Roger Racine writes: > At 02:01 PM 11/3/2000 , [log in to unmask] wrote: > >NASA's page on the recently tested X-38 crew return vehicle > >(http://www.dfrc.nasa.gov/PAO/PAIS/HTML/FS-038-DFRC.html) contains the > >following statement: > > > >"The X-38 flight computer is commercial equipment that is currently used > >in aircraft, and the flight software operating system is a commercial system > >already in use in many aerospace applications." > > > >Does anyone on this list have more details on the X-38 software that they > >can share? > > > >F. Britt Snodgrass > > VxWorks OS, application software is written in C. > > Roger Racine From comp.risks- Date: Mon, 6 Nov 1972 16:46:10 -0500 (EST) From: "James H. Paul" <[log in to unmask]> Subject: Unplanned roll in NASA's X-38 *Aviation Week & Space Technology*, 6 Nov 2000, p. 24 "NASA's X-38 Vehicle 131R did a slow, 360-deg. roll after release from its B-52 carrier aircraft on Nov. 2. It was the first free flight of the vehicle, which automatically stabilized under the preprogrammed deployment of a drogue chute and made a successful landing under parafoil on a dry lakebed runway, as scheduled, at Edwards AFB, Calif. The vehicle sustained no damage in the test. Project officials said they would have to do some trouble-shooting to figure out why the Crew Return Vehicle (CRV) prototype rolled at an estimated average rate of about 20 deg. per sec. during its 24 sec. of scheduled free flight. A software problem in the vehicle's flight control system was suspected, although project officials were also looking at whether aerodynamic disturbances immediately after separation might have played a role. Actual separation from the B-52 was clean, and the flight control system maintained angle of attack throughout the 18-sec. roll. The vehicle is an 80%-scale version of the CRV designed to provide emergency escape for International Space Station crews."