A sole-source procurement is intended for NSN 7H-4820-015513104 (ref 21841-001), quantity 1, with FOB origin delivery. The government does not own the data or rights needed to contract repair from other sources and has determined that buying the data or reverse engineering the part is uneconomical. Interested parties may obtain applicable military/federal specifications and standards from DODSSP/ASSIST, though patterns and drawings are not stocked there. All responsible sources may express interest and capability, but this notice is not a request for competitive proposals; the government will decide whether to compete based on responses. The acquisition is not being handled as a commercial item under FAR Part 12, and trade agreements may apply.