Composition of cabin crew
137.—(1)  Unless otherwise authorised by the Director-General of Civil Aviation, an AOC holder must not carry any passengers on a relevant aircraft unless the number of cabin crew members on board is not less than the higher of either —
(a)the number of cabin crew members specified in the aircraft manufacturer’s recommended emergency evacuation procedures for the aircraft configuration being used; and
(b)the number of cabin crew members specified in the certified design criteria for the aircraft.
(2)  An AOC holder must ensure that a person is not assigned as a cabin crew member for any flight of a relevant aircraft unless the person —
(a)is at least 18 years of age;
(b)is medically fit to discharge the duties specified in the Operations Manual; and
(c)meets the competency requirements in Division 10.
(3)  Despite paragraph (1), if it appears to be expedient to do so in the interests of safety, the Director‑General of Civil Aviation may direct an AOC holder not to fly a relevant aircraft, or any such aircraft in such circumstances as the Director‑General of Civil Aviation may specify, unless that aircraft carries such additional persons as cabin crew members as the Director‑General of Civil Aviation may specify in the direction.