The torpedo's seeker has an active electronically steered " pinger " ( 2D phased array sonar ) that helps avoid having to maneuver as it closes with the target.
22.
Local operations again occupied her time, some of which involved serving as a test platform for a new Towed Array Sonar System ( TASS ) until the spring of 1976.
23.
The principal ASW weapons systems were the ship's Lynx helicopter and triple torpedo tubes ( STWS ), with 2087 towed array sonar a key part of the sensors fit.
24.
Following the installation of an advanced towed array sonar system in 1987, " O'Brien " conducted experimental sonar evaluation operations in the Northern Pacific and Bering Sea.
25.
Over the end of 1997 and the start of 1998, " Onslow " and " Otama " were used for trials of the Australian-designed Narama towed array sonar.
26.
Various subcontracts like the Thales CAPTAS-2 Towed array sonar, the Bofors 57 mm gun, torpedo launching systems have already been awarded and the first ship is expected to be completed in 2018.
27.
The older boats were upgraded, it is believed that the modernization included a hull stretch to the Type 1400 length, provision for tube-launched Harpoon missiles and the addition of a towed-array sonar.
28.
In 2005, " Triumph " began a ?00 million nuclear refuel and refitting period which also saw the installation of an updated 2076 bow, flank and towed array sonar and a new command and control system.
29.
The class uses the more advanced ARCI Modified AN / BSY-2 combat system, which includes a new, larger spherical sonar array, a wide aperture array ( WAA ), and a new towed-array sonar.
30.
South Africa did not exercise the option of purchasing a'clip-on'towed array sonar based on advice from existing users that the system is clumsy and would prove impractical in South Africa's envisaged operational context.
