The authorisation shall remain valid subject to:
the third country operator remaining in compliance with the relevant requirements of Part-TCO. The provisions related to the handling of findings, as specified under TCO.325, shall also be taken into account;
the validity of the AOC or equivalent document issued by the State of the operator and the related operations specifications, if applicable;
the [F1CAA] being granted access to the third country operator as specified in TCO.115;
the third country operator not being subject to an operating ban [F2under any relevant enactment];
the authorisation not being surrendered, suspended or revoked;
the third country operator having carried out at least one flight every 24 calendar months, into, within or out of the [F3United Kingdom] under the authorisation.
Upon surrender or revocation, the authorisation shall be returned to the [F4CAA].