2.2.1.1 Sufficient data on the performance of the aeroplane
shall be determined and scheduled in the aeroplane flight
manual to provide operators with the necessary information for
the purpose of determining the total mass of the aeroplane on
the basis of the values, peculiar to the proposed flight, of the
relevant operational parameters, in order that the flight may
be made with reasonable assurance that a safe minimum
performance for that flight will be achieved.