EU Introduces Squawk 7601 for IFR Flights Losing Comms in VMC

European airspace has introduced a new transponder code to improve safety during radio communication loss. Under EU Regulation IR SERA 2024/404, effective May 1, 2025, pilots must squawk Mode A Code 7601 when an IFR flight encounters visual meteorological conditions and the pilot-in-command decides to divert to a nearby aerodrome.

This new code distinguishes diverting flights from those continuing under standard lost communications procedures using squawk 7600. The updated regulation extends the holding pattern duration from seven to 20 minutes at the last assigned level before further actions are required for IFR flights. Emergency descent procedures now grant pilots discretion to navigate as deemed appropriate, removing mandatory off-route turns during emergencies.

While the European Union implemented these rules across its member states, some neighboring regions have opted out. Switzerland confirmed it will not implement 7601, and the United Kingdom maintains no changes to its radio communication failure procedures. Aviation authorities say the change enhances situational awareness by clarifying whether a pilot intends to land or continue flying IFR. The rules supersede outdated Aeronautical Information Publications, with most updates reflected in the May 15 AIRAC cycle.