The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure a cooling turbine identified by NSN 7R-1660-013177807-EL. This procurement is limited to a single source due to the absence of suitable technical data or manufacturing knowledge that would allow for alternative sourcing or qualification testing. The cooling turbine is critical for aircraft air conditioning, heating, and pressurizing systems, underscoring its importance in maintaining operational readiness. Interested parties must respond within 45 days of this presolicitation notice, and inquiries can be directed to Joshua J. Seltzer at (215) 697-2849 or via email at JOSHUA.J.SELTZER@NAVY.MIL.