I'm on my phone, so can't post the link, but Scott Manley has a decent explanation regarding this.
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I'm on my phone, so can't post the link, but Scott Manley has a decent explanation regarding this.
The NASA Commercial Crew Program (CCP) human-rating standards require that the probability of a loss on ascent is no more than 1 in 500, and that the probability of a loss on descent is no more than 1 in 500. The overall mission loss risk, which includes vehicle risk from micrometeorites and orbital debris while in orbit for up to 210 days, is required to be no more than 1 in 270.