(1)Air traffic service units shall be equipped with clocks indicating the time in hours, minutes and seconds.(2)Clocks and other time recording devices shall be checked periodically to ensure correctness of time to within plus or minus thirty seconds of coordinated universal time.(3)Wherever data link communications are utilised by an air traffic services unit, clocks and other time-recording devices shall be checked periodically to ensure correctness of time within one second of coordinated universal time.(4)The correct time shall be obtained from a standard time station, or if not possible, from another unit which has obtained time from such station.
