A single aircraft known as Westland WS-70L List of Operators of Sikorsky S-70A-19 Black Hawk From Organisation with model S-70A-19 Black Hawk 1974 Sikorsky Helicopters S-70 H-60 1974/ Construction Numbers on database of S-70A-19 Black Hawk 1s-70a-19 Construction Numbers Help Us C/NYearHistory 70-1058 1 C/N.