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CAPE CANAVERAL, Fla. -- Heather Hinkel, principal investigator for the Sensor Test for Orion Relnav Risk Mitigation, or STORRM, Project at NASA's Johnson Space Center, provides an overview of the flight test that space shuttle Endeavour will perform on the last on-orbit day of the STS-134 mission. The overview took place at NASA's Kennedy Space Center in Florida where Endeavour is awaiting liftoff. During the mission, Endeavour will fly a dedicated maneuver to simulate an Orion rendezvous trajectory, while two Orion sensors collect visual- and laser-based relative navigation data. This will provide an unprecedented in-flight test opportunity for America's next-generation exploration spacecraft. STS-134 also will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the space station. Endeavour was scheduled to launch at 3:47 p.m. on April 29, but that attempt was scrubbed for at least 72 hours while engineers assess an issue associated with the shuttle's Auxiliary Power Unit 1. STS-134 will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts134_index.html. Photo credit: NASA_Jack Pfaller