The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of a densitometer for aircraft, identified by NSN 7R-1680-015854736-P8. The requirement includes a quantity of one unit, with delivery terms set to FOB Origin, and emphasizes that the item is flight critical, necessitating Government source approval prior to contract award. Due to the lack of available technical data for competitive solicitation, only previously approved sources will be considered, and interested parties must submit detailed information as outlined in the NAVSUP WSS Source Approval Information Brochures. Proposals must be submitted within 45 days of the notice, and any inquiries can be directed to Amanda M. Sweeney at (215) 697-2198 or via email at AMANDA.SWEENEY@NAVY.MIL.