5.—(1) Subject to regulations 23(2) and 44, no person may carry out an operation specified in regulation 6 except under and to the extent authorised by a certificate registered with the competent authority or a temporary certificate.
(2) No person may carry out an operation specified in regulation 6 under a temporary certificate unless that person works in the presence, and under the direct supervision of, a person who holds a certificate registered with the competent authority in relation to that operation.