Pressure and altimetry · Question 5 of 12
What does the altimeter show on the ground when QNH is set?
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Answer
- A The elevation of the aerodrome above sea level
Explanation
QNH is the air pressure reduced to sea level. With QNH set, the altimeter shows the altitude above mean sea level, so on the ground it shows the aerodrome elevation. With QFE it shows zero on the ground, and with 1 013.25 hPa the pressure altitude or flight level.