Which code is used for lost communications situations according to ICAO?

The code used for lost communications situations according to the International Civil Aviation Organization (ICAO) is 7600. This code specifically indicates that an aircraft is experiencing a communication failure, which informs air traffic control and other relevant entities that the pilot cannot establish or maintain communication with air traffic services. This allows for appropriate measures to be taken for the safety and management of the aircraft during such situations.

In aviation, different codes are used to represent various emergency and navigational situations. The code 7700 signifies an emergency situation, while 1200 is the transponder code used for VFR (Visual Flight Rules) flight in the United States. The code 1400 is not a standard emergency or communication code recognized for the context of lost communications. Thus, understanding the specific role of 7600 is crucial for pilots and air traffic controllers in ensuring safety during communication failures.