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Date: Sat, 05 Jul 2008 08:04:50 -0400
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Subject: Re: [LML] Re: Runaway trim
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From: "John Schroeder" <jschroeder@perigee.net>
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Jeff -

I have had a pitch trim relay go bad. The symptoms: intermittent operation to trim nose down and no problem trimming nose up. It didn't take much to have to hold a lot of forward stick to control it. Fortunately, it started working again after a few minutes ( about the time I was ready to head for the nearest airport.).It happened a couple of times on the trip to TX for Lancair fly-in in October last. Tim said that the Ray Allen relays for the coolie hat trim setup are notoriously bad and that he carried a spare with a connector on the end for quick change-out. We changed to the Mod 2 model (different form/dimensions) and it has worked well ever since. We never did get an uncontrolled input of pitch trim.

My data point.

John Schroeder
LNCE 205 hours


On Wed, 02 Jul 2008 23:05:21 -0400, <vtailjeff@aol.com> wrote:

> With all this discussion about trim, I thought I would add my 2 cents. A IVP can be difficult to fly with inoperative pitch?trim-- too much stick force required. Having said that, in over 1200 hours of flying more than one IVP aircraft, I have never had a trim runaway. I also have never heard of one of these servos running away. If anyone has seen a RAC servo "runaway", speak up now. The more likely scenario is a trim servo that will not work at all. Unless someone can confirm a runwaway servo I think this discussion is much ado about nuthin'.
>
> Regards,
>
> Jeff Edwards