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ATC procedural error

The 737’s flight data record had been inhibited on the controllers’ displays for a total of 27 minutes, which was equivalent to a flight distance of about 222nm (411 km). During this period, none of the controllers involved were aware of the aircraft’s presence in their respective airspace. There was a loss of separation assurance. The ATSB has examined the recorded radar data and found no separation conflicts in the affected airspace during that time.