STEK 50 Autopilot Problem

STEK 50 Autopilot Problem

Hi

I have an Stek 50 on my 1976 182 and have a problem with the altitude hold. When engaged the airplane stays level for up to 30 seconds and then it pitched down heavily.

The "computer" has been replaced, all sensors serviced and still the problem does not go away.

Any clues?

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Re: STEK 50 Autopilot Problem

This may not have anything to do with your situation, but I discovered my S-Tec 55 would do exactly the same thing when I tried to use the manual trim with the altitude hold engaged. I tried to increase my altitude with the manual trim (this can apparently only be done with the VS knob) while the autopilot tried to maintain altitude. When the computer failed from the conflicting input, the plane was in a very nose-down trim setting. Quite surprising. Careful reading in the manual states the error of my ways. Well, I hope this can help in some way.

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Re: STEK 50 Autopilot Problem

My STEC-30 does not have electric trim. When I set altitude hold mode, if necessary, it tells me to trim up or down so it can hold the altitude at the set level, and the airplane be at the proper attitude. It would seem to me that you are putting a strain on the system by trimming a lot while the autopilot is in altitude hold mode.
Glenn

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Re: STEK 50 Autopilot Problem

I have a T210L with the same autopilot.  A similar problem came up several years ago.  I had everything checked and double-checked.  No help - so the only logical solution I could think of as an engineer were the wiring harnesses.  And sure enough, one of  pins inside a connecter under the dash had backed off causing this problem.  Easy fix, but became a costly one!

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Re: STEK 50 Autopilot Problem

Just read your post today...  I had heard about S-TEC autopilot problems (I have a model 50 in my Mooney), and found a good explanation on the Avionics West website.  By the way, their site is full of all sorts of useful aviation-related information, and they are located at Santa Maria (SMX) - same field as the Cessna Pilots' Association!  Hopefully the link below will shed some light on the problem...

http://www.avionicswest.com/bulletins/S … 3.htm#2004

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Re: STEK 50 Autopilot Problem

I had the same problem with my Beech.  After spending almost $6000, we found that a static line "t" fitting had either insect larve or nest inside.  All ground checks indicated that unit worked properly in all phases.

Good luck, I hope this helps.

Tony Wright

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