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[i]An Unscheduled EVA results from unforeseen developments during a flight that lead to one or more EVAs being conducted for mission success. Since by definition, no procedures or timelines exist for any unscheduled EVA, this type is much more likely to require chamber or NBL runs. These would be used to verify procedures and timing before the EVA instructions were up-linked to the crew. Once the decision has been made to go EVA, an unscheduled EVA flight is supported exactly as a scheduled EVA flight. Contingency EVA is similar to an unscheduled EVA flight in that it results from problems that occur during a flight. The difference is that the problems that could lead to such an EVA have been foreseen and detailed procedures already exist. Examples would be EVAs required to close a malfunctioning payload bay door or to jettison the Ku-Band antenna. All crews are trained in such contingency procedures in the NBL. Two EMUs and associated hardware and expendables sufficient to accomplish three two-man EVAs are manifested for all non-EVA flights for such contingencies. This is a Level II requirement that is imposed by NSTS 07700, Volume X. As with an unscheduled EVA, once the decision has been made by the Flight Director to go EVA, a contingency EVA flight is supported exactly as a scheduled EVA flight.[/i]
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