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SRB Hold-Down Post Frangible Nut

Mission: STS-31 Discovery   Crew: Loren J. Shriver
Charles F. Bolden, Jr.
Steven A. Hawley
Bruce McCandless II
Kathryn D. Sullivan
Launch: April 24, 1990  
Landing: April 29, 1990  
Duration: 5 days, 1 hours  
Comment: Deployed the Hubble Space Telescope

This half of a hold-down post frangible nut was recovered on April 24, 1990, after it rode with one of the Solid Rocket Boosters (SRB) launching the Hubble Space Telescope on Discovery. Each SRB has four hold-down posts that hold it and the launch platform's posts together. Each bolt has a nut at each end but only the top one is frangible. It has two detonators, which are ignited at solid rocket motor ignition commands. When the detonators go off, the nut halves are caught in a blast container.

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