If the aircraft’s radio fails, what is the recommended procedure when landing at a controlled airport?

If Air Traffic Control advises that radar service is terminated when the pilot is departing Class C airspace, the transponder should be set to code

What action, if any, is appropriate if the pilot deviates from an ATC instruction during an emergency and is given priority?

When an ATC clearance has been obtained, no pilot in command may deviate from that clearance, unless that pilot obtains an amended clearance. The one exception to this regulation is