Flight deck compartment
19.—(1)  An AOC holder must ensure that every person present in the flight deck of a large aeroplane that is in flight is an assigned flight crew member.
(2)  Despite paragraph (1), the pilot‑in‑command of a large aeroplane may permit the following persons to be admitted to or be carried in the flight deck compartment, or occupy a pilot seat, when the aeroplane is in flight:
(a)an authorised representative of the Authority;
(b)a person permitted by the AOC holder in accordance with procedures specified in its Operations Manual.
(3)  An AOC holder must ensure that any person permitted to be admitted to or carried in the flight deck pursuant to paragraph (2) is familiarised with the appropriate safety procedures, as specified in its Operations Manual.