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Intermittent elevator trim

rvator4twa

Well Known Member
Patron
Had a flight with elevator trim inoperable. Tried a bigger fuse and worked again. After it quit again, I examined the area and discovered the threaded bar between the trim tab and trim motor was catching sometimes on the threads. Used a dremmel to lengthen the slot and problem is solved.
 
Thought extending slot for trim tab push rod fixed problem but not for long. According to Gary at Ray Allen, I need a new trim relay and to test it he said when access is available, tap the relay to see if it works. Sure enough. I only have 250 hours on airframe but new replacement relay is beefier.
 
This is a well known problem with older Ray Allen relays. Very common years ago. I think they must have changed the design, becasue I haven’t heard of any recent failures in newer installations.

Paul
 
Trim relay

True Paul. I had the relay deck 1 and am installing deck 2 which looks over twice as tall. Expect to not have that issue again.
 
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