This document provides details for a sole source federal contract opportunity to procure cowling components for F108 aircraft engines. The solicitation is being issued by the Department of the Air Force Materiel Command Lifecycle Management Center at Tinker Air Force Base to The Boeing Corporation for the overhaul of various cowling components including left hand fan cowling, right hand fan cowling, inlet nose cowling, and left and right hand fan duct assemblies. Delivery is required in lots of one to four units every 75 days for the various line items. The total estimated quantities to be procured are 44 units for the left hand fan cowling, 17 units for the right hand fan cowling, 41 units for the inlet nose cowling, and various quantities for the fan duct assemblies. The cowling components will be used on KC-135 aircraft and delivered to Tinker Air Force Base. Written requests for the solicitation are required with responses due May 1, 2017.