OVERVIEW: The S 524 Primo Longobardo [Salvatore Pelosi Class] is a diesel-electric attack submarine operated by the Italian Navy, commissioned in 1996. The Salvatore Pelosi class represents a significant improvement over the earlier Nazario Sauro class, incorporating enhanced acoustic stealth and improved sensor suites.

DETAILS:
The Salvatore Pelosi class was conceived in the late 1970s and early 1980s as a follow-on to the Nazario Sauro class, addressing perceived shortcomings in acoustic signature and sensor performance. The design emphasized reduced radiated noise through resilient mounting of machinery and improved hull hydrodynamics. Construction was undertaken by Fincantieri, with the Primo Longobardo being one of the final vessels of the class. The design philosophy centered on creating a capable, quiet submarine optimized for operations in the relatively shallow and congested waters of the Mediterranean Sea. The class benefits from lessons learned during the Sauro program, reflecting a gradual and iterative development process within the Italian submarine force. The extended hull provides enhanced internal space for systems and improved crew habitability.

The primary roles of the Primo Longobardo are anti-submarine warfare (ASW), anti-surface warfare (ASuW), and intelligence gathering. In an ASW role, the submarine relies on its passive sonar capabilities, including the IPD-70/S LF (Low Frequency) array for long-range detection and the MD-100/S towed array for improved target localization in challenging acoustic environments. For ASuW engagements, the 533mm torpedo tubes provide the means to deploy anti-ship torpedoes against surface combatants. The MM/BPS-704 radar intercept suite (likely the Italian designation for the 3RM-20 SMG system) enhances situational awareness by detecting and identifying radar emissions from surface vessels and aircraft, providing early warning and supporting electronic warfare operations. Intelligence gathering capabilities are augmented by the Generic Submarine Periscope, Optical, and Generic Submarine Periscope, LLTV (Low Light Television) systems, allowing for discreet observation and data collection in littoral environments.

The technical capabilities of the Primo Longobardo are centered around its enhanced acoustic stealth and advanced sensor suite. The installation of the DUUG-6 (likely designated M5 by the Italian Navy) integrated sonar suite, combining active and passive functionalities, provides a comprehensive underwater surveillance capability. The IPD-70/S MF (Medium Frequency) sonar further augments target tracking and classification. The MM/BLD-727 Thetis mine avoidance sonar contributes to safe navigation in mined waters. Integration of these sensors provides a tactical picture that supports proactive and reactive operational responses. The submarine's conventional diesel-electric propulsion system allows for extended submerged endurance at low speeds, further enhancing its stealth and operational flexibility.

SPECIFICATION: Length: 66.0 m || Beam: 6.8 m || Draft: 6.3 m || Disp: 1653 t

SENSORS: M5 [DUUG-6] || IPD-70/S MF || MD-100/S || MM/BPS-704 [3RM-20 SMG] || MM/BLD-727 Thetis || IPD-70/S LF || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: 533mm TT