A private pilot corrects her altimeter to reflect a reported altimeter setting o

Question

A private pilot corrects her altimeter to reflect a reported altimeter setting of 1012 mb at her departure airport. She then climbs to an indicated cruising altitude of 1000 m above sea level. The highest terrain elevation between her and her destination is 850 m above sea level, which yields a fairly comfortable margin of 150 m. However, she does not realize that she is flying into an approaching low pressure system and that the correct altimeter setting will decrease to 992 mb well before she reaches her destination.

a) If she fails to update her altimeter, what will her actual altitude margin be in the worst case as she crosses the highest terrain?

Explanation / Answer

When altimeter set for 1012mb It has ended at 992mb well before her destination safely. This shows a zero error in the altimeter which is equal to 1012 - 992 = 20mb. So for 1000m , it is 20 hence for 150m marigin altitude error would be 3. Hence the actual margin is 150 + 3 = 153m.

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