Fatigue — Crew member responsibilities
107.—(1)  A person must not act as a crew member for any flight mentioned in regulation 3(1)(a) or (b), if the person knows or suspects that the person is suffering from or, having regard to the circumstances of the flight to be undertaken, is likely to suffer from such fatigue as may endanger the safety of the aircraft or its occupants.
(2)  A person must not act as a flight crew member for any flight mentioned in regulation 3(1)(a) or (b) if, at the beginning of the flight (other than a private flight of an aircraft with an MCTOM not exceeding 1,600 kg), the aggregate of the person’s previous and planned flight times as a flight crew member —
(a)exceeds 100 hours during the 28‑day period immediately preceding the day on which the flight begins; or
(b)exceeds 1,000 hours during the 12‑month period immediately preceding the day on which the flight begins.