The Department of Defense, through the Naval Air Systems Command (NAVAIR), intends to establish a Basic Ordering Agreement (BOA) for the upgrade of Software Defined Sonobuoy Receiver (SDSR) and the procurement of Stimulator Test Equipment for Acoustic Communications (ACOMMS). This procurement aims to provide continued design, fabrication, qualification, and delivery of hardware, software, and firmware upgrades for P-3C, P-8A, and MH-60R aircraft, enhancing capabilities in Multi-static Active Coherent (MAC), High Altitude ASW (HAASW), and Navy Underwater Active Multiple Ping (NUAMP) systems. The selected contractor will support critical Air Anti-Submarine Warfare (ASW) systems from Fiscal Years 2025 through 2030, with responses to this presolicitation notice due within fifteen days to Kristen Custer at kristen.m.custer.civ@us.navy.mil. This opportunity is not open for competitive proposals, and interested parties are encouraged to express their capabilities in writing.