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Blast-off on fatal mission
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Ron Dittemore, NASA's space shuttle programme
manager, confirmed the insulation came off the fuel tanks at
liftoff on January 16 and banged into the spacecraft's left wing.
He said it was judged by ground controllers not to have damaged
the orbiter's critical heat shield.
But on Saturday, after the Columbia had reentered the earth's
atmosphere to head home, sensors in the left wing began to fail,
indicating excessive heat was seeping into the shuttle
structure.
NASA lost contact with the shuttle at around 1400 BST while it
was almost 40 miles above Earth.
"The first indications of a potential problem .... were of the
loss of sensors, temperature sensors in the hydraulic systems on the
left," Dittemore said at Johnson Space Centre.
"They were followed seconds and minutes later by several other
problems, including loss of tire pressure indications on the left
main gear," he
added. |