Operational Assessment of Apollo Lunar Surface Extravehicular Activity Timeline Execution

TitleOperational Assessment of Apollo Lunar Surface Extravehicular Activity Timeline Execution
Publication TypeConference Paper
Year of Publication2016
AuthorsMiller, M. J., A. Claybrook, S. Greenlund, and K. M. Feigh
Conference NameAIAA Space
Date Published09/2016

Quantitative assessment of the operational variability of Apollo lunar surface extravehicular activity (EVA) provides an opportunity to better understand the challenges involved in surface operations. This work extends previous EVA operational analyses by providing a more complete quantitative timeline execution assessment of Apollo lunar surface EVAs. Deviations between planned and as-performed timelines for each Apollo EVA were calculated and categorized by EVA task categories: 1) Overhead, 2) Station Activity, and 3) Traverse. Overall, Apollo lunar surface EVAs were performed while at a mean value of 10.8 minutes behind schedule (standard deviation 15.8 minutes). On a per task basis, the crew dedicated on average 20.5%, 43.6%, and 27.3% more time than had been planned to perform station activities, traversing, and overhead tasks, respectively. Summary statistics were calculated to describe the tendencies to repeatedly fall behind and get ahead of schedule throughout timeline execution. These insights provide methods and operational context for coping with the variability inherent to EVA execution for future concepts of operations.

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