At a pressure altitude of 5,000 feet and a temperature of +40C, what is the approximate density altitude?

To determine the density altitude, it is essential to consider both the pressure altitude and the temperature deviation from standard ISA (International Standard Atmosphere) conditions. At a pressure altitude of 5,000 feet, the standard temperature is approximately +5°C. Given that the actual temperature is +40°C, it is significantly warmer than standard.

Start by calculating the deviation from standard temperature using the formula for the temperature at pressure altitude:

1. Calculate the temperature deviation:

• Standard temperature at 5,000 feet = +5°C

• Actual temperature = +40°C

• Deviation = +40°C - +5°C = +35°C

2. Use the temperature deviation to find the density altitude. The formula to determine density altitude is:

• Density Altitude = Pressure Altitude + (120 x (Actual Temperature - Standard Temperature))

3. Plugging in the values:

• Density Altitude = 5,000 feet + (120 x 35)

• Density Altitude = 5,000 feet + 4,200 feet

• Density Altitude = 9,200 feet

However, estimating calculations can yield variations, so a common approximated answer for background knowledge suggests that a