Question

With the altimeter reading 6000' while set to 29.41, what will it readWhen set to 29.91?

A) +500 feet
B) -500 feet
C) +1000 feet
D) -1000 feet

Answer 1

Changing the altimeter setting from 29.41 to 29.91 signifies an assumed increase in sea level pressure, causing a 500 feet increase in the altimeter reading from 6000' to 6500'.

Step-by-step explanation:

When the altimeter setting is changed from 29.41 to 29.91, this represents an increase in the assumed sea level pressure. Since the actual aircraft altitude has not changed, but the altimeter setting has increased, the altimeter will read a higher altitude. For every 0.01 inch of mercury (inHg) change in the altimeter setting, the altimeter reading changes by approximately 10 feet. Hence, a change of 0.50 inHg (29.91 - 29.41) will result in a change of 500 feet (0.50 inHg × 10 feet/inHg). Therefore, the altimeter will read 500 feet higher, which means the new altimeter reading will be 6000' + 500' = 6500'.