What is the pressure altitude if the indicated altitude is 1,380 feet MSL with an altimeter setting of 28.22 at standard temperature?

To determine the pressure altitude, you need to understand how the altimeter functions and how to adjust the indicated altitude based on the altimeter setting. Pressure altitude is the height above the standard datum plane (29.92 inHg) when the altimeter setting is adjusted to standard pressure.

In this scenario, the indicated altitude is 1,380 feet MSL (Mean Sea Level), and the current altimeter setting is 28.22 inHg. First, we calculate the difference between the standard atmospheric pressure and the current altimeter setting:

• Standard pressure is 29.92 inHg.

• Current pressure is 28.22 inHg.

The difference is:

29.92 - 28.22 = 1.70 inHg.

This difference must be converted to feet. A standard rule of thumb is that 1 inHg is approximately equal to 1,000 feet in altitude. Therefore, you can multiply the difference in inHg by the conversion factor:

1.70 inHg * 1,000 feet/inHg = 1,700 feet.

Next, since the current pressure setting is lower than the standard pressure, the pressure altitude will be above the indicated altitude. Therefore, you add this altitude gain to