If the aircraft's radio fails, what should be the recommended procedure when landing at a controlled airport?

The recommended procedure when landing at a controlled airport with a radio failure involves observing the traffic flow, entering the pattern, and looking for a light signal from the tower. This approach is essential because the pilot needs to ensure they are following the correct traffic pattern while also signaling their intentions to air traffic control in a manner that can be perceived visually.

By observing the traffic flow, the pilot can identify how other aircraft are maneuvering and ensure they enter the pattern safely and at the appropriate altitude, especially in a high-traffic environment. Entering the pattern before seeking a light signal helps maintain order and reduces the risk of confusion between multiple aircraft.

After entering the traffic pattern, the pilot should look for light signals from the tower, which can provide guidance on how to proceed. Light signals can include instructions to land or go around, allowing the pilot to make decisions based on the tower's visual communications.

This procedure is crucial for maintaining safety and coordination in controlled airspace, particularly when the radio communication, which is typically the primary method of coordination, is unavailable.