e. Passive Docking - The POTV shall be capable of passive docking at the geostationary station for 90 days. f. Propellant Loading - Propellant loading at the geostationary station, using propellant previously delivered by cargo OTV, shall be considered. Performance Requirements a. Payload Requirements - The POTV shall be capable of transporting a crew of three and (TBD) passengers and/or high priority cargo of TBD kgs and TBD nr from the low Earth orbit staging point to the geostationary location and return to the low Earth orbit point of origin or to the launch site. External payload mounting provisions for maximum capability deployed payload weight. b. Guidance and Navigation Accuracies - The POTV shall be capable of guidance and navigation accuracy consistent with placing its payload at the geostationary location within limits (TBD). The return to low Earth orbit option accuracy shall be (TBD). The POTV return to launch site option accuracy shall be (TBD). Rendezvous capability shall be per MSFC tug (cryo) specifications. c. The nominal transfer time shall be not greater than 12 hours. d. Structural Requirements - The POTV structure shall be compatible with the launch loads associated with the HLLV and/or Shuttle and reentry loads associated with the return to launch site option. e. Habitability Requirements - The POTV shall provide a habitable crew compartment and provisions for a transfer time of 12 hours and a contingency time of up to 36 hours. The nominal stay time shall be less than 18 hours. f. OMS Capability - The POTV shall provide OMS capability at GEO of 500 ft/sec beyond primary maneuver and nominal rendezvous requirements. 3. Options 3.1 Heavy Lift Launch Vehicle (HLLV) Eleven configurations were identified as candidates to serve the HLLV purpose. A number of these were two-staged winged vehicles utilizing hydrogen/oxygen propellants for the upper stage and either hydrogen/oxygen or hydrocarbon/oxygen propellants for a boost vehicle.
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