The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of two units of a flight-critical part identified by NSN 7R-7021-015817917-E7. This procurement requires engineering source approval from the design control activity to ensure the quality and reliability of the part, which necessitates that only approved sources may submit proposals. The selected source must demonstrate unique design capability and possess the necessary technical data, as the item is essential for maintaining operational readiness. Interested parties must submit their proposals along with the required source approval documentation within 45 days of this presolicitation notice, and inquiries can be directed to Sara M. Hojnowski at sara.hojnowski@navy.mil or by phone at (215) 697-2198.