(WASHINGTON) -- Following reports that a third air traffic controller was caught sleeping on the job, the chief operating officer of the Air Traffic Organization announced Thursday he was resigning from his position.
Randy Babbitt, administrator of the Federal Aviation Administration, accepted Hank Krakowski's resignation and said David Grizzle, the FAA's chief counsel, will step in temporarily to fill the spot.
Babbitt added that a nationwide search will be conducted to appoint a new, permanent COO for the ATO, which is responsible for operating the country's air traffic control system.
The resignation comes amid news that an air traffic controller reportedly nodded off Wednesday morning while a plane carrying a critically ill patient was trying to land at the Reno-Tahoe International Airport in Nevada. The controller, who was out of communication for approximately 16 minutes, was suspended while the Federal Aviation Administration investigates the incident.
The latest incident marks the third time in less than two months that an air traffic controller has been caught sleeping on the job.
Last month at Washington, D.C.'s Reagan National Airport, a controller on his fourth consecutive overnight shift left the radio tower silent after apparently falling asleep. Two commercial airliners were forced to land on their own.
In February, a controller in Knoxville, Tennessee went to sleep on the job during a midnight shift. Sources told ABC News that the controller made a bed on the floor of the control tower with couch pillows.
In response to Wednesday's incident, the FAA and the Department of Transportation announced that additional air traffic controllers would be immediately added on the midnight shift at 27 control towers that currently have only one person working overnights -- including Reno.
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