China Trains KQ-200 Aircraft for Continuous Submarine Hunts in Contested Waters Near Taiwan.

China’s PLA Naval Aviation has tested continuous submarine-hunting operations with the KQ-200 maritime patrol aircraft, the Chinese Ministry of National Defense reported on June 14, 2026, with additional footage released by the China Navy on July 16. The exercise matters because sustained anti-submarine coverage depends on crews and aircraft handing off contacts without allowing a submarine to escape.

The training covered search, classification, tracking, firing-solution development, and simulated attack while aircraft rotated through refuelling and maintenance. This capability would strengthen China’s ability to maintain pressure on submarines despite weather, evasive manoeuvres, and the operational limits of individual crews and aircraft.

Related topic: China Expands J-15 Fighter Training to Prepare Fujian Aircraft Carrier for High-Tempo Operations.

A PLA Naval Aviation KQ-200 maritime patrol aircraft conducts extended anti-submarine training focused on detection, tracking, coordinated handovers, and simulated torpedo attacks against submerged targets (Picture source: China MoD).

The aircraft shown is consistent with the KQ-200, the PLA Navy’s only operational fixed-wing anti-submarine aircraft identified in open sources. It entered service around 2017, and more than 20 had been distributed among the Northern, Eastern, and Southern Theater Command naval components by early 2023. Based on the Y-9 airframe, the four-engine turboprop is credited with a maximum speed near 600 km/h, a range of approximately 5,000 km, and an endurance exceeding eight hours. Published Chinese military research and U.S. government analysis identify a surface-search radar, electro-optical turret, electronic sensors, an internal sonobuoy system, and a large magnetic-anomaly detector in the tail. A typical mission crew reportedly comprises two pilots, a tactical commander, and four radar, acoustic, and electro-optical operators. These figures remain open-source estimates because China has not released an official KQ-200 technical manual.

The aircraft’s main search instrument is not its radar but its expendable acoustic field. The KQ-200 is widely assessed to carry about 100 sonobuoys in four rotary dispensing cabinets, including the AVIC SQ-4 acoustic buoy and SQ-5 bathythermograph buoy. The SQ-5 measures temperature conditions at different depths before operators select buoy depth and spacing; this matters because thermal layers can bend or trap sound and allow a submarine to pass below a poorly positioned array. PLA academic models have used detection radii of 1 to 2 km in shallow water, two-hour operating periods, and a 60 km radio link to the aircraft, while other Chinese studies assume six to eight hours of passive operation, two to three hours in active mode, and, under favourable conditions, passive detection out to 10 km. These are planning values rather than confirmed equipment performance, but they show that the PLA is studying buoy density, communications limits, and acoustic conditions in quantitative terms.

A normal prosecution would begin with radar or electronic detection of a surface contact, periscope, snorkel or associated transmission, followed by passive sonobuoys placed across the submarine’s estimated route. Active buoys may then be added to reduce location uncertainty, while the KQ-200 descends for a magnetic-anomaly detector pass after the contact area has been narrowed. One Naval Aviation University study modelled magnetic search at an altitude of 100 metres and assumed an effective detection distance of 500 metres; the figure should not be treated as an official specification, but it illustrates why the tail sensor is a final localization aid rather than a wide-area search device. The tactical commander must combine acoustic bearings, buoy positions, magnetic indications and the submarine’s estimated speed and course into a sufficiently accurate firing solution.

The KQ-200’s weapons are carried internally. U.S. Naval War College research assesses that the aircraft may accommodate as many as ten lightweight torpedoes, including the Yu-7, although the load would depend on fuel, buoy carriage, and mission duration. The larger pump-jet-propelled Yu-11 has also been associated with the aircraft, but its operational integration has not been officially confirmed; footage released in June 2023 showed a Southern Theater Command KQ-200 dropping an unidentified torpedo whose propulsion arrangement may have differed from the propeller-driven Yu-7. Chinese sources have also described air-dropped depth weapons fitted with a guidance section and control surfaces for acoustic terminal correction, rather than relying only on preset-depth detonation. Beijing has not published dependable figures for the airborne torpedoes’ range, speed, seeker logic or warhead, so highly precise values circulating online should be treated cautiously.

The prolonged exercise appears designed to test an anti-submarine network rather than a single aircraft. PLA operational writing describes land-based command posts assigning an “on-call point” to a KQ-200, surface warships contributing hull-mounted and towed sonar data, and helicopters such as the Z-18F, Ka-28 and Z-9C conducting closer localization or attack. One published Chinese model places three or four warships between two linear sonobuoy barriers; another uses 86 buoys to search 2,318 square nautical miles over five hours, followed by a figure-eight flight pattern that keeps the aircraft within radio range of the buoy field. Those calculations are theoretical, but they explain the emphasis on coordination, handovers, and sustained coverage in the latest exercise.

China is increasing this training because submarines remain one of the most difficult threats to its plans inside the First Island Chain. In a Taiwan blockade or invasion scenario, U.S. and allied attack submarines could target amphibious ships, replenishment vessels, carrier groups and surface escorts while remaining less exposed than aircraft or surface warships to China’s land-based missile force. The Bashi Channel, Luzon Strait and approaches east of Taiwan are therefore natural monitoring areas, while Southern Theater Command aircraft also protect the approaches to Hainan, where China bases nuclear-powered attack submarines and ballistic-missile submarines. The 2025 U.S. report to Congress identifies the First Island Chain as the geographic center of China’s current military planning and states that the PLA is refining invasion, blockade, and precision-strike options against Taiwan.

The exercise nevertheless does not demonstrate that the PLA Navy can reliably detect a quiet submarine in wartime. The official material provides no information on target type, initial detection range, acoustic conditions, percentage of time held in contact, false-contact rate, weapon accuracy, or performance under hostile air and electronic attack. The U.S. Defense Department’s 2024 assessment still judged that China lacked a robust deep-water anti-submarine capability, despite improvements in warships and specialized aircraft. The more defensible conclusion is that the PLA Navy is using longer drills to address a known operational problem: converting intermittent sensor detections into a continuous, transferable track that can survive long enough for a torpedo attack. Whether it can reproduce that process against a modern nuclear-powered submarine under combat conditions remains unproven.

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