6. Requirement for licence, rating or authorisation
A person shall not act as a pilot, a flight engineer, an aviation maintenance technician or an air traffic controller of a civil aircraft unless that person is the holder of a valid licence, rating or authorization for that purpose issued or validated by—
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(a) the Authority in accordance with these Regulations; or
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(b) the State in which the aircraft is registered;
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and any conditions subject to which the licence, rating or authorization was issued or rendered valid are complied with.