PeytonM Posted October 31, 2012 Report Posted October 31, 2012 1989 M20J, electric cowl flaps. I close the cowl flaps completely upon leveling off, but within 15 minutes (or less) they will end up trailing open from 1/4 or so. I can close them again, but the cycle repeats itslelf: trailing open within a short time. What is the cause & cure? Quote
John Pleisse Posted October 31, 2012 Report Posted October 31, 2012 A guess...and olny a guess, forced air from cowling intake above. Quote
N601RX Posted October 31, 2012 Report Posted October 31, 2012 I was an engineer at an aerospace electric motor actuator manufacturer for several years. I don't think we made the actuator your referring to, but it was common practice to engineer enough friction into the motor and gearbox so it wouldn't "backdrive" when the power was removed. Sometimes this was in the form of a mechanical spring actuated brake, other times it was with gearbox design, bearing/bushing selection, or even just the thickness or amount of grease we used. Has the motor recently been sprayed with any lubricant? If so some may have got on the brake if it has one. 1 Quote
dougmilam Posted November 20, 2012 Report Posted November 20, 2012 I also have an 89J and had this same problem a couple years ago. The solution was "adjusting both cowl flaps to trail 1/4 inch IAW Mooney M20J Maintenance Manual 71-13-02." It doesn't completely make sense to me, but the problem never occurred after that. Quote
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