Private Pilot Private Exam

What factor would tend to increase the density altitude at a given airport?

1. An increase in ambient temperature

2. A decrease in pressure

3. A decrease in humidity

4. An increase in altitude

The correct answer is: An increase in ambient temperature

Increasing ambient temperature raises the density altitude at a given airport because it causes the air to expand. Warmer air has lower density compared to colder air at the same altitude; thus, as temperature rises, the air becomes less dense. Density altitude is a measure that indicates the air density in relation to standard atmospheric conditions and is crucial for pilots to understand because it affects aircraft performance. When density altitude increases due to higher temperatures, it results in reduced aircraft performance, longer takeoff distances, decreased climb rates, and reduced engine efficiency. This concept is essential for pilots as they must account for these variations to ensure safe operation of the aircraft, particularly during takeoff and landing phases. Ultimately, understanding how temperature affects density altitude is vital for flight planning and ensuring that the aircraft can operate safely in varying atmospheric conditions.