• The optional work, called Milestone 15a, had Sierra Nevada show that Dream Chaser’s reaction control system can operate in a vacuum chamber characterized by some of the conditions found in space. The system is supposed to help Dream Chaser maneuver in orbit, and also guide it to landings on runways.
  • Sierra Nevada and NASA agreed to the optional milestone in 2013 under the company’s existing Commercial Crew Integrated Capability (CCiCap) contract. The company now has achieved all but one of the 13 miletones outlined in the contract.

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