Technicians on Kennedy's Launch Pad 39A wrap up pressurization of space shuttle Endeavour's Orbital Maneuvering System, Reaction Control System, Main Propulsion System and shuttle main engines today. These various propulsion systems are pressurized using helium and nitrogen gases. Techs also continue closing out work in Endeavour's aft section for its upcoming launch at 3:47 p.m. EDT April 29.
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