What will a pilot be expected to do when approaching a clearance limit after a radio failure in IFR conditions if no flight route has been assigned?

When a pilot experiences a radio failure while approaching a clearance limit during IFR (Instrument Flight Rules) conditions and has no flight route assigned, the appropriate action is to fly as filed in the flight plan. This response aligns with the procedures outlined in the Aeronautical Information Manual (AIM).

Specifically, if communication is lost and the pilot has a filed IFR flight plan, they may continue their flight along the route previously filed. This ensures that the aircraft remains on an intended course and altitude until reaching the clearance limit, following any routing that was previously approved by air traffic control (ATC).

Flying as filed allows the pilot to maintain safety and adherence to their planned route without needing to make abrupt changes that could increase the risk of navigational errors. It's also important to note that holding patterns, diversion to airports, or requests for assistance from nearby aircraft may not be necessary or advisable until further action is required after the clearance limit is reached.