Washington (CNN) -- A second air traffic controller has been found to have fallen asleep on the job, this one intentionally sleeping for five hours while a fellow controller, working alone, landed seven aircraft, the Federal Aviation Administration said Wednesday.

The FAA is taking steps to fire the controller, the agency said.

The incident occurred at McGhee Tyson Airport in Knoxville, Tennessee, on February 19. A controller on duty in the radar room went to sleep during his midnight shift. A fellow controller, working in a different room, handled both the radar and tower positions while the other controller "was unresponsive," the FAA said.