(1)Notwithstanding anything to the contrary contained in any provision of this Act, regulations or rules made thereunder or in the terms and conditions contained in any licence, certificate, permit, authorization or approval granted or issued under this Act, the Director General, in his capacity as the designated Government Agent in Sri Lanka responsible for national civil aviation security, shall have the power to cancel with immediate effect any such licence, certificate, permit, authorization or approval granted or issued, whether the same has been granted or issued by himself or the Authority, as the case may be, where he has sufficient reason to believe that the holder of such licence, certificate, permit, authorization or approval, as the case may be, poses a threat to the national security or to the national defence of Sri Lanka or where he was sufficient reason to suspect that the holder of such licence, certificate, permit, authorization or approval is likely to pose a threat to the national security or to the national defence of Sri Lanka.