The Department of Defense, through the Defense Logistics Agency (DLA) Aviation at Philadelphia, PA, is seeking proposals for the procurement of three units of a flight-critical assembly component, specifically NSN 7R-1680-016099094-P8, REF NR 381900-1001. This opportunity is for a commercial/nondevelopmental/off-the-shelf item that requires Government source approval prior to contract award, as the technical data available has not been deemed adequate for full and open competition. Interested vendors must be previously approved sources or submit the necessary documentation for source approval, as outlined in the NAVSUP Weapon Systems Support Source Approval Information Brochures. Proposals must be submitted within 45 days of this presolicitation notice, and all inquiries should be directed to Alana Arthur at (215) 737-8443 or via email at ALANA.ARTHUR@DLA.MIL.