An aircraft flying IFR in unlimited visibility with total radio failure should do what?

• A. adopt a VFR flight level and continue flight onto destination
• B. land on the closest appropriate aerodrome, then advise Air Traffic Services of landing
• C. descend to En-route Minimum Safe Altitude and join closest airfield open to IFR operations
• D. continue flight onto destination, complying with last received clearances then with filed flight plan

Answer: (B)

When a flight is IFR and loses all radio communications, the immediate priority is to land as soon as practicable at the nearest suitable aerodrome where you can re-establish contact. Even in unlimited visibility, you still follow the lost-communications procedures: fly the last assigned route and altitude until you can safely land, but do not delay landing to continue to a destination you cannot communicate with.

The best choice matches this by directing you to land at the closest appropriate aerodrome and then inform Air Traffic Services of the landing. This satisfies the requirement to minimize risk by getting on the ground promptly and to notify ATC so they know your status.

Why the other options aren’t appropriate: continuing to the destination under VFR without addressing the comms failure isn’t allowed, since you must land as soon as practicable when you can’t communicate. The option mentioning descent to a minimum-safe altitude and joining a nearby airfield is not how lost-communications procedures are framed; MEA and “open to IFR operations” aren’t the guiding steps for a radio failure. Continuing to the destination under the last clearance ignores that you have no way to receive further instructions or assurances from ATC.