The Government requires 55 each of NSN 7R-1610-016145786-EK (TDP Ver 002), delivered FOB origin. The item is flight critical and requires engineering source approval by the design control activity; only previously approved sources have been solicited, and they retain essential data rights or technical knowledge. The Government intends to solicit and negotiate with only one source under FAR 6.302-1, though responsible sources may identify their interest and capability or submit proposals. Non-approved sources must submit the required Source Approval Information Brochure data with their proposal and qualify under the Government engineering activity’s procedures; the Government may proceed with award without waiting for new-source approval. Standardized documents are available via DODSSP/ASSIST, and the Government is not using FAR Part 12 commercial-item procedures for this acquisition.