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 Drive Assembly, PTO, Airc, under the presolicitation notice. The procurement involves 29 units of NSN 7R-2840-015846179-TN, which requires engineering source approval to ensure quality and compliance with flight-critical standards. This item is essential for maintaining operational capabilities, and only approved sources may submit proposals; new sources must provide comprehensive documentation for approval. Interested parties should contact Charles F. Horan at (215) 697-1303 or via email at CHARLES.F.HORAN@NAVY.MIL, with proposals due within 45 days of the notice publication.