wow, dangerous thread ! [&o]

It seems a customer send this photos to FEJ with ask to replace a plane that had a structural failure, and FEJ is in preemptive mode because they can't garanty how the pilot "use" the plane.

My advice to FEJ :

As I'm working in a real airplane company, we ensure and take the responsability that if one our products is certified for +4.4/-2.2G (cessna stc parts) as asked by FAA and EASA for europe, as long as the pilot fly the plane as specified in the pilot flight manual, it is not possible that there is a catastrophic structural failure and we are responsible for that. The certification process ensure that correct calculation and tests had been done before certification and that production of those parts is quality controled to ensure they respect the certified configuration and mechanichal resistance.

If there is a plane crash, the enquiry will first verify if the plane was used as per the flight manual : not overweighted, correct CdG, quality of oils and fuel, correct mechanichal state, etc.

As in RC industry I've never seen a manufacturer sending to pilot a flight manual. I, as a pilot, go with the idea that if I use the reccomanded parts and options (engine, servos, build as per notice furnished), and fly the plane normally as the manufacturer conceived it for (here a scale model of a jet fighter) I can be in confident state that the plane will not broke at the first 10G turn, and 10G is not high for a RC model !!!

So If FEJ send me a flight manual statuing that I should not go over 15G and not go over 250km/h, and if by meaning of internal flight conditions recording (that easy now) I can demonstrate that I've never exceeded the manufacturer parameter, then the failure is responsability of the manufacturer.

The problem start by the fact that we don't know how this model was calculated and what are the parameters certified by the manufacturer as "correct use of this plane".

If a manufacturer say me : my model is not made to go up to 200km/h speed, that's not a problem for me. I'll fly it below 200km/h but don't want a major structural failure. If I go up of that, I now this is my responsability.

Not a easy thread...