We will be introducing a way to reset the aircraft to Cold & Dark on an aborted flight in a future update soon. For now, you can get a clean airframe by going into the Airframe Manager and clicking "Create new airframe" (you can then delete the old one). Also, whenever a crash-to-desktop occurs, please save the Log.txt file immediately, before restarting the simulator (otherwise the log gets overwritten). The Log is invaluable in being able to figure out what's going wrong.