Discussion
An altimeter set to 1013 hPa reads 8000 ft where the local QNH is 1003 hPa. Using 27 ft per hectopascal, the true altitude above sea level is approximately
Answer: C
The local pressure is 10 hectopascals below standard, so the aircraft is about 270 feet lower than the standard setting suggests. Flying from high pressure to low pressure without resetting leaves the aircraft lower than indicated.
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