Originally Posted by
ampan
#1AHRS: The difference between what you did and what Capt Collins did is that you actually had visual meteorological conditions, whereas he didn't.
Under the cloud he did - in "by the book" terms anyway, the Mac Central controller told him so - 40 miles plus visibility (the maximum in aviation terms meaning anything from literally 40 miles to the horizon). The fact that the book was not sufficiently informed to take sector whiteout into account was not something Collins was aware of, and not something he should carry the can for.