Flight times – responsibilities of flight crew
84 (1) Subject to paragraph (2), a person shall not act as a member of the flight crew of an aircraft registered in the United Kingdom if at the beginning of the flight the aggregate of all his previous flight times:
(a) during the period of 28 consecutive days expiring at the end of the day on which the flight begins exceeds 100 hours; or
(b) during the period of twelve months expiring at the end of the previous month exceeds 900 hours.
(2) This article shall not apply to a flight which is:
(a) A private flight in an aircraft of which the maximum total weight does not exceed 1600 kg;