sort of combiner in the control system.

All transport category aircraft have not one, but two ways to control the plane. The captain will have control of the left side, and the first officer, the right, with each control connected to each other via a control interlock, so this way you can seperate the ailerons, rudder, or elevator. Thus, in the event that one side sticks, the other side can be disconnected and operated freely. Or, in the situation you described, opposite inputs would cancel out.

[Edited 2010-04-23 11:03:00]


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