This is a sole-source procurement for 2 units of a flight-critical item (NSN 7R-5841-016504544-P8) requiring Government source approval prior to award, with delivery FOB origin. Only sources previously approved by the Government for this item have been solicited; the part is not available via full and open competition due to limited technical data and essential supplier knowledge. Alternate or new sources must submit the required Source Approval Brochure data with their proposal to be considered. The Government intends to negotiate with only one source under FAR 6.302-1, but all responsible sources may express interest or submit capability statements. Responses will be considered for determining whether to conduct a competitive procurement.