OVERVIEW: The A 17 *Västergötland* is a diesel-electric submarine (SSK) operated by the Swedish Navy. The vessel represents a significant upgrade and modernization of the original *Västergötland*-class submarines, incorporating advanced technologies to enhance its stealth, endurance, and combat capabilities.

DETAILS:
The *Västergötland*-class was initially commissioned in the late 1980s, designed to operate in the shallow and complex littoral waters of the Baltic Sea. Faced with evolving threat profiles and technological advancements, the Swedish Navy undertook a comprehensive mid-life upgrade program in the late 1990s. This upgrade, applied to several vessels of the class, including the A 17, involved the insertion of a new hull section extending the submarine's length and creating space for an Air Independent Propulsion (AIP) system. While the specific AIP technology fitted to the A 17 is not specified in available data, the upgrade greatly enhanced its submerged endurance, a critical factor for modern submarine operations. The design philosophy prioritizes acoustic stealth, maneuverability in confined waters, and the ability to effectively engage both surface and subsurface targets. This makes the *Västergötland* a highly capable platform for its operating environment.

The A 17 *Västergötland* fulfills a multi-role function, encompassing anti-submarine warfare (ASW), anti-surface warfare (ASuW), and intelligence, surveillance, and reconnaissance (ISR) missions. Its primary role is to maintain maritime superiority within Swedish territorial waters and contribute to regional security. The vessel’s advanced sensor suite allows for the detection, tracking, and classification of a wide range of targets. The SUBTASS towed array sonar significantly extends the submarine’s ASW detection range, while the AR-700S5 intercept receiver provides valuable electronic intelligence (ELINT) capabilities. The TRS 3110 Calypso IV navigation radar facilitates safe navigation, even in challenging conditions. The availability of both 533mm and 400mm torpedo tubes allows for the deployment of various weapon types optimized for different targets and engagement scenarios.

The installation of the PRS 3-15 passive ranging sonar and the CSU 83 cylindrical sonar provides enhanced target localization and tracking capabilities. The IPS CSU 83 (likely an integrated processing suite for the CSU 83) further refines the data received, improving the accuracy of target solutions. The MAS 83 mine avoidance sonar is critical for safe navigation in mine-threatened waters. The provision of both optical and low-light television (LLTV) periscopes allows for visual surveillance and target identification, particularly in littoral environments where radar or sonar might be less effective. The presence of a signal ejector suggests the capability to deploy countermeasures or communications buoys. The combination of advanced sensors, versatile weaponry, and the AIP upgrade makes the A 17 *Västergötland* a formidable asset for the Swedish Navy.

SPECIFICATION: Length: 48.5 m || Beam: 6.1 m || Draft: 5.6 m || Disp: 1070 t

SENSORS: PRS 3-15 || CSU 83 || SUBTASS || AR-700S5 || TRS 3110 Calypso IV [DRUA 33] || IPS CSU 83 || MAS 83 || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: 533mm TT || 400mm TT || Signal Ejector