The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of five units of the signal converter (NSN 7R-5895-014608011-XH, REF NR PS491-1). This procurement requires engineering source approval due to the flight-critical nature of the item, necessitating that only previously approved sources may submit proposals, as the technical data available does not support full and open competition. Interested parties must provide comprehensive documentation to demonstrate their capability and experience in producing similar items, as well as comply with the qualification requirements set forth by the Government engineering activity. Proposals must be submitted within 45 days of the notice, and inquiries can be directed to Danielle Diciacco at (215) 697-5970 or via email at DANIELLE.DICIACCO.CIV@US.NAVY.MIL.