The Department of Defense, through the Department of the Navy's NAVSUP Weapon Systems Support, is seeking to procure four units of the part identified as NSN 7R-1615-011594710-VH, specifically for the assembly of helicopter rotor blades and components. This procurement requires engineering source approval due to the flight-critical nature of the item, necessitating that only approved sources may submit proposals, as the technical data necessary for full competition is not available. Interested vendors must provide comprehensive documentation to demonstrate their capability and experience in producing similar items, with a submission deadline of 45 days from the notice publication date. For further inquiries, potential bidders can contact Casey M. Brown at (215) 697-3752 or via email at CASEY.M.BROWN20.CIV@US.NAVY.MIL.