Certified Flight Instructor - Flight Instructor Airplane Practice Exam

What does an increase in density altitude indicate for an aircraft’s performance?

1. Decreased climb performance.

2. Increased climb performance.

3. Increased fuel efficiency.

4. Better control effectiveness.

The correct answer is: Decreased climb performance.

An increase in density altitude signifies a decrease in the air density, which can adversely affect an aircraft's performance. Specifically, as density altitude rises, the air becomes less dense, leading to several performance limitations. The aircraft's engines produce less power, propellers are less effective, and the wings generate less lift compared to sea level conditions. These factors culminate in a reduced climb performance, meaning the aircraft will not be able to climb as efficiently or as quickly as it would at lower density altitudes. In contrast, lower density altitudes tend to enhance aircraft performance, allowing for improved climb rates and overall efficiency. Other options, such as increased fuel efficiency or better control effectiveness, do not accurately reflect the relationship between density altitude and aircraft performance. In summary, an increase in density altitude results in decreased climb performance, which is critical for pilots to understand for safe operation in various environmental conditions.