Gábor,
Thank you for helping us to get the correct information.

(As posted in the Club house discusion Forum)

It is IMPERATIVE that we take note of this incident and we seem to be in agreement with respect to importance of safety.
This must improve our safety awareness and I’m sure it will. For those who take this incident without the due attention it warrants, I say for the good of us all, please change the way you view your hobby and take it more seriously. You can help to educate your club members who are new to the hobby.
I must interject with respect to interference and the "PCM" myth.. After viewing the short video, it seems that the pilot has competent flying skills and I would say that he is probably over the flight line and not the crowd…. There are to many unknowns for us to be able to identify the cause of this crash…. PCM receivers (contrary to some of the ret erect) only lock for as much as 1.5 seconds and then cycle back on to recapture the transmitter signal. I have first hand knowledge of this operation. I was myself flying at an “Air show” (full-scale) when my receiver locked out during a flight… I had control for 2 seconds and then no control for two seconds and then back on, until I eventually put the plane down in an unpopulated part of the airport….Luckily the grass strip we were using at the time. Damage to plane was repaired and the eventual culprit was within the receiver it self.. The possible causes for this fatal severe crash in Hungary, could be Battery, servos, connectors, switch contacts, or the receiver itself…or any connecting wiring… or even a glitch buster between the receiver and servos.. I hesitate to point at a PCM receiver though as there would likely have been stick input at some point and it would have shown up in the aircraft attitude between Lock outs before going in…. If any of you have ever experienced a severe glitch in your FM receiver, resulting in a crash, you will agree that you have absolutely NO CONTROL over your craft as long as a glitch is present….The video appears to show that the plane is not responding at all from the bottom of the split “S” until the crash. Barring statistics on FM vs PCM receiver internal failure rates, I would suggest that more aircraft crash (while experiencing a radio glitch problem) flying with FM receivers than PCM receivers. The PCM receiver diagnostic (lock out function) tells you something is wrong while giving you a chance to bring the craft down safely or put it in, away from the crowd… Having 18 years of RC experience and having flown at & CD,d RC involvement at full scale air shows for 11 years, I can fully appreciate the logistics of putting on Model flying displays and the safety needs as well. Our own Distance of crowd to spectators is usually 500 feet: 5 times the MAAC requirements. We are all susceptible to a failure at some time… We can minimize the severity of consequences resulting from failures by learning from our mistakes, and even better, learning by others mistakes who come before us.
Please be safe.

Cheers.
Rob ,
RCFCBC
British Columbia
Canada.

It appears that (REGAURDLESS OF PCM or FM Receiver) the culprit was interference (from another source) Either way an accident is unavoidable in such circumstances and there is no predictability to the eventual crash.

Our Condolences to the family of the couple and the RC pilot


Rob.