Check Engine
Staff Sgt. Derek Malecki, front, 52nd Maintenance Squadron aerospace propulsion craftsman, reviews technical orders while Senior Airman Sean Flanagan, back, 52nd MXS aerospace propulsion journeyman, works on an F-16 Fighting Falcon engine at Spangdahlem Air Base, Germany, Oct. 17, 2017. The engine propulsion shop will conduct a preventive maintenance inspection on an F-16 engine every 400 flying hours to make sure the engine is running properly. (U.S. Air Force photo by Staff Sgt. Jonathan Snyder)

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Photo by: Staff Sgt. Jonathan Snyder |  VIRIN: 171017-F-RH756-0048.JPG