The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of a radio receiver, identified by NSN 7R-5821-016969950-P8, with a quantity of 16 units required. This procurement necessitates engineering source approval due to the flight-critical nature of the item, which mandates that only approved sources with the requisite design capabilities and technical data may participate in the bidding process. Interested vendors must submit detailed qualifications and any necessary source approval documentation within 45 days of this presolicitation notice, with the primary contact for inquiries being Raymond J. Kent at (215) 697-2557 or via email at RAYMOND.KENT1@NAVY.MIL.