Alexban
" And i think I can assure you that no profesional pilot will confuse a/c type with app type"
I do not doubt that whatsoever! that was not the meaning behind what i said, ive seen it said not in jest that CAT3 = 3 autopilots etc thats what i mean. I do sometimes hate posting in forums becuse of the whole missunderstanding thing

why do threads often go this way? I try to help, i do not claim to be the total authority on anything, far from it.
Id like to find out more on how the ng could be fail operational. Ill look into that one if i can or someone here may find the answer

I work on 3 autopilot aircraft so 737 i have no knowledge of.
Regards
Stu