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… : the provision by an air traffic control unit or flight service station of aeronautical safety information, including … control centre established to provide air traffic control service to IFR aircraft (ii) a terminal control unit established to provide air traffic control service to IFR aircraft while they are being operated within …
90.566
… 1. Time The 24 hour system will be used and will be expressed in … The digits 2359 or 0001 will be used to express the time at midnight. 2. Watches Every conductor, assistant … in a 24 hour period; (ii) set it to reflect the correct time if it reflects a variation of more than 30 seconds; …
90.216