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Current OMS Fuel Propellant Loading Strategy • • NSTS 21075 Space Shuttle Operational Flight Design Level B Standard Groundrules and Constraints govern the flight design OMS load determination process based on mission requirements Ascent/Entry Flight Techniques reviewed and updated the default “full” OMS load in mid 2004 to preclude a bad OMS load when loading via GSE – The “full” OMS load target was changed to the OMRSD max load that could be achieved if loading via GSE flowmeters – OMRSD Max Load is 7703.5 lbm Oxidizer and 4685.5 lbm Fuel (per side) – This change minimized impacts of a potentially poor propellant load to final real-time propellant margins • Based on recent COPV work, it has been determined that the 2004 propellant load was not optimized for the OMS Mixture Ratio – An additional 35.5 lbm of OMS Fuel per side is loaded on missions utilizing this default full OMS load – Equates to a 66 lb APM improvement that could be realized immediately for many flights February 15, 2007 PRCB S063534 COPV DA/Lenort, Stich, Gabriel;
International Journal of Advances in Engineering &
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