The Department of Defense, specifically the Department of the Navy's NAVAIR Warfare Center Aircraft Division, intends to procure the upgrade and calibration of Air Data Test Sets (ADTS) through a sole source contract with Druck, LLC, the Original Equipment Manufacturer (OEM). The procurement involves the manufacture of two ADTS ECP kits to upgrade Spain's existing systems to the specified part number ADTS405-5643, as mandated by the ECP 6649-17-0001 directive. This upgrade is critical for maintaining the operational capabilities of the aircraft systems that rely on accurate air data measurements. Interested parties can direct inquiries to Molly Jackson at molly.s.jackson.civ@us.navy.mil for further information regarding this presolicitation opportunity.