Determine the pressure altitude at an airport that is 3,563 feet MSL with an altimeter setting of 29.96.

To determine the pressure altitude, you need to adjust the measured elevation above sea level (MSL) based on the altimeter setting. The standard atmospheric pressure at sea level is 29.92 inches of mercury (inHg). When the altimeter setting is different from this standard pressure, the altitude reading changes.

In this case, the airport is at 3,563 feet MSL and the altimeter setting is 29.96 inHg. Since 29.96 is higher than the standard 29.92, you need to calculate the difference for every 0.01 inHg. Each 0.01 inHg corresponds to a 27-foot change in altitude.

The difference between the standard altimeter setting and the actual setting is:

29.92 - 29.96 = -0.04 inHg.

To find how many feet we need to adjust the altitude, multiply the difference by 27 feet per 0.01 inHg:

-0.04 inHg × 27 feet/inHg = -1.08 feet.

Now, adjust the airport elevation:

3,563 feet MSL - 1.08 feet = 3,561.92 feet.

Rounding to the nearest whole number gives