repairapp
DESCRIPTION
The cure-in-place ablator is delivered into the repair cavity by means of a pneumatically controlled hand-held applicator, or “goo-gun”. After injecting the cure-in-place ablator into the damaged tile, the surface of the repair must be smoothed using special foam covered tools. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: repairapp](https://reader036.vdocument.in/reader036/viewer/2022062422/568134af550346895d9bc778/html5/thumbnails/1.jpg)
The cure-in-place ablator is delivered into the repair cavity by means of a pneumatically controlled hand-held applicator, or “goo-gun”.
![Page 2: repairapp](https://reader036.vdocument.in/reader036/viewer/2022062422/568134af550346895d9bc778/html5/thumbnails/2.jpg)
After injecting the cure-in-place ablator into the damaged tile, the surface of the repair must be smoothed using special foam covered tools.
![Page 3: repairapp](https://reader036.vdocument.in/reader036/viewer/2022062422/568134af550346895d9bc778/html5/thumbnails/3.jpg)
One method of manipulating the repair surface is to use small foam covered rollers to flatten protuberances in the material.
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A foam covered “stamp” or flat trowel is used in large damage cavities to flatten peaks and high spots on the surface of the repair.
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Astronaut Scott Parazynski injects the cure-in-place ablator into the cavity and uses a smaller, angled tool to flatten the repair surface.
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Astronaut David Wolf uses a large adjustable foam covered roller to smooth the surface of a membrane covered cavity.
![Page 7: repairapp](https://reader036.vdocument.in/reader036/viewer/2022062422/568134af550346895d9bc778/html5/thumbnails/7.jpg)
Wide Lexan trowels can also be used to smooth the surface of a membrane covered repair without getting ablator on the tools or suit.
![Page 8: repairapp](https://reader036.vdocument.in/reader036/viewer/2022062422/568134af550346895d9bc778/html5/thumbnails/8.jpg)
The repair must be checked using a “step gage” to insure that it does not protrude more than 0.25 inches past the orbiter outer mold line (OML).
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In instances where a slight overfill if the cavity may be called for, a special foam covered trowel is used to verify that the ablator is just above the OML
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It may be necessary to remove excess material from a membrane covered cavity. This can be done using a large flat trowel.
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It is important to insure that there are no protuberances on the repair surface that may disrupt the aerodynamic flow over the cavity. This excess material may be removed using a tool similar to a putty knife.
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Astronaut Carlos Noriega injects material to a special clear damage mold to observe flow characteristics of the material in zero-gravity.