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Thread: Autopilot Question

  1. #1

    Autopilot Question

    Have a 1978 Sierra with an STEC 50 autopilot and a
    Garmin 430. When I put the autopilot on heading mode,
    she will rock back and forth like we are on the ocean.
    If I set the heading bug to 270, then she will go
    from 260 to 280 and back again. It is usually pretty
    gentle, but sometimes not - and after a while, it gets
    annoying. When I have the autopilot on Nav mode, she
    rarely has the same problem. My avionics person
    cleaned out the autopilot gyros and put it back
    together, but it still does the same thing. Any
    thoughts?

    Mark Stuckey
    N5428M
    Macon, Georgia


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  2. #2

    Autopilot Question

    Sounds like aileron rigging to me.

    I would have it checked. It might be out just a little and it would be
    enough to rock the wings.
    Jeff Bryant
    Southwest Regional Director
    Beech Aero Club

    _____

    From: musketeermail@yahoogroups.com [mailto:musketeermail@yahoogroups.com]
    On Behalf Of Mark L Stuckey
    Sent: Tuesday, November 22, 2005 2:15 PM
    To: musketeermail@yahoogroups.com; bac-mail@beechaeroclub.org
    Subject: [musketeermail] Autopilot Question


    Have a 1978 Sierra with an STEC 50 autopilot and a
    Garmin 430. When I put the autopilot on heading mode,
    she will rock back and forth like we are on the ocean.
    If I set the heading bug to 270, then she will go
    from 260 to 280 and back again. It is usually pretty
    gentle, but sometimes not - and after a while, it gets
    annoying. When I have the autopilot on Nav mode, she
    rarely has the same problem. My avionics person
    cleaned out the autopilot gyros and put it back
    together, but it still does the same thing. Any
    thoughts?

    Mark Stuckey
    N5428M
    Macon, Georgia


    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org





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  3. #3
    Orbiting Earth Orbiting Earth corcoran's Avatar
    Join Date
    Jul 2004
    Location
    Braintree and Cape Cod, Massachusetts,
    Posts
    1,086

    Autopilot Question

    Mark,

    I have the same hardware you have (Garmin 430 with S-tech 50) in my 1978 Sundowner. I do NOT have the problem you describe so it is NOT normal.

    You get the wander on HEADING mode which eliminates the GPS/NAV as the problem. My guess is that it is something to do with your DG and heading bug as that's where the HEADING signal comes from. I assume all other in-puts are normal.

    I sometimes get a gentle porpose on altitude hold. Not always, just 1 in 20 times. Source of that in-put signal is the encoder.

    Are you sure the AP is getting it's signal properly? The wander sounds like when the AP is getting info from a VOR when the 430 is in that mode. So, when you hit HEADING on the AP... is it really reading the DG or getting signal from a VOR source?

    Tom Corcoran
    Boston

    -----Original Message-----
    From: Mark L Stuckey <mlstuckey1968@yahoo.com>
    To: musketeermail@yahoogroups.com; bac-mail@beechaeroclub.org
    Sent: Tue, 22 Nov 2005 14:14:40 -0800 (PST)
    Subject: [musketeermail] Autopilot Question


    Have a 1978 Sierra with an STEC 50 autopilot and a
    Garmin 430. When I put the autopilot on heading mode,
    she will rock back and forth like we are on the ocean.
    If I set the heading bug to 270, then she will go
    from 260 to 280 and back again. It is usually pretty
    gentle, but sometimes not - and after a while, it gets
    annoying. When I have the autopilot on Nav mode, she
    rarely has the same problem. My avionics person
    cleaned out the autopilot gyros and put it back
    together, but it still does the same thing. Any
    thoughts?

    Mark Stuckey
    N5428M
    Macon, Georgia



    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


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  4. #4

    Autopilot Question

    For what it is worth, I had a similar problem although the rocking was not as bad as you described it (maybe I am used to it ). I have an Appolo 60 and a Century II. Recently I replaced my alieron bushings and rod ends and rerigged the alierons. The hunting is minimium except in strong winds. It normally holds within 1 degree in nav or heading mode since the change and I can notice a better response to alieron input. I would suggest that you check for free play in your alierons and check the bushings and or bolts for excess wear.


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