Airmen of the 28th Maintenance Squadron remove the flap slat torque tube limiters during an isochronal inspection at Ellsworth Air Force Base, S.D., April 10, 2012. B-1’s must undergo isochronal inspections every 900 calendar days to ensure the safety and readiness of aircraft. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)