High Wing Drifter
I have asked and asked and have never come across anyone who has ever heard of FM interference having actually happened.
There are much bigger problems with light aircraft these days, e.g. electric fuel pumps affecting fuel totalisers, own radio transmissions affecting oil pressure indicators, own RF emissions or power bus spikes causing autopilot crashes, landing gear pumps causing avionics malfunctions, and while these things can be extremely irritating to say the least, none of these issues are certification issues because the equipment in question is not legally required to work.
But we must be charitable! The people who bring us these wonderful regulations have families to feed, just like the rest of us. We live in a redistributive society these days
