The operator shall ensure that-
(a) the mass of the helicopter, at the start of the take-off, is not greater than the mass at which the requirements prescribed in the appropriate Division can be complied with for the flight to be undertaken, allowing for expected reductions in mass as the flight proceeds; and
(b) the approved performance data contained in the aircraft flight manual referred to in Regulation 91.03.2, is used to determine compliance in the appropriate Division.