Article 37 Use of flight recording systems and preservation of records
On any flight on which a flight data recorder or a cockpit voice recorder is required by sub-paragraph 4(4) or (5) of Schedule 4 to this Order to be carried in an aeroplane, it shall always be in use from the beginning of the take-off run to the end of the landing run.
The operator of the aeroplane shall at all times, subject to the provisions of Article 61 of this Order, preserve—
the last 25 hours of recording made by any flight data recorder required by or under this Order to be carried in an aeroplane; and
a record of not less than one representative flight, that it to say, a recording of a flight made within the last twelve months which includes a take-off, climb, cruise, descent, approach to landing and landing, together with a means of identifying the record with the flight to which it relates;
and shall preserve such records for such period as the Governor may in a particular case direct.
On any flight on which a cockpit voice recorder is required by paragraph 4(10)(c) of Schedule 4 of this Order to be carried in a helicopter, it shall always be in use from the time the rotors first turn for the purpose of taking off until the rotors are next stopped.