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Full Transcript (below)
4. Q: Please tell us about the various Shuttle heat shield repair kits, and what you found out testing these kits and materials.?
Balboni: Over the last 12 months we've screened concepts for repair to the RCC leading edge system on the Shuttle, and these repairs would have to be done on orbit by an astronaut in a suit. There were three main repair types. Ah, there was a patch. There was a plug, and also a crack repair. I'll start with the crack repair. It was a material that was very putty-like. As a matter of fact, it is a material that is very putty-like, and it would be applied either by kind of like a trowel or even through a gun – literally an injection, injecting the, ah, the crack repair material into a crack. And the crack could be small, of the order of ah the size of your fingernail, or it could be large, maybe ah as long as maybe a foot. And ah, that material then is tested in our Arc Jet Facility under a simulated reentry, which exposes it to the superheated gas that the Shuttle sees during its reentry. And it evaluates then this material that's applied on top, and that's actually been a very successful repair that's probably gonna be flying on the next couple of flights. (1:16 MINUTES)