Sikorsky’s Keystone subsidiary will take over final assembly and completion of the S-76C++ and subsequent variants of the twin-turbine helicopter, including the S-76D, at its Coatesville, Pa. “heliplex.”  Mick Maurer, Sikorsky’s v-p for operations, said the company relocated the S-76 to make room for increased production of the Black Hawk at the company’s main plant in Stratford, Conn., beginning next year.