Posting for a friend who suddenly went nose down 45 degrees plus enroute home from OSH. RV9A with a new Tru Trak.
Disconnect button did not release the pitch servo. Torque might have been set too tight also, since the pilot reported pulling hard with no effect.
Autopilot power switch released the servo. No trim motor excursion was noted.
Has anyone experienced a similar event? As his instructor, I had previously had his avionics people put a pull-able breaker on trim motor. But this event did not involve pitch trim.
The disconnect button should provide a quick solution to the pitch down.
It did not.
Altitude degraded fast and became a threat.
So, looking for well thought out responses here involving either direct experience or thoughts to diagnose the fault and or prevent another occurrence. Thanks!
Disconnect button did not release the pitch servo. Torque might have been set too tight also, since the pilot reported pulling hard with no effect.
Autopilot power switch released the servo. No trim motor excursion was noted.
Has anyone experienced a similar event? As his instructor, I had previously had his avionics people put a pull-able breaker on trim motor. But this event did not involve pitch trim.
The disconnect button should provide a quick solution to the pitch down.
It did not.
Altitude degraded fast and became a threat.
So, looking for well thought out responses here involving either direct experience or thoughts to diagnose the fault and or prevent another occurrence. Thanks!