This acquisition involves a quantity of four units of an NSN item, with delivery on an FOB origin basis. The item is flight critical and requires Government source approval prior to contract award; only previously approved sources have been solicited. If you are not an approved source, you must submit all required source approval information with your proposal, as failure to do so will result in non-consideration. The Government intends to solicit and negotiate with only one source under FAR 6.302-1, but all responsible sources may express interest or submit capability statements for consideration. A determination on whether to compete will be based on responses received.