What procedures should be followed in a lost communications scenario?

In a lost communications scenario, the best procedure to follow is to use the chronological order of assigned, vectored, expected, and filed clearances. This method provides a clear and systematic approach to resolving a situation where communications with air traffic control (ATC) have been lost.

When a pilot loses communication, the priority is to adhere to the last known clearance received. By following the prescribed order, the pilot will first utilize any specific instructions or headings that were last assigned by ATC. If those instructions are not applicable anymore because of the situation, the pilot would then proceed to any headings or routes that were vectored. If no relevant instructions are available, the pilot would move on to the expected clearance which is usually an anticipated instruction provided by ATC prior to the loss of communication. Finally, in the absence of all preceding instructions, the pilot would follow their filed flight plan.

This sequential approach ensures that the pilot remains compliant with air traffic protocols and minimizes the chances of conflicting with other air traffic, thereby enhancing safety. Other strategies may not provide a clear pathway to safely navigate the aircraft or could result in unsafe maneuvers or situations.