The memo was meant to jolt Morton Thiokol, the company that made the boosters and employed Mr. Boisjoly. In July 1985, a task force had been formed, partly on Mr. Boisjoly’s recommendation, to examine the effect of cold on the boosters. The effort, however, had become mired in paperwork, procurement delays and a rush to launch the shuttle, according to later investigations.
Meanwhile, his apprehensions only grew. The night before the Challenger’s liftoff, the temperature dipped below freezing. Unusual for Florida, the cold was unprecedented for a shuttle launching, and it prompted Mr. Boisjoly and other engineers to plead that the flight be postponed. Their bosses, under pressure from NASA, rejected the advice.
The shuttle exploded 73 seconds after launching, killing its seven crew members, including Christa McAuliffe, a high school teacher from Concord, N.H.
Mr. Boisjoly’s memo was soon made public. He became widely known as a whistle-blower in a federal investigation of the disaster. And though he was hailed for his action by many, he was also made to suffer for it.
Mr. Boisjoly (pronounced like Beaujolais wine) died in Nephi, Utah, near Provo, on Jan. 6. He was 73. His death was reported only locally at the time. He lived in southwest Utah, in St. George. His wife, Roberta, said he recently learned he had cancer in his colon, kidneys and liver.
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