KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, Mel Romans, with United Space Alliance, prepares the area on orbiter Discoverys leftwing for installation of the final Reinforced Carbon-Carbon (RCC) panel. The leading edges of each of an orbiters wings have 22 RCC panels. They are light gray and made entirely of carbon composite material, which protect the orbiter during re-entry. The molded components are approximately 0.25- to 0.5-inch thick and capable of withstanding temperatures up to 3,220 degrees F. Following the Columbia accident in February 2002, which was caused by a breach in an RCC panel that allowed hot gases into the vehicle, each panel on Discovery was removed and thoroughly inspected before final reinstallation. Discovery is the designated orbiter to fly on the Return to Flight mission STS-114, the first Space Shuttle to launch since the accident. The launch window for the mission is May 12 to June 3, 2005.