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Testing is also complete on window impact from debris, including butcher paper, ablator material, foam, Tyvek, aluminum oxide, and small/fast ogive foam. NASA's debris transport analysis suggests that very small ogive foam has the potential to impact the Orbiter windows, but impact tolerance tests indicate that the windows can withstand these impacts without sustaining critical damage. Testing also indicated that butcher paper -- used to cover the forward reaction control system thrusters at the launch pad -- caused unacceptable damage to the windows. [b]As a result, NASA replaced butcher paper covers with Tyvek covers (similar to what large FedEx envelopes are made of) that will not cause critical damage.[/b]
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