Any instructor or checkie that gives that sort of scenario in the simulator deserved to get his or her marching orders because they are sadistic. That is the kind of scenario that is designed purely to 'break' the candidate and the chances of it hapening in 'real' life slim at best. I spent most of my career in the UK flying with Captains in their early 30's who had joined the airline in their late teens and early 20's as cadets. They went straigh from 180 hours into the right hand seat of DC10's, 747's, 767's etc. They were very capable, the more airline flying you do the more 'irrelevant' your single engine / ga experience becomes. Lets not forget that by the time these guys and girls become Captains they will have completed 3-5000 hours of flying in the airbus and will as such be classed in my book as 'experienced'.