Which interphone message has the highest priority?

The interphone message classified as an emergency message has the highest priority because it involves critical situations that could pose immediate threats to the safety of passengers, crew, or the aircraft itself. Emergency messages are designed to provide urgent communication necessary for making quick decisions and implementing safety protocols.

Such messages may convey information about in-flight emergencies, technical malfunctions, or other situations where timely and effective communication can directly affect the outcome of a crisis. In contrast, routine messages, directive messages, and information messages serve different purposes, such as sharing general information or directives that are not time-sensitive and do not require immediate action. Prioritizing emergency messages ensures that they are addressed promptly, which is crucial in maintaining safety during flight operations.