An aircraft flying at FL 45 (OAT 6°C) obtains a reading of 1860 ft on its radio altimeter when flying over ground 3090 ft above mean sea level. What is the value of the QNH, to the nearest hPa, at that point?

1) What is pressure altitude?

2) The general circulation of air associated with a high-pressure area in the Northern Hemisphere is

3) Units used for measuring atmospheric pressure are

4) The atmospheric pressure at a pt may be defined as

5) The atmospheric pressure at a specific level may be defined as