This notice covers an NSN 7R-7021-017333499-EY part, quantity 3 each, with delivery FOB origin. The item is flight critical and requires Government source approval prior to award; only previously approved sources have been solicited, and the Government intends to negotiate with only one source under FAR 6.302-1. New sources must submit the data required by the NAVSUP WSS Source Approval Information Brochure with their offer, and offers lacking that documentation will not be considered. Approval of a new source normally cannot be completed in time to delay award, so the Government may proceed based on fleet support needs. All responsible sources may express interest, but the Government may determine not to compete based on responses.