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 required for full and open competition is not available. Interested parties must provide comprehensive documentation to demonstrate their capability and experience in producing similar items, with a submission deadline of 45 days from the notice publication date. For inquiries, Aisha J. Varnadore can be contacted at (215) 737-4834 or via email at Aisha.Varnadore@dla.mil.