Report of the PRESIDENTIAL COMMISSION on the Space Shuttle Challenger Accident

This briefing chart is the earliest known indication that the joint design was unacceptable. Leon Ray, in a 1977 briefing on a planned Structural Test Article test indicates that no changing the design is unacceptable since the tang can move outboard and cause excessive joint clearance resulting in seal leakage.

This briefing chart is the earliest known indication that the joint design was unacceptable. Leon Ray, in a 1977 briefing on a planned Structural Test Article test indicates that no changing the design is unacceptable since the tang can move outboard and cause excessive joint clearance resulting in seal leakage.

- Back -