The accident has not compromised Discovery's February 24 mission to the International Space Station (ISS), said Allard Beutel, spokesman at the Kennedy Space Center in Florida.

A feeler gauge -- a 13-part metal tool about as thick as a piece of paper held together by a retainer screw -- came apart late Wednesday and fell from the launch pad, Beutel told AFP.

The accident took place as technicians changed a seal at the ground umbilical carrier plate, or GUCP, on the shuttle's external fuel tank.

"Engineers have identified minor foam damage to the backside of the external tank, which will not need repair. All components from the gauge have been located," NASA said in a statement.

The mission will get a green light and a launch time after NASA officials meet on February 18.

The shuttle was initially set to launch on November 5 but the attempt was scrubbed after hydrogen leaks were detected.

Discovery's 11-day mission with its all-American crew of six is to deliver a pressurized logistics module called "Leonardo" to the International Space Station, which will be permanently attached to the space station to provide more storage space.

The three US shuttles -- the other two are Atlantis and Endeavour -- are due to become museum pieces once the final shuttle mission takes place.

Endeavour is set for takeoff on April 19 and Atlantis is scheduled for June 28, after which the famed fleet will be retired.

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