What is the purpose of the "ALT" alert system in modern aircraft?

The "ALT" alert system in modern aircraft serves the critical function of warning pilots about altitude deviations. This is particularly important for maintaining safe flight operations, as strict adherence to assigned altitudes is essential for avoiding terrain, other aircraft, and ensuring compliance with air traffic control directives.

When the aircraft deviates from its assigned altitude, the alert system activates to draw the pilot's attention to the situation, prompting corrective action. Maintaining altitude is vital for safety and operational efficiency, and the "ALT" alert system plays an essential role in helping pilots manage this aspect of flight. The other options, while related to important aircraft systems, do not pertain specifically to altitude monitoring and alerting.