LOUISVILLE, Colo. — Sierra Nevada Corporation (SNC) Space Systems has successfully completed a preliminary design review (PDR) of the design, architecture and performance of its Dream Chaser orbital crew vehicle. This marks a new milestone in the company’s effort to develop transportation for astronauts to low Earth orbit and the International Space Station.SNC is one of several companies working to develop commercial crew transportation capabilities under the Commercial Crew Development Round 2 (CCDev2) agreement with NASA’s Commercial Crew Program (CCP). The goal is to help spur innovation and development of new spacecraft and launch vehicles from the commercial industry to develop safe, reliable and cost-effective capabilities to transport astronauts to low Earth orbit and the space station. The Dream Chaser is designed to carry as many as seven astronauts to space. It is the only spacecraft under CCDev2 that uses wings and is designed to land on a conventional runway.”As CCP’s partners meet these critical milestones, we are moving in the right direction in our combined effort to advance commercial capabilities that could eventually transport NASA astronauts,” NASA CCP Program Manager Ed Mango said.