Why have different casualty probability numbers been given?
At the press conference Dr. Weiler stated the risk, after the failure of another gyroscope, as 1 in 1000. This is the risk for an uncontrolled reentry. However, NASA engineers have a plan for a controlled reentry even if all of the gyroscopes fail. Dr. Weiler confirmed the risk from this option as 1 in 4.1 million. We do not know why NASA has focused on the 1 in 1000 risk when a much safer alternative has been developed.
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- Why have different casualty probability numbers been given?
