Tariq Malik of Space.com has updated the debate on Space Shuttle safety. The dissents of two key officials, accordingly to NASA, were based on the risk to the orbiter (that is, largely the risk that it could not reenter and would have to be abandoned in orbit) and not the risk to astronaut safety on launch.
Chief engineer Christopher Scolese and safety officer Bryan O'Connor, who both voted "no go" on the launch, now have said they did not think the Discovery STS-121 launch posed unacceptable risks to the astronauts. The 12-day ISS resuppply mission is scheduled for 1 July.
COMMENT: It still sounds like NASA is trying to spin a questionable decision: to override two "no go" votes in order to get flying again.
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