AP-74 and runaway trim?

cjohngraham

I love flying!
Joined
Aug 5, 2016
Messages
18
I have a HDX, AP-74, and Ray Allen elevator trim servo in my RV-7A (no manual elevator trim). I also fly 182s with G1000 for CAP. Recently, CAP issued the following safety alert video concerning an autopilot-induced runaway trim condition: https://vimeo.com/321309420/dd3cf0c744

Is this sort of failure known to occur with the Skyview/AP-74? For runaway trim, Ray Allen says to actuate trim in the opposite direction for 3 seconds. Is that sufficient? Thanks.
 

Raymo

I love aviation!
Joined
Apr 25, 2016
Messages
1,037
Location
Richmond Hill, GA
The AP Button panel includes runaway trim control (kills output if engaged for > 3 seconds). From what I've read, the problem is usually within the servo, though.
 
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