Preparations are under way at the device to resume mating operations of space shuttle Discovery to a Shuttle Carrier Aircraft.

Before daybreak at the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida, preparations are under way at the mate-demate device to resume mating operations of space shuttle Discovery to a Shuttle Carrier Aircraft. A tail cone covers Discovery’s three replica shuttle main engines to reduce aerodynamic drag and turbulence during the ferry flight.

The device, known as the MDD, is a large gantry-like steel structure used to hoist a shuttle off the ground and position it onto the back of the aircraft, or SCA. The SCA is a Boeing 747 jet, originally manufactured for commercial use, which was modified by NASA to transport the shuttles between destinations on Earth. The SCA designated NASA 905 is assigned to the remaining ferry missions, delivering the shuttles to their permanent public display sites. NASA 905 is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on the SCA, visit http://www.nasa.gov/centers/dryden/news/FactSheets/FS-013-DFRC.html. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Dimitri Gerondidakis