![]() If successful, the new power transfersystem will allow the STS-118 astronauts to conserve Endeavour's own fuel cellsupplies. The system then converts thatpower to feed the orbiter's 28-volt system. ![]() The shuttleis NASA's first to carry a Station-Shuttle Power Transfer System (SSPTS), whichis designed to allow Endeavour to siphon electrical power from the station's120-volt grid via a docking port connection. Standingout among Endeavour's nearly 200 modifications is a trio of systems makingtheir first operational appearance on a NASA shuttle flight. Commanded by veteran astronaut Scott Kelly, the mission also features thefirst flight of teacher-turned-spaceflyerBarbara Morgan, who served as McAuliffe's backup in 1986. The shuttle rolled out of its then-Rockwell International(now Boeing) hangar in Palmdale, California in 1991 to join NASA's orbiter fleet.Įndeavouris now poised to make its 20 th launch into space on NASA's STS-118 missionto deliver cargo, spare parts and a new piece of starboard-side framework tothe ISS. Endeavour,also known as Orbiter Vehicle-105 (OV-105), is NASA's youngest space shuttleand was commissioned in 1987 as a replacement for its sister ship Challenger following the loss ofthat older orbiter, its six-astronaut crew and Teacher in Space ChristaMcAuliffe in January 1986. ![]()
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