Originally Posted by
tae9141
Hey guys,
He mentioned that the HUD cannot be used during CAT lll b for 737MAX and I cannot find out the reference where it states such limitation on pilot.
After re-reading your question, I believe what your instructor was referring to is that the HUD is a "fail-passive" approach system, as opposed to "fail-operational", and thus limited to CAT IIIa operations. See
FAA Advisory Circular 120-28C for further details.