Radio issue? Ok. I suppose we will be able to tell from the CVR what actually happened, but it's pretty dangerous do be incommunicado at that point in a flight.
http://avherald.com/h?article=4b016414&opt=0
The FAA later reported that tower cleared the Air Canada A320 to land when it was about 6nm out, but once he recognized that the runway might not be clear he instructed the A320 to go around for six times. When the aircraft did not respond tower also used the light gun showing red to alert the crew to go around, however, the aircraft continued to land. The runway happened to be clear by the time the A320 touched down. The crew subsequently told tower they had a radio problem. The FAA have opened an investigation into the occurrence.
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