JR rx, heard bad things
Well I certainly hope no weedeaters or aircraft fall the from the sky like "raindrops falling on your head"!!! Would need a good umbrella.
By the way, what receiver, servo, extensions, etc were involved in this? There are all knds of things that can happen.
Here is and extrmely rare scenario. A servo motor can die (defective, or caused by fatigue from flutter in surface, etc.), lockup, and result in a blown servo amp. Blown servo amp can be a short, sending 5V to the signal pin and damaging the decoder IC of the receiver. I have seen this happen several times.
Bottom line, sometimes some goofy problem in a dying servo can kill one channel in a receiver.
Could also be something as silly as one cracked solder joint.