Shuttle Components. Chronology of the Related Events. 1974NASA contracts Morton Thiokol1976 NASA accepts the design based on the Titan missilesThe joints are sealed by Two synthetic rubber O-rings, 177 clevis pins, Heat shield putty. The Cause of the Disaster. Early Problems. 1977Tests at Thiokol show O-ring leakageJoint is made stronger by changing sizes1981Post-launch investigation showed O-ring erosion due to hot gages..
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