What is the density altitude for the following conditions: Altimeter setting 30.35, Runway temperature +25°F, Airport elevation 3,894 ft MSL?

To determine the density altitude, you must first understand how to calculate pressure altitude and then adjust for temperature effects.

Pressure altitude is found by setting the altimeter to standard pressure, which is 29.92 inches of mercury (inHg), and then using the airport elevation. The base elevation of the airport is 3,894 feet. Since the altimeter setting is 30.35 inHg, we can find the pressure altitude using the following formula:

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

Plugging in the values:

• Airport Elevation: 3,894 ft

• Standard Pressure: 29.92 inHg

• Altimeter Setting: 30.35 inHg

Calculating the difference:

29.92 - 30.35 = -0.43 inHg

Now converting that difference into feet:

-0.43 inHg × 1,000 ft = -430 ft

Adding this to the airport elevation:

3,894 ft - 430 ft = 3,464 ft (approximately)

Next, we need to adjust for temperature. The runway temperature is +25°F, which is significantly warmer than the standard temperature