any modifications to the orbiter were completed in the OPF.the Orbital Maneuvering System and Reaction Control System pods were possibly removed and transferred to the Hypergol Maintenance Facility for troubleshooting, repair or other services.any needed repairs on the orbiter's thermal protection system including the thermal blankets and thousands of tiles were completed.main engines were removed and transferred to the Main Engine Processing Facility for checkout and service.scaffolding was installed around the orbiters aft to allow technicians to access the main engines.main engines were locked in place and covers installed.heat shields were removed from the engines and aft access were opened.refuse and other waste products including draining of the potable water system were offloaded What is Kennedy’s Orbiter Processing Facility Who is NASA flow director Hosted by Damon Talley of NASAs Digital Learning Network, the webcast takes you behind the scenes at Kennedy Space Center in Florida and includes an interview with Flow Director Ken Tenbusch, who oversees the critical work to prepare shuttle Endeavour for flight.high-pressure gases were vented from the environmental control and life support systems.The oxygen system was rendered inert with gaseous nitrogen and the hydrogen system with gaseous helium. fuel cell tanks were drained of remaining cryogenic reactants.payload bay doors were opened and any hazardous payloads were processed for safety.The orbiter's main engines were purged to remove the moisture that was a by-product of liquid oxygen and liquid hydrogen combustion.Any remaining payloads from the previous mission were removed and the vehicle was fully inspected, tested, and refurbished. When a Shuttle mission was completed, the orbiter was towed from the Shuttle Landing Facility to its assigned OPF where it spent several months (typically less than 100 days) being prepared for the next mission.
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