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1.0 INTRODUCTION This final edition of the Lunar Surface Operations Plan defines equipment requirements, crew/equipment interfaces, and final flight planning and crew activities for lunar surface EVA operations during the first manned lunar landing mission. This plan delineates how the lunar surface operational and scientific objectives for the first manned lunar landing mission will be accomplished through pre-mission timelining and procedures definition. Although the primary concern of this plan is the lunar surface EVA operational aspects of the mission, interface relationships are presented to provide clarity and continuity to the overall mission plan. The nominal plan is for a single two-man lunar excursion. The planned duration will be two hours and forty minutes or upon reaching a pre-determined red line on one of the PLSS consum- abIes. The red line is defined as having either a 30 minute supply of oxygen or a 30 minute supply of feedwater remaining after repressurization. The battery is not considered to be a constraint on the lunar surface time for this mission. Based on an estimation of each crewman's BTU expenditure to accomplish his respective EVA tasks, a PLSS expendable red line should not be reached during the EVA. The Commander is expected to expend approximately 3625 BTU's which will leave a 1175 BTU PLSS reserve or approximately 50 minutes Lunar surface time. (Metabolic profiles are presented in the Appendix, Section 5.4) In addition to the nominal timeline, the plan presents three other timelines for the lunar EVA. One timeline is referred to as an alternate timeline and two are referred to as contingent timelines. These timelines differ from the nominal primarily by additions or deletions of tasks. The major difference in the alternate timeline, from the nominal, is the addition of the S-band erectable antenna deployment which reduces the time available for the documented sample collection. The first contingent timeline, Contingent EVA 1, is a presentation of activities for a minimum-time, one-man EVA. The second contingent timeline, Contingent EVA 2, is for a one-man, two-hour EVA. 1