KSC-2011-2659

CAPE CANAVERAL, Fla. -- During a simulated launch countdown, STS-134 Pilot Greg H. Johnson checks the fit of his helmet in the Operations and Checkout Building at NASA's Kennedy Space Center in Florida. Next, Johnson and his crewmates will walk out to the waiting Astrovan. As part of the Terminal Countdown Demonstration Test (TCDT), the crew members will ride to the pad in their silver Astrovan and strap into space shuttle Endeavour to practice the steps that will be taken on launch day. Endeavour's six crew members are targeted to launch April 19 at 7:48 p.m. EDT. They will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett