A helicopter intends to take-off with a northeasterly heading, experiencing a reported steady wind from 045°/12 kt. What headwind should be taking into account for performance purposes?
A northeasterly take-off heading is equal to 045°.
The angle difference between the take-off heading and the wind direction is 0°, so the wind from 045°/12 kt is wholly headwind.
But, according to the CAT.POL.H.105 - General:
- 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.
Thus, the wind that should be taken into account for performance purposes is 045°/6 kt.
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