The requirement is for 24 units of a flight-critical part that requires Government engineering source approval prior to award; only previously approved sources have been solicited, and an alternate source must qualify under the design control activity’s approved procedures. Non-approved sources must submit the Source Approval Brochure information with their proposal, and offers lacking all required data will not be considered. 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. The Government is not using FAR Part 12 commercial-item procedures for this acquisition, and drawings are not available. Delivery is FOB origin.