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KC-135 crew chiefs operate during isochronal inspection Dec. 10, 2020
Staff Sgt. Brandon Thompson, 22nd Maintenance Squadron KC-135 Stratotanker crew chief, removes screws from a KC-135 upper outward aileron lockout panel during an isochronal inspection Dec. 2, 2020, at McConnell Air Force Base, Kansas. Isochronal inspections, taking place every two years, allow maintainers to thoroughly examine the internal and external segments of an aircraft for corrosion, cracks or chips. (U.S. photo by Senior Airman Alan Ricker)