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Activities
escalate and the launch team's focus intensifies -- only one hour
to go before liftoff!
The
orbiter's onboard computers are transitioned to launch configuration.
This includes:
Data
processing system engineer confirmation that the onboard computers
have been transitioned to the Terminal Countdown configuration.
Primary
Ascent Software is loaded into the orbiter's computers and Atlantis'
Commander Jeff Ashby configures the backup Flight System software
to a matching profile.
Verification
that a dump of the orbiter's general purpose computer memory has
been completed.
A
purge of the three fuel cells is underway....
Pilot
Pamela Melroy is also busy during this period accomplishing the
following tasks:
Configuring
cockpit displays for launch.
Performing
the Main Propulsion System Helium System reconfiguration.
This activity ensures that helium isolation valves necessary
for in-flight engine purges function properly and provide an
emergency source of pressure for pneumatic shutdown of the engines.
Coordinates
with Orbiter Test Conductor, Rudy Tench, to ensure proper Reaction
Control System propellant tank levels. This is required
as part of checklist activities necessary to verify the appropriate
configuration of cross-feed valves between the Orbital Maneuvering
System and the Reaction Control System propellant tanks.
A
gaseous nitrogen purge of the Orbiter's aft skirts is completed.
This flow of inert gas ensures that no explosive or flammable
gases accumulate in the bottom of the Solid Rocket Boosters prior
to launch.
All
nonessential personnel are cleared from the launch danger area.
Final
verification is received that all emergency aircraft and contingency
support personnel are on station.
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Atlantis
(0V-104) is named after a two-masted sailing ship that was operated
for the Woods Hole Oceanographic Institute (WHOI) from 1931 to
1964. The orbiter was delivered to Kennedy Space Center in April
1985 and lifted off on its maiden voyage on October 3, 1985, on
mission 51-J.