The Department of Defense, through the Defense Logistics Agency (DLA) Aviation at Philadelphia, PA, is seeking proposals for the procurement of 22 units of a frequency converter, identified by NSN 7R-5895-016900881-CB and reference number 7-1500-1. 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 parties must provide detailed documentation as outlined in the NAVSUP Weapon Systems Support Source Approval Information Brochures, and proposals must be submitted within 45 days of this notice. For further inquiries, potential bidders can contact Aisha J. Varnadore at (215) 737-4834 or via email at Aisha.Varnadore@dla.mil.