Nasa chiefs ‘repeatedly ignored’ safety warnings
“Fears of a catastrophic shuttle accident were raised last summer with the White House by a former Nasa engineer who pleaded for a presidential order to halt all further shuttle flights until safety issues had been addressed.
In a letter to the White House, Don Nelson, who served with Nasa for 36 years until he retired in 1999, wrote to President George W. Bush warning that his ‘intervention’ was necessary to ‘prevent another catastrophic space shuttle accident’.”