This document outlines a sole source federal contract opportunity for the overhaul of various cowling components for the F108 engine used in the KC-135 aircraft. The solicitation is for the overhaul of left hand and right hand fan cowlings, inlet nose cowling, and left hand and right hand fan duct assemblies. The contractor, Boeing Corporation, will overhaul 44 left hand fan cowlings, 17 right hand fan cowlings, 41 inlet nose cowlings, and various quantities of the fan duct assemblies over three ordering periods, with delivery required every 75 days after receipt of order. The total estimated value is not provided. The contract will be awarded on a sole source basis to Boeing given their experience as the original equipment manufacturer.