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Thread: Mixture Control

  1. #1
    Lownslow's Avatar
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    May 2009
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    Victoria, Texas
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    Default Mixture Control

    I remember a discussion on this site regarding replacement of the old Piper mixture control with a vernier control. I haven't been able to pull it up in a search. ACS has the MC-600 p/n 05-01254 listed for the PA-22's and I have recently purchased one for installation in my project. I am having difficulty with the installation, as it appears the vernier "body" that extends forward (behind the panel) is too long and is interfering with the flight control sprockets and chain. It appears that the mixture control cable behind the panel would have to be supported in a severe bind to clear the control column chains, and even then leaving the vernier control and knob out of alignment on the pilot's side of the panel. Are there any installation tricks out there that makes this cable the right choice for an upgrade or is there another anyone would recommend? This just doesn't look right to me, but I've been told I don't look too good.

    Lou S.

  2. #2

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    Jun 2010
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    Hutchinson, MN
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    Default

    I just saw the article on Andy's site today. It has the PN's. I believe Homer had it installed via a field approval.

  3. #3
    Twofieros's Avatar
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    Jan 2011
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    Lou,

    When you figure how to do this will you post details for the ones after you? I'm going to be one of them.

    Tim

  4. #4

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    Mar 2010
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    Colorado Springs
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    Default

    I installed vernier mixture and throttle controls as a portion of a major rebuild of my cockpit area and the instrument panel. I used the Gubler STC to reposition the tubes behind the panel to gain more freedom in designing the panel. Part of this STC involves separating the panel into upper and lower portions where the lower portion contains the engine controls. As indicated in the photo I moved the throttle and mixture controls to the center of the lower panel. As discussed above there was significant interference with the flight controls behind the panel if the controls were installed perpendicular to the panel. My solution was to install the controls on beveled aluminum strips such that the cables were about 15 to 20 degrees from perpendicular to the panel to gain clearance with the control mechanism. Much time was spent on finalizing this approach so that my IA would sign off on it.


    controlswithtrim.jpg

  5. #5

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    Dec 2007
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    Indian Hills Airpark AZ 2AZ1
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    I've got one installed in my plane by the previous owner. I'll take a look to see what part numbers were used and how it was rigged.

    Paul
    N1431A
    2AZ1

  6. #6

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    Jan 2012
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    Default Mixture creeping out!

    I have noticed that my mixture control continually creeps outwards with vibration so that if I take my eyes off of it for a minute or two it will have moved several 5-10mm toward lean. This is obviously an unsafe condition. Does anyone know of a replacement mixture with a more conventional vernier/adjustable friction lock mechanism I can have installed?

  7. #7

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    Default Re: Mixture creeping out!

    They are spendy but you can buy a PMA'd cable from McFarlane. A&P can install.

    Tim

  8. #8
    Gilbert Pierce's Avatar
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    Nov 2007
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    Default Re: Mixture creeping out!

    Aircraft Spruce sells a cable with slight detents to prevent slippage. I had one on my mixture and carb heat.

  9. #9
    Stephen's Avatar
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    Nov 2007
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    Default Re: Mixture creeping out!

    I like the McFarlane vernier that I install on my Pacer.
    "You can only tie the record for flying low."

  10. #10
    Jim's Avatar
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    Nov 2007
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    Default Re: Mixture creeping out!

    Hi,

    Mine was doing that too, but I was able to fix it pretty easily. Just behind the knob on the mixture cable there's a couple of inches of rod before the flexible length starts. I bent that just a little and the mixture stopped creeping.

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