# Asagiri-class destroyer

The Asagiri-class destroyer (あさぎり型護衛艦, Asagiri-gata-goei-kan) is a class of destroyer, serving with the Japan Maritime Self-Defense Force (JMSDF). It was the second class of first-generation general-purpose destroyers of the JMSDF.

## Background

The JMSDF started construction of a Hatsuyuki-class destroyer since FY1977. This was the first class of general-purpose destroyers (汎用護衛艦, Hanyou-goei-kan) under the eight ships / eight helicopters concept. In this concept, each flotilla would be composed of one helicopter destroyer (DDH), five general-purpose destroyers (DD), and two guided-missile destroyers (DDG).
However, due to constraints such as budget, the design of the Hatsuyuki class was compelled to compromise in terms of C4I function, resistance, and durability. Thus, destroyers to be built after FY1983, Asagiri class were changed to an evolved design with expanded hull and enhanced equipment.

## Design

The hull is an enlarged type of Hatsuyuki class, and the hull form is of the shelter deck style. Also, as the latter batch of the Hatsuyuki class, the upper structure is made of steel, but since it was incorporated into the design from the beginning, the adverse effect on the movement performance was solved.
The engine room was greatly renovated. Instead of the COGOG propulsion system of the Hatsuyuki class, this class has the COGAG propulsion system with four Kawasaki-Rolls-Royce Spey SM1A gas turbines. With these powerful engines, it was possible to run at 26 knots (48 km/h; 30 mph) by driving only two of the four engines, and the benefits of tracking a submarine were especially great. An alternating arrangement was introduced to improve resistance and durability, as in the steam turbine driven destroyers.

## Equipment

The earlier batch was equipped with the OYQ-6 combat direction system (CDS). This system employed one AN/UYK-20 computer as the same as the OYQ-5 tactical data processing system of the Hatsuyuki class, but with expanded memories, it can exchange tactical data via Link-11, which the OYQ-5 does not support. Later, all OYQ-6 systems were upgraded to the OYQ-7, integrated with the OYQ-101 ASW Direction System. All ships of this class were later retrofitted with the terminal for the MOF system, the key operational C4I system of the JMSDF which uses the Superbird SHF-SATCOM.
The surface-search radars were replaced by OPS-28. The air-search radars were updated to OPS-14C in the earlier batch, and in the latter batch, OPS-24 3D radars were introduced. This was a maritime version of the land-based J/FPS-3 early-warning radar, and first shipboard active electronically scanned array radar in the world. In the latter batch, electronic warfare support measures systems were also replaced by NOLR-8, completely newly developed with emphasis on anti-ship missile defense.
Its weapon system is basically the same as the Hatsuyuki class except for the minor change on its FCS. However, a new SH-60J was installed as a shipboard helicopter, so a large capacity data link device was installed. The hangar is enlarged in order to accommodate two helicopters, but only one helicopter is used operationally.

## Ships in the class

Yamagiri and Asagiri were converted into training vessels for a few years.
| Pennant no. | Name | Laid down | Launched | Commissioned | Builder | Home port | Note |
| DD-151 TV-3516 | Asagiri | 13 February 1985 | 19 September 1986 | 17 March 1988 | IHI Corporation, Tokyo | Maizuru | Converted to training vessel (TV-3516) on 16 February 2005 re-converted to DD-151 on 14 March 2012 |
| DD-152 TV-3515 | Yamagiri | 3 March 1986 | 10 October 1987 | 25 January 1989 | Mitsui, Tamano | Yokosuka | Converted to training vessel (TV-3515) on 18 March 2004 re-converted to DD-152 in March 2011 |
| DD-153 | Yūgiri | 25 February 1986 | 21 September 1987 | 28 February 1989 | Sumitomo Heavy Industries, Uraga | Yokosuka | 4 June 1996 - accidentally shot down USN A-6E Intruder during live-fire CIWS exercise (part of RIMPAC '96); two aviators ejected safely & rescued by Yūgiri; malfunction in Phalanx CIWS initially implicated as cause of incident but human error later blamed |
| DD-154 | Amagiri | 3 March 1986 | 9 September 1987 | 28 February 1989 | IHI Corporation, Tokyo | Yokosuka | |
| DD-155 | Hamagiri | 20 January 1987 | 4 June 1988 | 31 January 1990 | Hitachi, Maizuru | Ominato | |
| DD-156 | Setogiri | 9 March 1987 | 12 September 1988 | 14 February 1990 | Hitachi Zosen Corporation | Maizuru | |
| DD-157 | Sawagiri | 14 January 1987 | 25 September 1988 | 6 March 1990 | Mitsubishi Heavy Industries Nagasaki | Sasebo | |
| DD-158 | Umigiri | 31 October 1988 | 9 November 1989 | 12 March 1991 | IHI Corporation, Tokyo | Kure | |
* JS Asagiri (DD-151)
* JS Yamagiri (DD-152)
* JS Yūgiri (DD-153)
* JS Amagiri (DD-154)
* JS Hamagiri (DD-155)
* JS Setogiri (DD-156)
* JS Sawagiri (DD-157)
* JS Umigiri (DD-158)
* The hangar deck of JS Umigiri (DD-158)
* JS Asagiri (TV-3516)