STRATFORD, Conn., May 1 (UPI) -- Full system testing of the CH-53K heavy-lift helicopter being developed for the U.S. Marine Corps has begun, Sikorsky Aircraft said Thursday.
The testing involves a non-flying prototype with all seven main rotor blades and four tail rotor blades attached and spinning, the start of a two-year test program of the rotor blades, transmission, engines, and all sub-systems on the ground test vehicle.