Reboot, we operate with A n C Engineers with avionics ext, I personally have had it for 6 years. It would depend on the type of training and the scope of the ext E, our training on the 744 for example is 4 weeks, not the 1 day lectures some seem to have! No that doesn't make me an expert! But I do have a good knowledge of the way things work. I'm not saying it's right or wrong, if it's done properly it can work. JAA 66, there are 2 types of licence mechanical and avionic. Mechanical type people, A n C, will have to get the X licence so as as to convert to a JAA licence all you have to do is Module 5 digital fundamentals.
There seems to be much disension for whatever this RMA thing is, and it seems to be at Big Airways and it seems they they, the co, have deskilled the role of the LAME. I would hazard a guess that when the delays seem to be every other flt and the ASR's and MOR's start to increase then just maybe they will have to have a rethink, but by then it'll be probably too late and the experienced LAME's will be elsewhere.