Porknog

I just bought a Parkzone P51D Mustang BL and tried it out at the local park. All control surfaces were level and trimmed before launch, and the flight went well. Landing was not as graceful as it could have been, it wasn't a belly flop but it did hit a little harder than I intended. After inspecting for damage, it seems the left aileron servo is now stuck in an "up" position. I can physically adjust it with the power off, but as soon as I turn it back on it goes right back to that elevated position. It's far beyond what a trim setting can adjust for, it's really almost maxed out. I'm wondering if there is a way to re-centre the servo without cutting into the tape and physically adjusting the head? Or has the servo been damaged to the point it needs to be replaced? I hope not, especially since it was the maiden flight.

Porknog

Ok so after careful exploration, the tape covering the servo came off fairly easily and the servo lifted out. I removed the control arm, checked the range of motion which seemed fine, and replaced the servo arm in a better position. I guess the real test will be when I fly it again.

Saburo Sakai

Just what I've done when a servo spazzes:
Important addition: Unplug battery, stat!
Set trim on transmitter to complete neutral position and shut off power (this way when you're back in businessyou'll have centered trim). Disconnect servo arm from control rod. Power back on, battery reconnected, work servo through range of motion w/ tranny and see where she centers naturally. Disconnect battery. If needed, disconnect arm from servo itself and re-center it on servo hub for proper range, and/or reconnect control rod to servo arm accordingly, w/control surface centered perfectly.