Final answer:
If you lose contact with Air Traffic Control, you should squawk 7600 on the transponder and follow the last assigned route and altitude. You should also adhere to procedures in the Aeronautical Information Manual, which include continuing via the route specified in your last clearance or your filed flight plan, and landing at your destination airport following standard lost communication procedures.
Step-by-step explanation:
If you lose contact with Air Traffic Control (ATC), it is important to remain calm and follow specified procedures. The correct response to the question is to squawk 7600 on the transponder. Squawking 7600 informs ATC that you have lost communication. In addition to setting the transponder, you should continue flying the last assigned route and altitude, if able, and follow the procedures published in the Aeronautical Information Manual (AIM) or your nation's equivalent aviation guide. These procedures typically include continuing via the route specified in your last clearance, proceeding to the route that you filed in your flight plan if no route was assigned, and if you’re unsure of the route, proceeding direct to the fix, route, or airway specified for your departure. Next, you should begin the approach at your destination airport as close as possible to your Estimated Time of Arrival (ETA) and maintain the last assigned altitude, unless below Minimum Enroute Altitude (MEA). If communication is not reestablished by the time you reach your destination airport, follow standard lost communication procedures for landing.