28.—(1) This article applies to any United Kingdom licence for which there is no JAR-FCL equivalent other than a United Kingdom Basic Commercial Pilot's Licence and a United Kingdom Flight Engineer's Licence.
(2) Subject to paragraphs (3) and (4), the holder of a pilot's licence to which this article applies shall not be entitled to exercise the privileges of an aircraft rating contained in the licence on a flight unless the licence bears a valid certificate of test or a valid certificate of experience in respect of the rating, which certificate shall in either case be appropriate to the functions he is to perform on that flight in accordance with Section 1 of Part C of Schedule 8 and shall otherwise comply with that Section.
(3) The holder of a Private Pilot's Licence (Balloons and Airships) to which this article applies shall be entitled to exercise the privileges of an aircraft rating contained in the licence on a flight when the licence does not bear a certificate referred to in paragraph (2).
(4) The holder of a Microlight Licence, an SLMG Licence or a United Kingdom Private Pilot's Licence (Gyroplanes) shall not be entitled to exercise the privileges of an aircraft rating contained in the licence on a flight unless the certificate of test or certificate of experience required by paragraph (2) is included in the personal flying log book required to be kept by him under article 35.
(5) The holder of a flight navigator's licence to which this article applies shall not be entitled to perform functions on a flight to which article 25(9) applies unless the licence bears a valid certificate of experience which certificate shall be appropriate to the functions he is to perform on that flight in accordance with Section 1 of Part C of the said Schedule and shall otherwise comply with that Part.