Why the Endeavour's final mission launch was delayed

STS-134 Post Launch Scrub News Conference · 38:21 · Video: NASA · Watch at the source

In short: A technical malfunction with the auxiliary power unit heaters forced a scrub of the STS-134 mission. This news conference details the immediate response and the path toward the shuttle's final flight to the International Space Station.

Following a launch scrub at NASA's Kennedy Space Center in Florida, officials addressed an issue involving the heaters for the auxiliary power units (APU). The mission, STS-134, represents the final flight for the space shuttle Endeavour and is destined for the International Space Station.

A subsequent takeoff window opened no before 2:33 p.m. this Monday, EDT, subject to findings from Saturday's evaluation. NASA's launch team planned to meet over the weekend to evaluate accumulated data and determine the next steps for the mission.

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