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National Aeronautics and Space Administration Lyndon B. Johnson Space Center Houston, Texas 77058 AC 713 483-5111

Rh Jeffrey E. Carr Release No. 90-024

Due to a change in the Terminal Countdown Demonstration Test, the STS-31 briefings and crew press conference have been postponed to Thursday, March 22.

T-0 for the TCDT, originally set for Thursday, was moved to Tuesday because of a revision in launch pad activities at the Kennedy Space Center. TCDT is the crew's traditional dress rehearsal for launch day.

The briefings, originating at the Johnson Space Center, will begin at 8:30 a.m. CST, Thursday, with a briefing by Flight Director Bill Reeves. A briefing regarding the secondary payloads and the student experiment is set for 9:30 a.m., followed by the crew press conference at 10:30 a.m.

All briefings will be carried on NASA Select.