What is the purpose of the altitude indicator?

The altitude indicator, also known as an altimeter, serves the essential function of indicating the aircraft's altitude above sea level. This instrument provides critical information to pilots, enabling them to maintain safe and appropriate flight levels. By measuring atmospheric pressure changes as the aircraft ascends or descends, the altitude indicator translates this data into altitude readings.

Accurate altitude readings are crucial for compliance with air traffic regulations, avoiding terrain or obstacles, and ensuring safe separation from other aircraft. Monitoring altitude is vital for both navigation and safety during flight operations. Understanding this function helps pilots make informed decisions related to ascent, descent, and maintaining a desired flight level.