What does a cabin altitude warning indicate?

A cabin altitude warning indicates that the cabin altitude has exceeded a safe threshold, which is crucial for passenger and crew safety. This warning is often triggered when the pressure in the cabin drops to levels that can affect the physiology of those on board, potentially leading to hypoxia or other altitude-related issues if not addressed promptly. The aircraft is designed to maintain a cabin altitude that simulates a low altitude environment for comfort and health. When this warning occurs, it serves as a critical alert for the crew to take necessary actions to restore normal cabin pressure, such as using oxygen masks or descending to a lower altitude. This is essential for ensuring the well-being of everyone in the aircraft during flight operations.