OVERVIEW: The 401 Cakra [Type 209-1300] is a diesel-electric attack submarine operated by the Indonesian Navy, commissioned in 1982. The Cakra class represents a variant of the widely exported Type 209 submarine, specifically the 1300-ton variant.

DETAILS: The Type 209 submarine design, developed by Howaldtswerke-Deutsche Werft (HDW) of Germany, emerged as a highly successful export design during the Cold War. The Type 209-1300 variant, as represented by the Cakra class, was tailored to meet Indonesia's specific requirements for a capable and cost-effective submarine platform. The design emphasizes simplicity, reliability, and ease of maintenance, features that contributed significantly to its international appeal. The selection of the Type 209 by Indonesia reflects a strategic choice for a proven technology readily integrated into its existing naval infrastructure. The initial acquisition and subsequent operational experience have solidified the Type 209's role as a cornerstone of Indonesia's submarine force.

The primary roles of the 401 Cakra encompass anti-submarine warfare (ASW), anti-surface warfare (ASuW), and intelligence, surveillance, and reconnaissance (ISR). Its diesel-electric propulsion provides relatively quiet operation, crucial for ASW missions in littoral environments. While not designed for extensive blue-water operations, the Cakra class provides a potent deterrent and area denial capability within the Indonesian archipelago. The 533mm torpedo tubes allow the employment of a variety of modern torpedoes for engaging both surface combatants and submerged targets. Furthermore, the submarine's inherent stealth capabilities contribute significantly to its ISR missions, allowing for discreet monitoring of maritime activity.

The 401 Cakra's sensor suite provides a comprehensive situational awareness picture. The TRS 3100 Calypso III radar (designated DRUA 33C in submarine applications) is employed for surface search and navigation. The CSU 3-2 and PRS 3-4 sonar systems likely provide active and passive detection and ranging capabilities. The DR 2000U radar intercept receiver (RWR) facilitates the detection and identification of enemy radar emissions. The AN 410 is probably a passive ranging sonar. The IPS CSU 3 integrated propulsion control system enhances maneuverability and optimizes fuel consumption. The combination of a standard optical periscope and a low-light television (LLTV) periscope provides visual and enhanced night vision capabilities for target identification and surveillance.

SPECIFICATION: Length: 59.5 m || Beam: 6.2 m || Draft: 5.5 m || Disp: 1265 t

SENSORS: TRS 3100 Calypso III [DRUA 33C] || CSU 3-2 || PRS 3-4 || DR 2000U || AN 410 || IPS CSU 3 || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: 533mm TT