Fuelling operations
45.—(1)  A relevant operator must ensure that the aircraft is not refuelled or defuelled when any passenger is embarking, disembarking or on board the aircraft.
(2)  A relevant operator must ensure that a helicopter is not refuelled or defuelled when a helicopter rotor is turning.
(3)  Paragraphs (1) and (2) do not apply when —
(a)the aircraft being refuelled or defuelled is properly attended to by the pilot‑in‑command or other qualified personnel, who is ready to initiate and direct an evacuation of the aircraft in the most practical and expeditious means available; and
(b)the relevant operator has ensured that two‑way communications is maintained, by the aircraft’s intercommunications system or other suitable means, between the ground crew supervising the refuelling or defueling and the qualified personnel mentioned in sub‑paragraph (a).
(4)  A relevant operator must ensure that appropriate precautions are taken —
(a)when refuelling an aircraft with a fuel other than aviation kerosene;
(b)when refuelling an aircraft results in a mixture of aviation kerosene with other aviation turbine fuels; or
(c)when an open line is used.