If the wind below 1,000 feet mean sea level (MSL) exceeds 90 degrees, and deviates in excess of 45 degrees from the long axis of the landing site, the land heading should be adjusted or an aircraft advisory issued. The allowable wind velocity decreases as the density altitude increases» Because of the design of the helicopter, it can only accept a minimum velocity of wind from certain directions.
a. Aircraft can land with a tail wind of 0 to 5 knots.
b. Aircraft can land -with a cross wind of 0 to 9 knots.
c. Aircraft can land with a head wind of 10 knot% and above
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