Air Force Senior Airman Shannon Wilson uses a beta tube spanner wrench to replace a beta tube in a C-130J Super Hercules aircraft engine at Bagram Airfield, Afghanistan, June 27, 2016. Wilson is a crew chief assigned to the 455th Expeditionary Aircraft Maintenance Squadron. The beta tube allows oil pressure to be directed to or from the propeller piston. Air Force photo by Senior Airman Justyn M. Freeman