Flinty, he is reffering to the core lock of the CRJ, when 2 pilots took the aircraft above the ceiling for the weight, changing seats in flight and so on...and finally crashed..
If the thread has to drift to High altitude flying, and the like, then it has to be restricted to people flying above FL450 routinely...
This is leaving a lot of persons behind
but this very little place of atmosphere of 6000 ft ( FL450 to FL 510) is a very privileged area; a bit like CAT3B landings in Bizjets, there is 3 groups, the one who will never see it or do it; the one's whow speak about it without actually flown them, and the one's whom are flying them or flew them..
Now, CRM is equally important on that day, what are you showing to your green copilot ? ( not so green in a CAT3B
) your leg mate ? or Part A states that this is mine . Sorry I cannot give you the landing there is only one HUD , and it is on my side, but please call the deviations