weaker and less flexible" than the test section from Enterprise, this result suggested that the RCC would have been shattered. A section of RCC leading edge from Discovery was tested on June 6, to determine the effects of the foam on a similarly aged leading edge, resulting in a crack on panel 6 and cracking on a "T"-shaped seal between panels 6 and 7. On July 7, using a leading edge from Atlantis and focused on panel 8 with refined parameters stemming from the Columbia accident investigation, a second test created a ragged hole approximately in the RCC structure. The tests clearly demonstrated that a foam impact of the type Columbia sustained could seriously breach the protective RCC panels on the wing leading edge. The board determined that the probable cause of the accident was that the foam impact caused a breach of a reinforced carbon-carbon panel along the leading edge of Columbia left wing, allowing hot gases generated during re-entry to enter the wing and cause structural collapse. This caused Columbia to tumble out of control, breaking up with the loss of the entire crew. Museum exhibit Washington, D.C. From 1985 to 2003, Enterprise was stored at the Smithsonian's hangar at Washington Dulles International Airport before it was restored and moved to the Smithsonian's newly built National Air and Space Museum Steven F. Udvar-Hazy Center at Washington Dulles, where it was the centerpiece of the space collection. On April 12, 2011, NASA announced that , the most traveled orbiter in the fleet, would replace Enterprise in the Smithsonian's collection once the Shuttle fleet was retired, with ownership of Enterprise transferred to the Intrepid Sea, Air & Space Museum in New York City. On April 17, 2012, Discovery was transported by Shuttle Carrier Aircraft to Dulles from Kennedy Space Center, where it made several passes over the Washington D.C. metro area. After Discovery had been removed from the Shuttle Carrier Aircraft, both orbiters were displayed nose-to-nose outside the Steven F. Udvar-Hazy Center before Enterprise was made ready for its flight to New York. New York On December 12, 2011, ownership of Enterprise was officially transferred to the Intrepid Sea, Air & Space Museum in New York City. In preparation for the anticipated relocation, engineers evaluated the vehicle in early 2010 and determined that it was safe to fly on the Shuttle Carrier Aircraft once again. At approximately 13:40 UTC on