Keystone Helicopter provides helicopter maintenance and engineering services such as airframe maintenance, avionics integration, component repair, engine maintenance and overhaul, fabrication and machining, interior cabin finishing, and painting. The subsidiary of helicopter manufacturer Sikorsky Aircraft, has begun making Sikorsky's legendary S-76 commercial helicopters. Besides its parent, other customers include AgustaWestland and Bell Helicopter Textron. Keystone Helicopter, which does all of its manufacturing from a 250,000 sq. ft. facility in Pennsylvania, was founded by former Navy pilot Peter Wright in 1953.