Altimeter settings/AutoPilots.
I am studying for my ATPL exams and was wondering what would happen when there are large differences between QNH and 1013 with an autopilot engaged.
For example if the QNH was say 993 or say 1028 and I was at Transition Level of 60 and then cleared to an altitude of 5000 feet. How would the Auto Pilot react when I changed the datum setting and I selected LVCH.
Is there any sequence of resetting the altimeter and selecting LVCH to prevent the Auto Pilot from behaving in an un toward manner.