Oil change for a C-40C
Senior Airman Sarah Campbell, an aircraft engine mechanic in the 932nd Aircraft Maintenance Squadron, changes out an oil filter for a C-40 engine and replaces a drain plug, April 15, 2016, Scott Air Force Base, Illinois. The weather was a sunny but breezy spring day on the flight line and needed maintenance made for a great training opportunity. (U.S. Air Force photo by Christopher Parr)
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