Answer :
The density altitude will be approximately 9040 feet at an airport with an elevation of 7000 feet, a temperature of 18°C, and a pressure altitude of 7000 feet.
To calculate the density altitude at an airport 7000 feet above sea level with a temperature of 18°C and a pressure altitude of 7000 feet, we can use the following formula:
Density Altitude = Pressure Altitude + [120 × (OAT - ISA Temperature)]
Where:
Pressure Altitude (PA) = 7000 feet
Outside Air Temperature (OAT) = 18°C
ISA Temperature at 7000 feet = 1°C (standard temperature decreases by about 2°C per 1000 feet of altitude above sea level)
Plugging in the values:
Density Altitude = 7000 + [120 × (18 - 1)]
= 7000 + [120 × 17]
= 7000 + 2040
= 9040 feet
