Sikorsky’s S-76D intermediate-size helicopter is wrapping up certification flight testing after an eleventh-hour delay caused by cracking of mounts attaching the engines to the airframe. The S-76D is the latest evolution of the 12/13-seat commercial helicopter, with an integrated flightdeck, active vibration control, rotor ice protection and composite rotor blades driven by more-powerful Pratt & Whitney Canada PW210S turboshafts. “We hoped to be certified about now, but we were ...

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