Sikorsky will start flying the prototype S-76D medium helicopter with composite main rotor blades within days, marking the resumption of full flight tests that are to include three aircraft by early June. The blades form a key element of the upgraded design that will also include a new tail rotor, more powerful Pratt & Whitney Canada PW210S engines, a Thales-developed integrated avionics cockpit, active vibration control and an advanced health and usage monitoring system (HUMS). ...

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