According to CAT.POL.H.105 - General:
When showing compliance, the operator must ensure that the mass of the helicopter never exceeds any limits at any stage, including in-flight re-planning and account shall be taken of the following parameters:
(1) mass of the helicopter;
(2) the helicopter configuration;
(3) the environmental conditions, in particular:
(i) pressure altitude and temperature;
(ii) wind:
(A) for take-off, take-off flight path and landing requirements, accountability for wind shall be no more than 50% of any reported steady headwind component of 5 kt or more;
(B) where take-off and landing with a tailwind component is permitted in the AFM, and in all cases for the take-off flight path, not less than 150 % of any reported tailwind component shall be taken into account;
(4) the operating techniques; and
(5) the operation of any systems that have an adverse effect on performance.
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