IFS Stage III Gouge 2025 – 400 Free Practice Questions to Pass the Exam

To determine the density altitude, you start by calculating the pressure altitude and then adjust for temperature differences from the standard atmosphere.

The first step is to find the pressure altitude. This is calculated using the altimeter setting. Standard atmospheric pressure at sea level is 29.92 inches of mercury (inHg). When the altimeter setting is higher than this, such as 30.35 inHg, it indicates that the actual air pressure is higher than standard pressure at a given altitude, thus resulting in a higher pressure altitude.

Next, you can find the pressure altitude by using the formula:

Pressure Altitude = (Standard Pressure - Altimeter Setting) × 1,000 + Airport Elevation

Using an altimeter setting of 30.35 inHg, the calculation becomes:

Pressure Altitude = (29.92 inHg - 30.35 inHg) × 1,000 + 3,894 ft

= (-0.43 inHg) × 1,000 + 3,894 ft

= -430 ft + 3,894 ft

= 3,464 ft MSL

Next, you need to adjust for the temperature to find the density altitude. The standard temperature at sea