sbcanada
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(CNN) -- NASA technicians detected a crack in the main propulsion system on the space shuttle Columbia this week, similar to those found on two of its sister ships.
The discovery of tiny fissures near the liquid hydrogen and oxygen lines on the shuttles Atlantis and Discovery prompted shuttle managers last week to ground the entire fleet indefinitely.
The decision put a damper on the space agency's ambitious shuttle launch plan.
Three shuttle flights were planned for the remainder of the year, including a 16-day science mission on Columbia, which was to begin in mid-July.
At NASA's Kennedy Space Center in Florida, shuttle workers removed Columbia's engine and will continue searching for additional cracks this week.
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