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Thread: Elevator cable slacking

  1. #1
    Jim's Avatar
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    Default Elevator cable slacking

    Hi,

    In process on another annual and found something my A/P is curious about. The two elevator cables running along the bottom of the floor are the center one and the right. The left is the flaps. When the control wheel is pulled back to the elevator horn stop on the tail post both cables remain tight. When the wheel is pushed forward to the elevator stop across the fuselage tail the cable developes some slack mid cabin on the floor. It doesn't drop/slack much, maybe 3/8", but definently noticeable by watching or handling the cable. Without spending a lot of time second guessing possibilities we're wondering if this should, or not be of concern. Both ends of both of the cables are on a horn or attached to the lower end of the control column under the front floor. Right off we can't see how or where slack can be coming from. Is there some magic going on down there that we're not aware of? We just don't yet see how or where the slack is originating. If the horn is a little longer on the top or bottom for some reason or other it could explain it, but......

    Thanks!

  2. #2
    Administrator Steve Pierce's Avatar
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    Default Re: Elevator cable slacking

    My Clipper did the same thing, noticed when taxiing with the stick all the way back. Can't tell you why, maybe the two bell cranks are different lengths?

  3. #3

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    Default Re: Elevator cable slacking

    Normal. The control surface horn should contact it's stop before the cockpit control hits it's stop. If not, under flight loads the control surface would not reach it's stop.
    Assuming all control stops are set correctly.

  4. #4
    Jim's Avatar
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    Default Re: Elevator cable slacking

    Thanks guys!

    We've kind of concluded Piper used cable/horn trickery to balance control input efforts between pushing and pulling.

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