NASA Photo ID: 108-KSC-81PC-19 Space Shuttle prime crew astronaut Commander John Young, along with other astronauts and ground support personnel, were briefed on the use of the emergency pad escape system known as the "slidewire." The slidewire system provides a quick and sure escape from upper launch pad platforms in case of a serious emergency. The flight crews wore the spacesuits and other equipment to be worn during a mission, but sandbags were used to duplicate the weight of the riders in the slidewire baskets during the training at Launch Complex 39A.
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