What is the role of the altimeter in an aircraft?

The altimeter plays a crucial role in an aircraft by indicating the altitude of the aircraft relative to sea level. It does this by measuring the atmospheric pressure outside the aircraft; as altitude increases, the pressure decreases. This information is vital for pilots to maintain safe flight levels, ensure proper separation from terrain and other aircraft, and comply with air traffic control instructions.

Monitoring altitude is essential for various phases of flight, such as takeoff, cruising, and landing, to prevent altitude-related accidents. Accurate altitude readings help ensure that the aircraft adheres to the requisite minimums for safety and optimizes its performance during different phases of flight. Understanding and utilizing the altimeter effectively is fundamental to the safe operation of any aircraft.