The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of the main blade assembly, identified by NSN 7R-1615-016938205-H5. The procurement involves a quantity of 28 units, with the requirement for Government source approval prior to contract award due to the flight-critical nature of the item and its unstable design, which necessitates significant changes. Interested vendors must provide detailed technical data and evidence of prior experience in producing similar items, as proposals lacking the required documentation will not be considered. For further inquiries, interested parties can contact Leah L. Brown at (215) 697-0370 or via email at LEAH.L.BROWN@NAVY.MIL, with proposals due within 45 days of the notice publication.