Airman 1st Class Aaron Barber, 28th Maintenance Squadron aerospace propulsion technician, cleans the base of a B-1 engine thermometer with denatured alcohol in an aircraft hangar on Ellsworth Air Force Base, S.D., July 19, 2012. Each engine is equipped with a thermometer that monitors the temperature inside the engine and relays information to the computer system in the cockpit.
Airman Ashley Thum
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