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NASA says bolt poses threat to shuttles

Posted on: Saturday, 14 June 2003, 06:00 CDT

WASHINGTON (AP) - The newly discovered problem needs to be corrected before the shuttle fleet is cleared to fly again, an official says.

Investigators have found a new threat to future space shuttles a 40-pound bolt fragment that could fly off during launch and smash into the spacecraft, with catastrophic results, as it races toward orbit.

Members of the investigation board that is searching for the cause of Columbia's destruction said yesterday that they found radar evidence that a piece of a 2-foot-long bolt that joins the solid- rocket boosters to the shuttle's external fuel tank may have flown loose during the launch.

There is no evidence that the bolt fragment hit Columbia, but Air Force Maj. Gen. John Barry, a member of the board, said, "It has the potential to be catastrophic in the future."

Barry said the discovery does not change the board's working scenario that Columbia was fatally damaged by a chunk of foam insulation that peeled off the fuel tank and smashed into the craft's left wing during launch, damaging the heat shield. It's thought that superheated gases entered the hollow wing and melted it from the inside during re-entry on Feb. 1. Columbia broke apart, killing seven astronauts.

Barry said that while investigating the role that the external tank may have played in Columbia's destruction, engineers looked at launch radar records of the craft and spotted an image of an object near the shuttle just moments after the solid rocket boosters were ejected from the external tank.

Investigators determined that the image could be a fragment of the heavy bolt that somehow was thrown free during booster separation. The bolts are normally exploded to free the solid rockets. Fragments of the bolts are supposed to be captured by a cylinder called a bolt catcher.

Tests with equipment like that used on Columbia showed that "the bolt catcher is not as robust as it should be," said retired Navy Adm. Hal Gehman, the board chairman.

In the tests, Barry said, the top of the bolt catcher came apart. If this happened during launch, a 40-pound chunk of the bolt would have been ejected and could have slammed into the space shuttle. He said the problem needs to be corrected before the space shuttle fleet is cleared to fly again.

The bolts attach the 150-foot-tall solid rocket boosters to either side of the shuttle's external fuel tank.

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