MSA given as 12,000ft, flying over mountains in temperatures +90C, QNH set as 1023 (obtained from a nearby airfield). What will the true altitude be when 12,000ft is reached?

1) An isohypse of the 500 hPa pressure surface is labelled with the number 552. This means that for all points on the isohypse the:

2) If a pilot changes the altimeter setting from 30.11 to 29.96, what is the approximate change in indication?

3) If a pilot changes the altimeter setting from 30.11 to 29.96, what is the approximate change in indication?

4) If it is necessary to set the altimeter from 29.15 to 29.85, what change occurs?

5) If it is necessary to set the altimeter from 29.15 to 29.85, what change occurs?