The Department of Defense, through the Defense Logistics Agency (DLA) Aviation at Philadelphia, PA, is seeking proposals for the procurement of a Gearbox Assembly, Main R, identified by NSN 7R-1680-016076871-H1. This procurement requires engineering source approval from the design control activity to ensure the quality of the part, as it is flight critical and necessitates that only previously approved sources are solicited. Interested vendors must provide comprehensive documentation demonstrating their capability to manufacture or repair the item, as well as any prior submissions for source approval, by the specified deadlines. For further inquiries, potential bidders can contact Jillian M. O'Connor at (215) 737-0550 or via email at jillian.oconnor@dla.mil.