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Thread: Intermittent Electric Trim Actuator

  1. #31

    Join Date
    Sep 2012
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    San Francisco
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    Default Re: Intermittent Electric Trim Actuator

    Quote Originally Posted by DesertFox4 View Post
    Thanks Dan for the update on this issue. Hope your info will save others down time and some money also.
    No problem. Wanted to add that if people are willing to tolerate a momentary contact toggle switch rather than the more convenient rocker switch, you can get a mil spec switch with the same wiring. The Aircraft Spruce part number is MS35059-27

    dan

  2. #32
    Super Moderator desertdave's Avatar
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    Jun 2019
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    Scottsdale AZ
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    Default Re: Intermittent Electric Trim Actuator

    Giving this another bump and another update for those with the Skystar grey colored trim switch. I went flying two days ago and the electric trim only worked one way. No biggie, drop the flaps to 1/2 and the plane was trimmed nicely. Landed and back at the hanger things worked again. I had bought a new switch and bezel from Kitfox a few months back and swapped the old for the new. Afterwards I disassembled the old switch and found a bunch of debris in the housing and a bit of arcing. My advice to anybody running the old type, gray colored switch is to swap in a new switch of your choice.

    IMG_2412.jpg
    Dave
    KitFox 6 Taildragger
    912 ULS
    IVO IFA Medium Prop

  3. #33

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    Sep 2012
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    Default Re: Intermittent Electric Trim Actuator

    Quote Originally Posted by airlina View Post
    John, here is a place to start for the trim actuator www.motionsystem.com. I suspect that ours is a model 85615/85616 however I am not positive about this. We will need someone who is still building to see if they can find a model number on their actuator as mine is buried in a completed airplane. Bruce Lina N199CL
    Update on this for anyone looking for the company making this actuator, it appears it has changed names: https://www.actuator.com/products/

    Turns out the rod end they supplied is not the best quality and is very sticky so I was looking for a replacement on aircraftspruce but neither HM nor Aurora has a part as compact as what is supplied. The closest match is the GMM-4M-470 AURORA BEARING but its likely I will just have to use the sticky ball end unless I want to replace the whole actuator.

  4. #34
    Denalifox's Avatar
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    Feb 2019
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    Palmer, Alaska
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    117

    Default Re: Intermittent Electric Trim Actuator

    Is there some form of slippage or clutch to allow the motor to continue to spin when the actuator hits either limit? Reason I ask is I don't use the trim indicator. I just turn around and when the horizontal stops moving I release the button.
    S7 STi O-320 currently flying

  5. #35

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    Sep 2012
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    Default Re: Intermittent Electric Trim Actuator

    Quote Originally Posted by Denalifox View Post
    Is there some form of slippage or clutch to allow the motor to continue to spin when the actuator hits either limit? Reason I ask is I don't use the trim indicator. I just turn around and when the horizontal stops moving I release the button.
    The ball screw just freewheels at each end of the range of motion, there is no clutch. When the actuator hits the end of its range of motion it simply stops extending/retracting while the motor keeps spinning at the same RPM.
    Last edited by 3kdscf; 07-29-2022 at 03:56 PM.

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