What is the function of the altimeter in an aircraft?

• A. To measure altitude
• B. To monitor airspeed
• C. To calculate fuel efficiency
• D. To determine wind speed

Answer: (A)

The altimeter's primary function is to measure altitude, which is the distance of the aircraft above a reference surface, typically sea level. It operates based on changes in atmospheric pressure. As an aircraft ascends, the atmospheric pressure decreases; conversely, it increases as the aircraft descends. The altimeter translates these pressure changes into altitude readings, allowing pilots to understand their elevation during flight.

This measurement is crucial for safe navigation, air traffic control, and compliance with altitude regulations. By providing accurate altitude readings, the altimeter helps prevent mid-air collisions and ensures that the aircraft remains at a safe height above terrain and obstacles. In summary, the altimeter's role in determining altitude is vital for the overall safety and efficiency of flight operations.