NASA's Space Shuttle Discovery Arrives at Launch Pad

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Michael Rein
Kennedy Space Center, Fla.
(Phone: 321/867-2468)

RELEASE: 31-05


NASA's Space Shuttle Discovery arrived at its launch pad completing 
the next major milestone for Return to Flight of America's Space 
Shuttle program. The Shuttle arrived at its launch pad at 12:30 a.m. 
This was approximately three hours later than its scheduled arrival.

The slight delay was caused when Shuttle processing team members had 
to replace a Programmable Logic Controller (PLC) circuit card on the 
Crawler Transporter during the final leg of its journey. The Crawler 
Transporter is the vehicle which transports the Space Shuttle and its 
Mobile Launcher Platform to the launch pad. The PLC is an indicator 
that relays height measurements to the Crawler's operators while it's 
in motion.

The issue occurred during Discovery's initial attempt to climb the 
incline ramp leading to Pad 39B. When observed, technicians decided 
to stop the rollout and then reverse Discovery back down the incline 
ramp to level ground to test and then replace the circuit card. Once 
the new card was in place, the Crawler functioned normally and the 
rollout was completed. The Space Shuttle remained level and in a safe 
configuration throughout all movements and during the changeout of 
the card.

Once in place at the launch pad, the shuttle team continued 
preparation of Discovery for its scheduled launch set for a window of 
May 15 to June 3.


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