156.—(1) The holder of a United Kingdom licence is not entitled to exercise the privileges of a certificate or rating specified in paragraph (2) unless—
(a)the licence in which the certificate or rating is included has a certificate of revalidation; and
(b)the certificate of revalidation is appropriate, issued and valid in accordance with Chapter 1 or 2 of Part 3 of Schedule 8.
(2) The certificates and ratings referred to in paragraph (1) are—
(a)an instrument meteorological conditions rating (aeroplanes);
(b)an instrument rating (aeroplane);
(c)an instrument rating (helicopter); and
(d)any instructor certificate.