The Department of Defense, through the Defense Logistics Agency (DLA) Aviation at Philadelphia, PA, is seeking proposals for the procurement of 32 units of a flight-critical device identified by NSN 7R-7021-017148350-BL and reference number 35579-010. The procurement requires Government source approval prior to contract award, as the item is essential for operational readiness and the technical data available does not support full and open competition. Interested vendors must provide necessary documentation for source approval, as outlined in the NAVSUP Weapon Systems Support brochures, and submit their proposals within 45 days of this presolicitation notice. For further inquiries, potential bidders can contact Michael W. Bauder at (215) 737-5103 or via email at MICHAEL.BAUDER@DLA.MIL.