Extravehicular Activity and Human Surface Mobility Program (EHP): Integrated Concept of Operations (ConOps)

This Extravehicular Activity and Human Surface Mobility Program (EHP) Concept of Operations (ConOps) document captures a high-level definition of the prospective concepts of operations, capabilities, and operational interfaces across the current National Aeronautics and Space Administration (NASA) exploration mission architecture options reflecting stakeholder expectations. EHP operations involve conducting Extravehicular Activities (EVAs) using the Exploration EVA (xEVA) System in both microgravity environments (such as cis-lunar space aboard Gateway) and partial gravity on the lunar surface. These operations also include traversing the lunar terrain using both the unpressurized Lunar Terrain Vehicle (LTV) and the Pressurized Rover (PR). Science activities conducted on these rovers will be opportunistic—meaning they will be supported by basic onboard capabilities, with scientific tasks designed to fit within the vehicles' operational parameters. EHP operations also encompass activities involving a secondary habitable volume, such as the Initial Surface Habitat (ISH), expected to be the Multi-Purpose Habitat (MPH), as well as interactions with the Lunar Surface Cargo Lander. Operations with other pre-formulation projects, will be included in upcoming revisions of this document as will operations during transit to Mars and Mars surface .