154.—(1) This article applies to United Kingdom airship, balloon and gyroplane licences.
(2) Subject to paragraphs (3), the holder of such a pilot licence is not entitled to exercise the privileges of an aircraft rating specified in Chapter 1 of Part 2 of Schedule 8 which is included in the licence on a flight unless—
(a)the licence has a certificate of revalidation for the rating;
(b)the certificate is appropriate to the functions to be performed on that flight in accordance with Chapter 1 of Part 3 of Schedule 8; and
(c)the certificate is issued and valid in accordance with Chapter 1 of Part 3 of Schedule 8.
(3) The holder of a United Kingdom Private Pilot's Licence (Balloons and Airships) is entitled to exercise the privileges of an aircraft rating specified in Chapter 1 of Part 2 of Schedule 8 which is included in the licence on a flight if the licence does not have a certificate referred to in paragraph (2).