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#1
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just a thought, i needed to replace the bolts on the elevator attachment fittings, they had
just a very slight wear. replacing the bolts cured the problems, and it is very easy to do. didn't take me 1/2 hour. i could not believe that such slight wear could cause that. 
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#2
06-11-10, 11:55 PM
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I had this happen as well but it was at cruise speeds. Anyway, my IA said he felt the cause was the cable tensions in the elevator were out of tolerance. He made the appropriate adjustments and I have not experienced this again. It has been probably 5 years now.
Ed
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#3
06-12-10, 08:06 PM
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I found the culprit to be improperly torqued attatchig hardware. The elevator itself is in a low frequency flutter. This could be problematic if left to it's own devices but I found that a change in rear prop RPM would throw the flutter out of phase and interupt the cycle for a while. Anyway two minutes with the end wrenches fixes the problem. One should note that most mechanics fear over tightening the bearings and will not quite finish the job. So a bit more than snug doesthe trick.
_travis
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