Man who warned of Challenger disaster dies at 73

Associated Press Modified: February 7, 2012 at 4:30 pm •  Published: February 7, 2012

NEPHI, Utah (AP) — Roger Boisjoly, a NASA contractor who repeatedly voiced concerns about the space shuttle Challenger before it exploded, has died. He was 73.

Boisjoly died of cancer on Jan. 6 in Nephi, about 40 miles south of Provo, his wife Roberta Boisjoly said.

The 1986 Challenger tragedy shocked the nation. Seven astronauts, including a schoolteacher, were killed when the shuttle disintegrated 73 seconds after liftoff from Cape Canaveral, Fla.

Boisjoly, an engineer at rocket-builder Morton Thiokol Inc., warned in 1985 that seals on the booster rocket joints could fail in freezing temperatures.

"The result would be a catastrophe of the highest order — loss of human life," he wrote in a memo.

On the eve of the ill-fated flight, Boisjoly and several colleagues reiterated their concerns and argued against launching because of predicted cold weather at the Kennedy Space Center. They were overruled by Morton Thiokol managers, who gave NASA the green light.

Slow-motion video of the launch showed a tongue of flame sprouting from one of the shuttle's solid rocket boosters, licking the main fuel tank.

After the accident, Boisjoly testified to a presidential commission investigating the Challenger accident. The group determined that hot gases leaked through a joint in one of the booster rockets shortly after blastoff that ended with the explosion of the shuttle's hydrogen fuel.

Boisjoly said he was shunned by colleagues and neighbors after emerging as a whistleblower. He took an extended leave of absence while Morton Thiokol worked on a redesign of the rocket joint.