Airman 1st Class Will Schaumann, 28th Maintenance Squadron aerospace propulsion technician, disassembles a B-1 engine thermometer for an isochronal inspection in an aircraft hangar on Ellsworth Air Force Base, S.D., July 19, 2012. Isochronal inspections must be conducted on an aircraft's engine after every 100 hours of flying time per established maintenance guidelines. (U.S. Air Force photo by Airman Ashley J. Cass/Released)