The amber CKPT ALT indicates that cockpit pressure altitude has exceeded what height?

The amber CKPT ALT indication alerts pilots that the cockpit pressure altitude has exceeded 19,000 feet. This threshold is significant because operating above this altitude requires additional considerations for pilot and passenger safety, including potential oxygen use due to reduced atmospheric pressure. The notification helps ensure that the crew can take appropriate actions, such as initiating oxygen protocols or adjusting cabin altitude, to maintain safety and comfort during flight. This altitude threshold is particularly important in terms of adherence to regulations and ensuring that the aircraft is equipped and operated within safe parameters.