This is a procurement for an indefinite quantity contract to supply aircraft duct assemblies, with a base period of 3 years and no option periods. The estimated annual quantity is 40 units, with delivery required 557 days after the date of order. Inspection and acceptance will occur at the origin, but the FOB point is destination. The solicitation includes a reverse auction process, and offerors must be certified by the DOD to access the required unclassified technical data. The performance of services location is not specified.