(a) Each helicopter deck must be—
(1) At least the size of the rotor diameter of the largest single main rotor helicopter that will be used on the facility; or
(2) If tandem main rotor helicopters use the facility, at least of a size to provide a longitudinal axis of 9⁄10 the overall length of the helicopter, and a width of 3⁄4 of the overall length of the helicopter.
Note: For the purpose of paragraph (a)(2) the overall length is measured across both main rotors in the fore and aft line.
(b) Each helicopter deck must be located so as to provide clear approach/departure paths to enable the largest helicopter using the facility to operate in all weather conditions which allow helicopter operations.
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