WEBVTT

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This is Shuttle Launch Control, where we see from the astronaut quarters our STS-115 crew leaving the

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suit-up room and heading for the elevator to take them down to the first floor and the awaiting Astrovan.

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We should be able to follow them on the way out to the pad with the security helicopter from above

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and as they pass some critical milestones, once they reach the Vehicle Assembly Building. And there they go.

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We're at T-2 hours, 41 minutes, 35 seconds and counting as the Astrovan continues toward the launch pad.

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Meanwhile, the primary ascent guidance data is now being transferred to the backup flight system.

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The orbiter's onboard computers can be updated with the proper ascent profile,

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depending on the upper-level wind situation at the time of the launch.

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These profiles are called "eye-loads" and they tell the vehicle what the angle of

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attack should be at various times and speeds during the ascent.

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Members of the pad crew greeting the STS-115 astronauts.

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Some of the crew will wait out on the orbiter access arm while the first one or two go in and begin to don their helmets.

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