137.—(1) Subject to articles 139 to 147, a person must not act as a member of the flight crew of an aircraft to which this paragraph applies without holding an appropriate licence granted or rendered valid under this Order.
(2) Paragraph (1) applies to any non-EASA aircraft registered in the United Kingdom other than such an aircraft that is referred to in paragraphs (a)(ii), (d) or (h) of Annex II of the Basic EASA Regulation and that is flying for the purpose of commercial air transport (an “excepted aircraft”).
(3) A person must not act as a member of the flight crew of an excepted aircraft unless—
(a)the person acts as a flight radiotelephony operator, flight engineer or flight navigator and holds an appropriate licence granted or rendered valid under this Order; or
(b)the person holds an appropriate licence granted, converted or rendered valid under the EASA Aircrew Regulation.