originally had ejection seats (2) which were removed.Original TPS design (including unique features in the wing leading edge).Orbiter Experiments (OEX) recorder and associated Developmental Flight Instrumentation sensors.Scarred for Orbital Maneuvering System propellant kit pallet in payload bay.scarred for single EDO PRSD pallet in payload bay.It embarked on its first mission, STS-49, in May 1992 and its 25th and final mission, STS-134, in May 2011. scarred for Regenerative Carbon Dioxide Removal System (RCRS) Space Shuttle Endeavour (Orbiter Vehicle Designation: OV-105) is a retired orbiter from NASAs Space Shuttle program and the fifth and final operational Shuttle built.Extended Duration Orbiter (EDO) capable.O2 & H2 tank sets 4 and 5 shared a heater controller and switches O2 single heaters, H2 dual heaters.Electrical Power Reactants Supply and Distribution (PRSD) differences.Original wing carry-through structural design.Shuttle Infrared Leeside Temperature Sensing ( SILTS) pod on tip of vertical tail.All the Orbiters had minor external differences on top of the major ones: their names, locations of Thermal Protection System (TPS) repairs, differences in decals, wear and tear, etc. When writing this up I've tried ignore the temporal differences and to list the major differences that had an effect on operations.Īll the Orbiters had different things failed in them at various times that were not deemed worthy of fixing: gas flow sensors in the life support system, quantity probes in the propulsion system, etc, that led to operational differences I have not listed those. The Orbiters changed over time so that, for example, Columbia when it was destroyed was quite a bit different from when it was delivered. This would include things like unique equipment installed to facilitate certain missions (like the Atlantis example), but also structural differences that were a result from more advanced technologies or design applied to the newer orbiters (such as with Columbia, that had a heavier wing and fuselage spars). differences that affected their suitability for certain mission types. I'm interested to know what the major differences between all of the five flight-ready orbiters were, i.e. Atlantis was fitted with equipment for Mir missions.Columbia kept its internal air lock: this made it suitable for working Hubble service missions and launching the Chandra space telescope, but this plus other differences made it too heavy for ISS missions.As a consequence, they were not identical, making them (un)suitable for specific missions: Technology progressed during the 11 years between Columbia and Endeavour and the orbiters received various upgrades during service. Columbia was the first to fly, on Apand Endeavour the last one to have its maiden flight on May 7, 1992. There were six STS orbiter vehicles, of which five were operational for space flight:Ĭhallenger and Enterprise were used for tests, with Challenger later refitted for space flight.
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