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Accession Number N20120014465
Title STS-133/ET-137 Tanking Test Photogrammetry Assessment.
Publication Date Apr 2012
Media Count 24p
Personal Author S. T. Oliver
Abstract Following the launch scrub of Space Shuttle mission STS-133 on November 5, 2010, an anomalous condition of cracked and raised thermal protection system (TPS) foam was observed on the External Tank (ET). Subsequent dissection of the affected TPS region revealed cracks in the feet of two Intertank (IT) metallic stringers. An extensive investigation into the cause(s) and corrective action(s) for the cracked stringers was initiated, involving a wide array of material and structural tests and nondestructive evaluations, with the intent to culminate into the development of flight rational. One such structural test was the instrumented tanking test performed on December 17, 2010. The tanking test incorporated two three-dimensional optical displacement measurement systems to measure full-field outer surface displacements of the TPS surrounding the affected region that contained the stringer cracks. The results showed that the radial displacement and rotation of the liquid oxygen (LO2) tank flange changed significantly as the fluid level of the LO2 approached and passed the LO2 tank flange.
Keywords Discovery(Orbiter)
External tanks
Imaging techniques
Liquid hydrogen
Liquid oxygen
Space shuttle missions
Technology assessment
Thermal protection

Source Agency National Aeronautics and Space Administration
NTIS Subject Category 50 - Civil Engineering
48I - Cartography
84C - Manned Spacecraft
Corporate Author National Aeronautics and Space Administration, Huntsville, AL. George C. Marshall Space Flight Center.
Document Type Conference proceedings
Title Note N/A
NTIS Issue Number 1307
Contract Number N/A

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