Descripción : KSC post stamp. During the ascent phase, 73 seconds after liftoff, the vehicle experienced a catastrophic structural failure resulting in the loss of crew and vehicle. The Rogers Commission later determined the cause of the accident to have been the failure of the primary and secondary (backup) O-ring seals on Challenger‍ `​s right Solid Rocket Booster. The failure of these seals allowed a flamethrower-like flare to impinge upon one of two aft SRB attach struts, which eventually failed, freeing the booster to pivot about its remaining attachment points.

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STS 51 L (CHALLENGER) · TDRS 2 (SATELLITE) · ALL SEVEN ASTRONAUTS KILLED · DISASTER