The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of an autocollimator, identified by NSN 7R-4920-015750494-QE and reference number T6551941-1, with a quantity of one unit required. This procurement necessitates engineering source approval due to the flight-critical nature of the item, which mandates that only approved sources may be considered for the contract, as they possess the unique design capabilities and technical data essential for maintaining the quality of the part. Interested parties must submit their proposals along with the required source approval documentation within 45 days of this notice, and can direct inquiries to Shannon K. Fitzgerald at (215) 697-3638 or via email at SHANNON.K.FITZGERALD@NAVY.MIL.