tomkk
Well Known Member
This is related to Safety Directive SD-00001 for RV-12/12iS - Elevator Trim Servo but not directly related to the installation so I thought I'd start a different thread rather than hijack the other one.
Anyway, after installing the new trim servo the servo gets stuck at the extreme ends of the servo travel. By that I mean that near the extreme ends of servo travel the servo will not move using the cockpit trim switch. The only way I can recover is to disconnect the white & gray servo wires from the harness and use a 9v battery to move the servo back into the operating range. It happens at both ends of the range.
I looked at the RV-12 schematic and the PTRIM servo pos disappears into the AV-50000A Control Module as do the Trim Switch signals.
So far this hasn't been a problem in flight. I only discovered it when I ran the servo to its limits to time the transition. The new servo seems to run slower than than the old servo and I wanted to speed it up with the pot in the Control module.
Anyway, does anyone have a suggestion about what to do here? Since the servo itself seems to operate OK with an external battery at the extremes I assume it's OK and the fault is in whatever control circuitry is in the AV-50000 Control Module? Anyone else had this problem? Any suggestions?
Anyway, after installing the new trim servo the servo gets stuck at the extreme ends of the servo travel. By that I mean that near the extreme ends of servo travel the servo will not move using the cockpit trim switch. The only way I can recover is to disconnect the white & gray servo wires from the harness and use a 9v battery to move the servo back into the operating range. It happens at both ends of the range.
I looked at the RV-12 schematic and the PTRIM servo pos disappears into the AV-50000A Control Module as do the Trim Switch signals.
So far this hasn't been a problem in flight. I only discovered it when I ran the servo to its limits to time the transition. The new servo seems to run slower than than the old servo and I wanted to speed it up with the pot in the Control module.
Anyway, does anyone have a suggestion about what to do here? Since the servo itself seems to operate OK with an external battery at the extremes I assume it's OK and the fault is in whatever control circuitry is in the AV-50000 Control Module? Anyone else had this problem? Any suggestions?