Originally Posted by vikena
suppose your status page says CAT 3 single only.
Can you do a CAT 3 B no DH approach?
(...)
yes I know what the FCOM says.
Mad(flt)Scientist gave you a very good answer - it's a certification requirement, independent of airplane type/manufacturer. In order to be IIIb qualified you have to have working fail-operational system and that's what FMA tells you: CAT3 SINGLE = fail-passive, CAT3 DUAL = fail-operational.
Now I'm curious; were you asked this question by someone who wouldn't take "It's a limitation, for a
's sake!" as an answer?