13.—(1) The Authority may cancel or suspend any certificate of competency if the holder is suffering from a disease or disability which, in the opinion of the Authority, makes him incapable of discharging his ordinary duties as a radio operator adequately.
(2) The Authority shall not cancel or suspend any certificate of competency until the radio operator concerned has been notified in writing to appear before the Authority to show cause why his certificate should not be cancelled or suspended.
(3) The certificate of competency of a radio operator who appears to show cause is to be suspended until the decision of the Authority has been made known.
(4) Where the radio operator fails to appear before the Authority, the Authority is to forthwith cancel his registration.