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The lowermost arm, located 147 feet above the pad surface, the orbiter access arm allowed personnel -- including 53 astronaut crews -- to enter the shuttle's crew cabin.
The outer end of the access arm features an environmental chamber or "white room" that mates with the orbiter and holds six people.
The arm remained in the extended position until seven minutes, 24 seconds before launch to serve as an emergency escape route for the flight crew. It is 65 feet long, 5 feet wide, and 8 feet high, and could be mechanically or manually repositioned in about 15 seconds in the event it was needed.
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