This is a sole-source procurement for a quantity of two units of a flight-critical item, with delivery FOB origin. The part requires engineering source approval, and only previously approved sources have been solicited. New sources must submit the required source approval data with their proposal, as offers lacking this data will not be considered. The Government intends to negotiate with only one source under FAR 6.302-1, but all responsible sources may express interest and capability. This acquisition is not a commercial item purchase under FAR Part 12 and is subject to trade agreements.