Discussion
An aircraft departs an aerodrome where the QNH is 1030 hPa and flies to one where it is 995 hPa without resetting the altimeter.
What is the situation on arrival?
Answer: A
Correct answer: The aircraft is lower than the altimeter indicates
The setting of 1030 hPa is still in the subscale, but the actual sea level pressure is now 995 hPa, 35 hPa lower. At roughly 30 ft per hectopascal that is about a thousand feet of error, and the error is in the dangerous direction: the instrument overreads, so the aircraft is a thousand feet lower than the dial suggests. High to low, look out below.
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