MPTA Main Engines
MPTA may refer to: * MPTA — ''Main Propulsion Test Article'' – part of the US Space Shuttle programme, see Orbiter Vehicle Designation ** MPTA-098 (formerly ''MPTA'') ** MPTA-ET * Michigan Public Transit Association * Minnesota Public Television Association The Minnesota Public Television Association (MPTA), also commonly known as Minnesota Public Television, is a not-for-profit trade organization of public television stations in the state of Minnesota that operates an interconnecting statewide educa ...

Orbiter Vehicle Designation
The Space Shuttle orbiter is the spaceplane component of the Space Shuttle, a partially reusable orbital spacecraft system that was part of the discontinued Space Shuttle program. Operated from 1977 to 2011 by NASA, the U.S. space agency, this vehicle could carry astronauts and payloads into low Earth orbit, perform in-space operations, then re-enter the atmosphere and land as a glider, returning its crew and any on-board payload to the Earth. Six orbiters were built for flight: ''Enterprise'', '' Columbia'', ''Challenger'', ''Discovery'', ''Atlantis'', and '' Endeavour''. All were built in Palmdale, California, by the Pittsburgh, Pennsylvania-based Rockwell International company. The first orbiter, ''Enterprise'', made its maiden flight in 1977. An unpowered glider, it was carried by a modified Boeing 747 airliner called the Shuttle Carrier Aircraft and released for a series of atmospheric test flights and landings. ''Enterprise'' was partially disassembled and retired after ...
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MPTA-098
The Main Propulsion Test Article (MPTA-098) was built by Rockwell International as a testbed for the definitive propulsion and fuel delivery systems for the U.S. Space Shuttle Program. Description Never intended for actual spaceflight, the MPTA consisted of the internal structure of a Space Shuttle orbiter aft-fuselage, a truss structure that simulated the basic structure and shape of an orbiter mid-fuselage and a complete Space Shuttle Main Engine (SSME) assembly, including all main propulsion system plumbing and the associated electrical systems. Later, the very different STA (Structural Test Article) was converted into a flightworthy orbiter, re-designated OV-099, and christened ''Challenger''. Rockwell and NASA thus retroactively re-designated the MPTA as MPTA-098, though it was never christened with a name. A Space Shuttle External Tank, commonly referred to as MPTA-ET, was built to be used in conjunction with MPTA-098 for structural tests of the Space Shuttle Main Engi ...
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MPTA-ET
The Main Propulsion Test Article (MPTA-098) was built by Rockwell International as a testbed for the definitive propulsion and fuel delivery systems for the U.S. Space Shuttle Program. Description Never intended for actual spaceflight, the MPTA consisted of the internal structure of a Space Shuttle orbiter aft-fuselage, a truss structure that simulated the basic structure and shape of an orbiter mid-fuselage and a complete Space Shuttle Main Engine (SSME) assembly, including all main propulsion system plumbing and the associated electrical systems. Later, the very different STA (Structural Test Article) was converted into a flightworthy orbiter, re-designated OV-099, and christened ''Challenger''. Rockwell and NASA thus retroactively re-designated the MPTA as MPTA-098, though it was never christened with a name. A Space Shuttle External Tank, commonly referred to as MPTA-ET, was built to be used in conjunction with MPTA-098 for structural tests of the Space Shuttle Main Engi ...
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Michigan Public Transit Association
{{More citations needed, date=October 2007 The Michigan Public Transit Association (MPTA) is a non-profit statewide association incorporated in 1977 under Section 501(c)6 of the Internal Revenue Code. First organized in 1974, the membership ranges from the largest urban public transit system providers in Michigan to a majority of the smaller rural demand-response systems. Geographically, MPTA membership is distributed throughout the state, from southeast Michigan to the westernmost point of the Upper Peninsula. MPTA offices have been located in East Lansing since October, 1999, close to Michigan State University and nearby the State Capitol. Much of MPTA's advocacy involves working closely with Michigan's Executive and Legislative branches and the Michigan Department of Transportation The Michigan Department of Transportation (MDOT) is a constitutional government principal department of the US state of Michigan. The primary purpose of MDOT is to maintain the Michigan State Tr ...
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