CAP 56
CAT 3 is separated,
CAT 3a requires fail passive or fail operational autopilot.
CAT 3b Requires fail operational autopilot.
I am aware that the 737 can carry out CAT 3a, allthought with what ive learned, it is fail operational so it could do 3b. Im not sure how but im trying to find out at work how a 2 autopilot system can be fail operational.
safteypee i think got it when he mentioned the bus isolation on the 737. The 747 and 777 does this too. splits the buss supply to the AFDS into independant supplys, the 737 does this too and thats partly how it can achive fail operational 3b.
This is an intresting thread where im learning too, more on the operational side of autoland. im a licenced avionic eng and i like to know how the ops side of things are as well as the tech.
i hate the way ppl get so aggressive in forums you said to me "Your wrong", a very strong statment. pls read your post again. please be a bit more courteous no one knows it all. Any who claim too are fools and id be scared if they were pilot or engineer!
Rgds
Stuart