The Department of Defense, through the Defense Logistics Agency (DLA) Aviation at Philadelphia, PA, is seeking qualified sources for the procurement of a Gearbox Assembly, AI, identified by NSN 7R-1680-015554507-H1, with a quantity of 2 each. This procurement requires engineering source approval due to the flight-critical nature of the item, necessitating that only approved sources may submit proposals, as the technical data available does not support full and open competition. Interested vendors must provide detailed documentation as outlined in the NAVSUP Weapon Systems Support Source Approval Information Brochures, and proposals must be submitted with all required data to be considered for award. For further inquiries, potential bidders can contact Jillian M. O'Connor at (215) 737-0550 or via email at jillian.oconnor@dla.mil.