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B752 Elevator Control Cable Routing

Posted: Mon Aug 22, 2005 3:54 pm
by HAWK21M
Why is there a Difference in the Routing of the LH Elevator Control cable routing & the RH Elevator control cable routing on the B752.
Is it to cater to an Impact damage not destroying both cables.What is the reason.
regds
MEL

RE: B752 Elevator Control Cable Routing

Posted: Mon Aug 22, 2005 11:13 pm
by cdfmxtech
The exact Gee Wiz info for going up with capts and down with FO's, I don't know. But I would suspect it's just for added protection from losing both elevator in a serious failure of some kind. On the 767, the Capts go up and f/o's cables go down.

RE: B752 Elevator Control Cable Routing

Posted: Mon Aug 22, 2005 11:18 pm
by DH106
Erm... how do you get bi-directional control on each of the two elevators when they 'split' then ?

RE: B752 Elevator Control Cable Routing

Posted: Tue Aug 23, 2005 2:16 am
by air2gxs
Captain's (left) elevator control cables run up and to the left, F/O's (right) run down and to the right. They are bussed together both below the flight deck and at the aft, left and right control quadrants. At either point the system is capable of shearing out and allowing control from either column.

The problem occurs when both shear out and allow independent motion of each elevator. But, there is an elevator assymetry limiter which physically (I seem to recall) limits the assymetry to something like 10 degrees.

To answer your question Hawk, the cables are run seperatly, along different routings, so that a single, localized failure won't compromise the elevator control system.

RE: B752 Elevator Control Cable Routing

Posted: Tue Aug 23, 2005 5:31 pm
by HAWK21M
Quoting Air2gxs (Reply 3):
To answer your question Hawk, the cables are run seperatly, along different routings, so that a single, localized failure won't compromise the elevator control system.

So My Guess was correct.Thanks Again.
Has a Cable Snag ever occured on the B752 ever.
regds
MEL

RE: B752 Elevator Control Cable Routing

Posted: Tue Aug 23, 2005 10:26 pm
by air2gxs
Quoting HAWK21M (Reply 4):
Has a Cable Snag ever occured on the B752 ever.

I can't answer for ALL B757, but I've never had an elevator cable issue on a B757. I've seen rudder a problem that resulted from a cable issue.

RE: B752 Elevator Control Cable Routing

Posted: Tue Aug 23, 2005 10:59 pm
by HAWK21M