Type 927 oceanographic surveillance ship

Type 927 acoustic surveillance ship is a type of vessel used by the People’s Liberation Army Navy. There are three known Type 927 ships,^[1] plus one predecessor Ruili No.10, which is slightly larger than Type 927 ships, and it was used to test onboard systems such as sonars for the three Type 927 ships.^[2] The first Type 927 ship was launched around June 2017 in Guangzhou.^[3] Type 927 has received NATO reporting name Dongjian class,^[4][5][6] 东监 in Chinese, meaning East Surveillance, because the West first observed it performing acoustic surveillance missions in East China Sea.

History
PRC
Status	Active
General characteristics
Class & type	Dongjian class
Type	Oceanographic surveillance ships (AGOS)
Displacement	5,000 long tons (5,100 t)
Length	90 m (295 ft 3 in)
Beam	30 m (98 ft 5 in)
Propulsion	Marine Diesel
Sensors & processing systems	Navigation radar
Electronic warfare & decoys	None
Armament	Small arms
Armour	None
Aircraft carried	1
Aviation facilities	Helipad

Characteristics

Type 927 vessels are twin-hulled, with a displacement of approximately 5,000 tonnes.^[1] The ships are 90 meters long and have a beam of 30 meters.^[3]

Construction

The first photos of a Type 927 under construction surfaced in 2017.^[7] Two Type 927s were constructed in Huangpu District, Guangzhou, and the third was constructed at the Wuchang Shuangliu shipyard in Wuhan.^[1]

Ships

As of end of 2021,there are a total of four ships, including the predecessor unit:

Type	NATO designation	Pennant No.	Name (English)	Name (Han 中文)	Commissioned	Displacement	Fleet	Status
Ruili No. 10 oceanographic surveillance ship	?	Rui-Li 10	Rui-Li 10	瑞利十号	2016	5300 t	All fleets	Active
Type 927 oceanographic surveillance ship (AGOS)	?	780	Beta Ursae Majoris	天璇星	2018	5000 t	South Sea Fleet	Active
		781	Gamma Ursae Majoris	天玑星	2019	5000 t	South Sea Fleet	Active
		782	Eta Ursae Majoris	瑶光星	2019	5000 t	South Sea Fleet	Active