Pontius
And, oh my god, I've just thought of another thing that will probably cause me to crash and it's certainly worth investigating immediatley; the Yanks say 'altimeter setting' and not 'QNH'
Just think what problems THAT could cause........(none for me but, no doubt, a worthless HF exercise would say otherwise).
Just trying to simplify that decision making flow chart for those who work for big British airlines. When across the pond, you may remove all the boxes, arrows, and diamonds representing the extra steps for figuring out which instrument(s) should be adjusted in response to QNH information.