A request for information (RFI) from industry on how to human-rate commercial spacecraft designed to take government astronauts to the International Space Station offers considerable latitude for “tailoring” safety requirements to the new approach envisioned in NASA’s Fiscal 2011 budget request. Released May 21, the Commercial Crew Transportation RFI sets a basic requirement that human spacecraft be “two-failure-tolerant to catastrophic events,” but offers a long list of revisions to ...


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