View source for Engineering:ZSU-23-4 Shilka

{{Infobox weapon|is_vehicle=yes| name=ZSU-23-4 "Shilka"
| image= ЗСУ-23-4_«Шилка»_в_Музее_отечественной_военной_истории.jpg
| image_size = 250
|caption=A ZSU-23-4 on display at the Museum of Russian Military History
|type=[[Engineering:Self-propelled anti-aircraft weapon|Self-propelled anti-aircraft gun]]
|origin=Soviet Union
|service=1960–present
|used_by=See Operators
|wars=See Combat history
|designer=
|design_date=1957–1960
|production_date=1964–1982
|manufacturer=Ulyanovsk Mechanical Plant (UMZ), Mytishchi Machine-Building Plant (MMZ)
|unit_cost={{currency|357000|USD}} (export price to [[Place:Libya|Libya]], 1972/73)<ref>{{Cite journal|last=Efrat|first=Moshe|date=1983|title=The Economics of Soviet Arms Transfers to the Third World. A Case Study: Egypt|url=https://www.jstor.org/stable/151253|journal=Soviet Studies|volume=35|issue=4|pages=437–456|doi=10.1080/09668138308411496 |jstor=151253 |issn=0038-5859}}</ref>
|number=About 6,500<ref name="militaryparitet"/>
|length={{convert|6.535| m|ftin|abbr=on}}<ref name="otvaga2004">{{cite web |url=http://otvaga2004.narod.ru/otvaga2004/wars1/wars_02.htm |title=В Боях На «Шилке» |access-date=4 May 2008 |url-status=dead |archive-url=https://web.archive.org/web/20071225194735/http://www.otvaga2004.narod.ru/otvaga2004/wars1/wars_02.htm |archive-date=25 December 2007  }} В Боях На</ref>
|width={{convert|3.125| m|ftin|abbr=on}}<ref name="otvaga2004"/>
|height={{convert|2.576 |m|ftin|abbr=on}}<br>{{convert|3.572 |m|ftin|abbr=on}} with radar elevated<ref name="Шилка">http://www.army.lv/?s=703&id=65&v=1#info {{webarchive|url=https://web.archive.org/web/20081210170515/http://www.army.lv/?s=703&id=65&v=1 |date=10 December 2008 }} ЗСУ-23-4</ref><ref>{{cite web|url=http://www.svzriu.ru/teh.php?type=shilka|title=СВЗРИУ<!-- Bot generated title -->|access-date=22 May 2017|url-status=dead|archive-url=https://web.archive.org/web/20081208005931/http://www.svzriu.ru/teh.php?type=shilka|archive-date=8 December 2008}}</ref>
|weight=19 [[Tonne|tonne]]s<ref name="otvaga2004" /><ref name="Шилка" />
|suspension=Individual torsion bar <!--with hydraulic shock absorbers of 1st, 5th left and 6th right road wheels -->
|clearance={{convert|375| mm|in|abbr=on}}<ref name="otvaga2004" />
|speed={{convert|50| km/h|abbr=on}} road<br>{{convert|30|km/h|abbr=on}} off-road<ref name="http://airbase.ru/hangar/weapons/zsu-23-4/index.htm">[http://airbase.ru/hangar/weapons/zsu-23-4/index.htm ZSU-23-4 'Shilka'<!-- Bot generated title -->] {{webarchive|url=https://web.archive.org/web/20081207191658/http://airbase.ru/hangar/weapons/zsu-23-4/index.htm |date=7 December 2008 }}</ref>
|fuel_capacity= 515 [[Litre|L]]<ref name="pzaku">{{cite web|url=http://pzaku.net/homepage/15/|title=ПВЗРККУ: ЗСУ-23-4|access-date=22 May 2017|url-status=dead|archive-url=https://web.archive.org/web/20100525111446/http://pzaku.net/homepage/15/|archive-date=25 May 2010}}</ref>
|vehicle_range=450 km (road), 300&nbsp;km (off-road)<ref name="http://airbase.ru/hangar/weapons/zsu-23-4/index.htm"/>
|primary_armament=4 × 23 mm 2A7 autocannons (AZP-23 "Amur" quad automatic anti-aircraft gun), ammunition 2,000 rounds
|secondary_armament=
|armour=Welded steel, {{convert|9.2|mm|abbr=on}} turret, up to 15 mm hull
|engine=V-6R, 6-cylinder 4-stroke airless-injection water-cooled 20-litre diesel
|crew=4 (commander, driver, gunner, radar operator)
|engine_power=280 hp (209 kW) at 2,000&nbsp;rpm<ref name=vif2>{{cite web |url=http://armoured.vif2.ru/zsu-23-4.htm |title=Зенитная самоходная установка ЗСУ-23-4 "Шилка" |access-date=15 May 2008 |url-status=dead |archive-url=https://web.archive.org/web/20080105065635/http://armoured.vif2.ru/zsu-23-4.htm |archive-date=5 January 2008  }} Зенитная Самоходная Установка ЗСУ-23-4</ref>
|pw_ratio=14.7&nbsp;hp/tonne (11.0&nbsp;kW/tonne)
}}

The '''ZSU-23-4''' "'''Shilka'''" is a lightly armored Soviet self-propelled, [[Engineering:Radar|radar]]-guided [[Social:Anti-aircraft warfare|anti-aircraft]] weapon system ([[Engineering:Self-propelled anti-aircraft weapon|SPAAG]]).  It was superseded by the 9K22 Tunguska (SA-19 Grison).

==Etymology==
The acronym "ZSU" stands for ''Zenitnaya Samokhodnaya Ustanovka'' ({{lang-ru|Зенитная Самоходная Установка}}), meaning "anti-aircraft self-propelled system"; the "23" signifies the bore diameter in millimetres; the "4" signifies the number of gun barrels. It is named after the Shilka River in Russia. Afghan soldiers nicknamed it the "[[Engineering:Sewing machine|sewing machine]]" due to the sound of its cannons firing. It is also referred to by its nickname of "[[Religion:Zeus|Zeus]]", derived from the Russian acronym.

==History==
[[File:ZSU-23-4-latrun-4.jpg|thumb|left|ZSU-23-4 at Yad la-Shiryon Museum, Israel]]
The previous Soviet self-propelled anti-aircraft gun (SPAAG), the [[Engineering:ZSU-57-2|ZSU-57-2]], was armed with two 57&nbsp;mm [[Engineering:Autocannon|autocannon]]s; it was aimed optically using a basic tracking and lead calculating system. The ZSU-57-2 was not particularly successful despite its very powerful autocannons; given their large caliber, it could only carry 300 rounds, was inaccurate as it lacked radar and could not fire while on the move.

The [[Engineering:ZPU|ZPU]] series armed with 14.5&nbsp;mm heavy machine guns carried on a towed mount for stationary, point air defence had a much higher rate of fire. The 23&nbsp;mm version of this weapon system was known as the [[Engineering:ZU-23-2|ZU-23-2]], a towed mount carrying two 23&nbsp;mm cannons. However, these towed or improvised truck-mounted weapons had similar disadvantages.

The development of the ZSU-23-4 "Shilka" began in 1957 along with ZSU-37-2 "Yenisei"<ref>Cancelled on 20 September 1962</ref> and the vehicle was brought into service in 1965, replacing all ZSU-57-2s in air defense units toward the beginning of the 1970s. The ZSU-23-4 was intended for AA defense of military facilities, troops, and mechanized columns on the march; originally, the more powerful guns of "Yenisei" were judged to be effective at covering the inner dead-zone of Soviet [[Engineering:Surface-to-air missile|surface-to-air missile]] systems despite the increased weight of the vehicle, but commonality prevailed. Initially, tank regiments should have had the anti-aircraft artillery battalion of "Shilka" (consisting of two batteries, four ZSU-23-4s in each). At the end of the 1960s, one battery was equipped with ZSU-23-4s and the other with ZSU-57-2s. Motorized rifle and tank regiment standard anti-aircraft batteries consisted of two platoons later (one platoon was equipped with four ZSU-23-4s and another with four mobile surface-to-air missile systems [[Engineering:9K31 Strela-1|9K31 Strela-1]] or 9K35 Strela-10).  The ZSU-23-4 combined a proven radar system, the non-amphibious chassis based on GM-575 tracked vehicle, and four 23&nbsp;mm autocannons. This delivered a highly effective combination of mobility with heavy firepower and considerable accuracy. The ZSU-23-4 outclassed all NATO anti-aircraft guns at the time, and it is still regarded as posing a major threat for low-flying fixed-wing aircraft and helicopters.

The system was widely fielded throughout the [[Organization:Warsaw Pact|Warsaw Pact]] and among other pro-Soviet states. Around 2,500 ZSU-23-4s, of the total 6,500 produced, were exported to 23 countries. The Warsaw Pact's successor states continue to manufacture and supply variants of the ZSU-23-4, notably the {{wipe|Ukraine}} "Donets" and Polish "Biala" variants.

ZSU-23-4 units saw active service in the Yom Kippur War (1973) and other Arab-Israeli conflicts, the Iran–Iraq War (1980–1988), and the First Gulf War (1990). During the Yom Kippur War, the system was particularly effective against the {{wipe|Israeli Air Force}}. Israeli pilots attempting to fly low in order to avoid SA-6 missiles were often shot down by ZSU-23-4s as in Operation Doogman 5. During the [[Religion:Soviet–Afghan War|Soviet–Afghan War]] ZSU-23-4 units were used widely and to great effect against [[Religion:Mujahideen|mujahideen]] positions in the mountains, the ZSU-23-4's guns being able to elevate much higher than the weapons on [[Engineering:BMP-1|BMPs]], [[Engineering:BTR-60|BTRs]], T-55s, or T-62s.<ref>Russian General Staff (translated and edited by Lester Grau and Michael Gress) (2002); ''The Soviet–Afghan War: How a Superpower Fought and Lost''; University Press of Kansas, p. 38. {{ISBN|0-7006-1185-1}}.</ref> They were also used to suppress defensive positions around the presidential palace during the initial coup in Kabul at the start of the Soviet-Afghan war. The Russian Army used the ZSU-23-4 for mountain combat in Chechnya.

==Description==
[[File:ZSU234graphic2.gif|thumb|right|350px|ZSU-23-4 graphic]]
The radar-guided ZSU-23-4 "Shilka" SPAAG, with its four 23&nbsp;mm (0.90") autocannons, was a revolutionary SPAAG, proving to be an extremely effective weapon against enemy attack aircraft and helicopters under every weather and light condition. The ZSU-23-4 has a very high density, rate and accuracy of fire, as well as the capability for each of the four autocannons to fire its own type of projectile from separate belts. While it is technically possible that each cannon shoots different type of ammunition, there were two types commonly used in late 1970s: OFZT incendiary fragmentation and BZT armour-piercing tracer, which were to be loaded in 3:1 ratio—three OFZT, then one BZT, every 10th BZT round equipped with so-called "copper remover" and marked. Operators were strongly discouraged from shooting from a single barrel.

The appearance of the "Shilka" caused significant changes in NATO tactics in aircraft use at low altitude over the battlefield. Despite its present obsolescence as a modern short-range anti-aircraft weapon, the ZSU-23-4 is still deadly for enemy light armoured vehicles, infantry and firing points as an infantry-support vehicle. With its high rate of accurate fire, the ZSU-23-4 can even neutralize tanks by destroying their gun sights, radio antennas, or other vulnerable parts.<ref name= "Шилка"/> ZSU-23-4s, especially late models, have excellent performance and good systems reliability.

Based on the GM-575 tracked vehicle chassis, which used components from the [[Engineering:PT-76|PT-76]] light amphibious tank, the ZSU-23-4 mounts an armored turret holding four liquid-cooled 23&nbsp;mm (0.9") 2A7 autocannons linked to an RPK-2 "Tobol" radar (NATO designator: "Gun Dish"). The vehicle weighs 19 tonnes (late modifications up to 21 tonnes), has a movement range of {{convert|450|km|mi|abbr=on}} and a top speed of 50&nbsp;km/h (31&nbsp;mph). Additional firepower of late modifications can be supplied by a roof-mounted pod of six short-range SA-18 SAMs, or side-mounted SA-16s.

The crew numbers four: driver, commander, gunner and radar operator. The driver's compartment is located in the nose part of the vehicle. The fighting compartment is in the center, and the engine compartment is in the rear part of the vehicle.

The transmission consists of a multi-plate metal-contact main clutch, a manual gearbox with five forward gears, two planetary two-step steering gears with locking frictions and two final drive groups. The vehicle chassis has six single rubber tired road wheels, a rear drive sprocket with detachable sprocket rings (lantern-wheel gear) and one idler wheel per side. The first and fifth left, and sixth right road wheels have hydraulic shock absorbers. The track is 11.904 m long, 382&nbsp;mm (15") wide and has 93 links.

Because of a large number of different pipes and tubes to detach during maintenance, the repair procedure for some of the vehicle's mechanisms is hard (for example, replacement or repair of a starter). The electric drive of an air outlet hatch of a gas turbine engine (part of the vehicle's electric power supply system) has an inconvenient location (at the bottom of the hull) which causes overheating and sometimes, jamming of the electric drive. On the other hand, the construction of the electric power supply system is very reliable. Changing the main engine oil and coolant is easy, as is replacement of fuel and oil filters, and sections of the air filter.<ref name="Soviet SPAAGs">{{cite web|url=http://www.popmech.ru/part/?articleid=1828&rubricid=7|title=Охотники за самолетами<!-- Bot generated title -->|access-date=22 May 2017|archive-url=https://web.archive.org/web/20081207153611/http://www.popmech.ru/part/?articleid=1828&rubricid=7|archive-date=7 December 2008|url-status=live}}</ref>

The ZSU-23-4 can cross vertical obstacles 0.7 m (2.3') high, trenches 2.5 m (8.2') wide, has a 1.0 m (3.3') fording depth and can climb 30° gradients.<ref name="http://otvaga2004.narod.ru/otvaga2004/wars1/wars_02.htm">[http://otvaga2004.narod.ru/otvaga2004/wars1/wars_02.htm В Боях На «Шилке»<!-- Bot generated title -->] {{webarchive|url=https://web.archive.org/web/20071225194735/http://www.otvaga2004.narod.ru/otvaga2004/wars1/wars_02.htm |date=25 December 2007 }}</ref> The ZSU-23-4 has good maneuverability and cross-country ability, but its diesel engine's power is insufficient for a vehicle of its weight. As a result, off-road acceleration capabilities are sub-par, and the vehicle lags behind MBTs and IFVs on up-hill terrain.<ref name="Soviet SPAAGs" /><ref>{{cite web|url=http://belostokskaya.ru/weapons_mp/airdefence/Shilka2/|title=Морская Пехота Балтики – ЗСУ-23-4МЗ и М2|website=belostokskaya.ru|access-date=22 May 2017|url-status=live|archive-url=https://web.archive.org/web/20171010031135/http://belostokskaya.ru/weapons_mp/airdefence/Shilka2/ |archive-date=10 October 2017}}</ref>

The ZSU-23-4 is equipped with an NBC system with an air filtration unit, fire-fighting equipment, TNA-2 navigational system, infrared vision device, R-123 radio set, R-124 intercom and electric power supply system consisting of a DGChM-1 single-shaft gas turbine engine (70&nbsp;hp at 6,000&nbsp;rpm) and a direct-current generator (which provides 27 V and 54 V direct current or 220 V 400&nbsp;Hz alternating current).<ref name="http://pvo.guns.ru/shilka/shilka.htm">{{cite web|url=http://pvo.guns.ru/shilka/shilka.htm|title=ЗСУ-23-4 "Шилка"|access-date=11 November 2014|archive-url=https://web.archive.org/web/20130723023322/http://pvo.guns.ru/shilka/shilka.htm|archive-date=23 July 2013|url-status=live}}</ref>

==Weapons and fire control==

===Turret and guns===
[[File:ZSU-23-4-Camp-Pendleton.jpg|thumb|right|Side view of a US Marine Corps ZSU at Camp Pendleton, 1997]]
Each water-cooled 23&nbsp;mm 2A7 autocannon has a cyclic rate of 850–1,000 rounds per minute for a combined rate of fire of 3,400–4,000 rounds per minute, which gives a continuous fire time of 30–35 seconds before running out of ammunition (not considering the constraints that limit the practical rate of fire, such as barrel overheating). The welded turret has a race ring transplanted from a T-54 medium tank with a 1,840&nbsp;mm (6') diametre. The 360° rotating turret is fully stabilised and capable of firing on the move. The turret rotation and autocannon elevation mechanisms provide very good speed and guidance accuracy. The hydraulically driven aiming mechanisms have been proven to be very reliable. Manual aim is used against ground targets. The quad automatic anti-aircraft gun AZP-23 "Amur" has a range of elevation from −4° to +85°. The GRAU designation for ZSU-23-4 turret with 23&nbsp;mm (0.9") AZP-23 "Amur" quad automatic gun is 2A10. An armoured plate inside the turret protects crew members from fire and explosive gas during intense firing.

===Ammunition===
[[File:Naboj23 mm.jpg|thumb|100px|23mm ammunition]]
Ammunition capacity is 2,000 rounds stowed aboard (520 rounds per each upper autocannon and 480 rounds per each lower autocannon) loaded in 50-round or shorter belts.

The water-cooled 2A7 23mm guns of ZSU-23-4 fire the same 23×152B mm caliber ammunition as the 2A14 guns of the twin-barrel ZU-23-2 towed gun. While the 23mm [[Engineering:Volkov-Yartsev VYa-23|Volkov-Yartsev VYa-23]] aircraft gun used in the Second World War era Il-2 Sturmovik also fired ammunition of the same cartridge case dimensions, the rounds differed in loading and primer, and are thus not interchangeable with the post-war AA gun ammunition.<ref name="AWilliams">Williams, Anthony G.: [http://www.quarry.nildram.co.uk/collecting%2023-28mm.htm "An introduction to collecting 23-28mm cartridges"] {{webarchive|url=https://web.archive.org/web/20101012150402/http://www.quarry.nildram.co.uk/collecting%2023-28mm.htm |date=12 October 2010 }}.</ref> Compared to the VYa and its ammunition, the air defence guns have slightly higher muzzle velocity, and explosive rounds also have slightly larger HE fillings.<ref name="rusammo">{{cite web|url=http://www.russianammo.org|title=Russian Ammunition Page|access-date=11 November 2014|url-status=live|archive-url=https://web.archive.org/web/20091019161335/http://www.russianammo.org/|archive-date=19 October 2009}}</ref> The VYa ammunition has brass cases, while 2A7/2A14 ammunition has steel cases.<ref name="AWilliams"/>

Three main types of 23mm anti-aircraft ammunition were manufactured post-war: API-T, HEI and HEI-T. In addition to the original Soviet rounds, a number of ammunition manufacturers have since begun to produce ammunition for what is still a widely used caliber; these include new ammunition types such as sub-caliber armor-piercing rounds and frangible ammunition. The following table lists the main characteristics of some of the available 23×152B mm ammunition used in 23mm AA guns:

{| class="wikitable"
|-
!width="80"| Designation
!width="60"| Type
! Projectile Weight [g]
!width="80"| Bursting charge [g]
! Muzzle Velocity [m/s]
! Description
|-
| BZT || API || align="center" | 190<ref name="rusammo"/>
| align="center" | none
| align="center" | 970  || Blunt AP steel core, with incendiary charge inside windshield cap.<ref name="rusammo" /> Penetration 15&nbsp;mm RHA at 1000 m range and 30-degree impact angle, or 25mm at 400m and 0-degree impact. Tracer burn time 5 seconds.
|-
| OFZ || HE || align="center" | 184<ref name="rusammo" />
| align="center" | 19<ref name="ORDATA">ORDATA: Ordnance Identification Tool, {{cite web |url=http://maic.jmu.edu/ordata |title=ORDATA Online: International Deminer's Guide to UXO Identification, Recovery, and Disposal |access-date=25 January 2010 |url-status=live |archive-url=https://web.archive.org/web/20080828231221/http://maic.jmu.edu/ordata/ |archive-date=28 August 2008  }}</ref>
| align="center" | 980<ref name="rusammo" /> || HE fragmentation round with nose fuzes incorporating self-destruct mechanism.<ref name="rusammo" />
|-
| OFZT || HE-T || align="center" | 188<ref name="rusammo" />
| align="center" | 13<ref name="ORDATA" />
| align="center" | 980<ref name="rusammo" /> || HE fragmentation round with a reduced HE charge due to the space taken by the tracer; tracer burn time 5 seconds.
|-
| APDS-T || APDS-T || align="center" | 103
| align="center" | none
| align="center" | 1220 || A Polish sub-caliber armour-piercing round with tracer. Penetration 30&nbsp;mm RHA at 100 m range and 30-degree impact angle (from perpendicular), tracer burn time >2.5 s.
|-
|}

A typical loading of each ammunition belt contains 40 OFZT and 10 BZT rounds.<ref name="Soviet SPAAGs" /> They can be fired to a maximum horizontal range of {{convert|7|km|mi|abbr=on}}, and a vertical range of {{convert|5.1|km|mi|abbr=on}}. The effective vertical range is {{convert|1.5|km|mi|abbr=on}} at a direct range to target of {{convert|2.5|km|mi|abbr=on}} and target speed of 250&nbsp;m/s (up to 500&nbsp;m/s if a modern fire control system is used). The usual autocannon burst consists of 3–10 projectiles and target lead angle is calculated for each burst (fire without adjustment) by computer.<ref name="http://pvo.guns.ru/shilka/shilka.htm"/> In attacking targets on the ground, its effective range is around {{convert|2.5|km|mi|abbr=on}}. The short range of its 23&nbsp;mm autocannons and relatively low explosive effect of its small-calibre projectiles mean it is less able to engage threats such as jet attack aircraft and cruise missiles than modern systems like the [[Engineering:2K22 Tunguska|2K22 Tunguska]] armed with more powerful 30&nbsp;mm autocannons and integrated missile armaments. A special 23&nbsp;mm round with composite projectiles was developed for a modern variant of SPAAG (ZSU-23-4M4) to be used against cruise missiles.

===Radar===
The RPK-2 "Tobol" a.k.a. 1RL33 radar operates in the [[Astronomy:Ku band|Ku band]] and can detect aircraft up to {{convert|20|km|mi|abbr=on}} away. It has excellent target tracking capability and is relatively hard to detect by the enemy. However, the radar picks up many false returns ([[Engineering:Radar#Clutter|ground clutter]]) under 60&nbsp;m (200&nbsp;ft) of altitude. The radar antenna is mounted on collapsible supports in the top rear of the turret. There is an optical alignment sight. The RPK-2 radar proved to have good protection against enemy passive electronic radar counter-measures. Nevertheless, the radar system of the ZSU-23-4 has a short detection range during target search, depending on weather conditions (mainly dependent on rain and snow conditions). It is hard to automatically track the target at ranges less than 7–8&nbsp;km (4.3–5.0&nbsp;mi) because of the high angular speed of the target at close distances. The radar needs to be reset quite often because of the unstable parametres of electronic [[Engineering:Cathode-ray tube|cathode-ray tube]]s of the target selection system. The absence of an automatic laser range finder requires a skillful commander and gunner.<ref name="http://www.army.lv/?s=703&id=65&v=1#info">[http://www.army.lv/?s=703&id=65&v=1#info ЗСУ-23-4 "Шилка" – Army.lv<] {{webarchive|url=https://web.archive.org/web/20081210170515/http://www.army.lv/?s=703&id=65&v=1 |date=10 December 2008 }}</ref><ref name="Soviet SPAAGs" />

===Limitations and problems===
Early versions of the ZSU-23-4 sometimes had problems with "runaway guns": after prolonged periods of firing, the guns would get so hot that chambered rounds would "cook off" even if the operator was not pulling the trigger – discharging the weapon and chambering a new round, which would then also cook off, and continue to do so. This would sometimes continue until the entire belt of ammunition had been expended. Overheating barrels could jam and even break away from the vehicle. The problem resulted from a deficient cooling system and made the early ZSU-23-4s dangerous even to friendly troops standing nearby if this happened. Despite the fact that this seldom happened, Soviet operators learned to give these machines a wide berth.(Perrett 1987:100)<ref name="http://otvaga2004.narod.ru/otvaga2004/wars1/wars_02.htm"/> It was not recommended to perform continuous fire (bursts longer than 15 seconds without pause) on earlier models until the problem with autocannon reliability and overheating during intense fire was solved on ZSU-23-4M (welded tubes of coolant outlet were replaced with flexible pipes). After the autocannon cooling system was improved, the autocannons became extremely reliable.<ref name="Soviet SPAAGs" />

The ZSU-23-4 has an 1A7 SRP electro-mechanical fire solution calculator, weighing 180&nbsp;kg, that occupies all of the space before the Commander. It contains 60 electric motors driving 110 axles over different [[Engineering:Potentiometer|potentiometre]]s, shafts, rods, [[Engineering:Cam (mechanism)|cam]]s, gears and [[Engineering:Linkage (mechanical)|linkage]]s to mechanically calculate ammunition flight time until impact, elevation lead angle, and azimuth lead angle using the target parametres received from the 1RL33 RPK-2 (gun dish) radar, and the correction angle received from the GAG (gyroscope) unit.

==Deployment==
[[File:Zsu-23-4 shilka.jpg|thumb|ZSU-23-4 at the Museum of The History of Ukraine in World War II]]
[[File:zsu23-4.jpg|thumb|right|ZSU-23-4]]
Soviet doctrine supplied the vehicle since 1965 in an anti-aircraft artillery battery of two, four-vehicle platoons for anti-aircraft defence of motor rifle and tank regiments. At the end of the 1960s one platoon was equipped with ZSU-23-4 SPAAGs while another one was still equipped with ZSU-57-2 SPAAGs. ZSU-57-2 was completely replaced with ZSU-23-4 by the beginning of the 1970s. In the 1970s, Soviet motor rifle and tank regiments were equipped with an anti-aircraft missile artillery battery consisting of two platoons, one equipped with four ZSU-23-4 SPAAGs and the other with four 9K31 Strela-1 (SA-9 Gaskin) or later with four 9K35 Strela-10 (SA-13 Gopher) short-range surface-to-air missile systems which cover the dead zones of 2K12 Kub (SA-6 Gainful) surface-to-air missile systems belonging to the divisional level. Since the 1980s Soviet motor rifle and tank regiments were equipped with an anti-aircraft artillery battalion of three batteries (one was equipped with ZSU-23-4 or 9K22 Tunguska SPAAGs, the second one was equipped with 9K35 Strela-10 (SA-13 Gopher) short-range surface-to-air missile systems and the third battery with 9K38 Igla man-portable surface-to-air missiles on IFVs or APCs.<ref name="http://pvo.guns.ru/shilka/shilka.htm"/>

The ZSU-23-4 is very vulnerable to enemy anti-tank missiles, cannons and heavy machine guns; the armour is thin (not exceeding 15&nbsp;mm) and the exposed wheels, tracks, radar, and gun barrels can easily be damaged in combat. Firing positions of ZSU-23-4 SPAAGs are typically placed near the forward edge of the battle area ([[Social:Front line|FEBA]]) but behind the main forces, usually 600–1000 m behind objectives when on the defensive or 400–600 m behind the leading tanks on the offensive. ZSU-23-4 SPAAGs are divided evenly along the troop columns on the march.

At first each ZSU-23-4 operated in combat autonomously, without target marking from regimental or divisional air defence. In 1978, the PPRU-1 (mobile reconnaissance and control post) was passed into service of the Soviet Army. The PPRU-1 ("Ovod-M-SV") vehicle is based on [[Engineering:MT-LBu|MT-LBu]] armoured tracked chassis and it was intended for control of motor rifle or tank regimental anti-aircraft unit equipped with ZSU-23-4 SPAAGs and 9K31 "Strela-1M" mobile surface-to-air missile systems. The PPRU-1 is equipped with the "Luk-23" radar and an automatic fire control system associated with the divisional air defence system.

The guns are useful against low-flying aircraft and lightly protected ground targets. Due to its effectiveness against ground targets, ZSU-23-4s have been used in urban environments (e.g., Afghanistan, [[Place:Abkhazia|Abkhazia]], Chechnya, [[Place:Syria|Syria]] and [[Place:Lebanon|Lebanon]]). This is primarily because the guns can elevate much higher than a tank or APC cannon, enabling armored units equipped with ZSU-23-4s to return fire against ambushes from above.

A small number of ZSU-23-4 SPAAGs are still in use by the Russian Naval Infantry (specifically the 61st Brigade of the Northern Fleet, the 336th Brigade of the Baltic Fleet, and the 155th Brigade of the Pacific Fleet).<ref>{{Cite news |last=Savelov |first=Alexey |date=8 April 2019 |title=Бой на фоне камчатских сопок: расчеты ЗСУ "Шилка" и ЗРК "Стрела-10" предотвратили авиаудар "противника" |language=ru |work=Zvezda TV |url=https://tvzvezda.ru/news/201904080434-q4zr.htm |access-date=1 June 2022}}</ref>

==Variants==
===Soviet Union===
* '''ZSU-23-4 "Shilka"''' (1964): pre-production and then initial production models.
* '''ZSU-23-4V "Shilka"''' (1968): modernized variant with enhanced reliability of some details, ventilation system case located on the hull. Commander vision device was added.
* '''ZSU-23-4V1 "Shilka"''' (1970): modernized variant with enhanced reliability of radar system and other details, ventilation system cases located on front bilges of the turret. Guidance-system computer was improved (as well as accuracy and efficiency of anti-aircraft fire on the move at 40&nbsp;km/h). It is fitted with a slightly improved diesel engine V-6R-1.
* '''ZSU-23-4M1''' (1973): armed with modernized [[Engineering:Autocannon|autocannon]]s 2A7M. The pneumatic loading was replaced with pyrotechnic loading (unreliable compressor was removed), welded tubes of coolant outlet were replaced with flexible pipes which increased autocannon barrel life from 3500 rounds to 4500 rounds.
*'''ZSU-23-4M3 "Biryusa"''' (1977): equipped with the "Luk" [[Identification friend or foe|IFF]] system. All ZSU-23-4M were upgraded to ZSU-23-4M3 level during scheduled repairs. Army unofficially continued to use the name "Shilka" for all variants of ZSU-23-4.
*'''ZSU-23-4M2''' (1978): so-called "Afghan" variant. Reequipment performed during the [[Religion:Soviet–Afghan War|Soviet–Afghan War]] for mountain combat. The radar system was removed and a night-sight was added. Ammunition increased from 2,000 to 4,000 rounds.

===Russian Federation and Belarus===
*'''ZSU-23-4M4''' and '''ZSU-23-4M5''' (1999): modernized variants, armed with two additional paired "Igla" [[Engineering:Man-portable air-defense system|man-portable air-defense system]]s on each side of the turret and equipped with 81mm smoke grenade launchers, laser emission sensors, electro-optical vision devices (including television system for driver) and improved weapon radar system. The mechanical transmission was replaced with hydrostatic transmission, and hydraulic boosters were installed. Mobility increased to the level of main battle tanks. This upgrade was first shown during the MAKS-99 exhibition in Zhukovsky and was carried out by the Minotor Service Enterprise and Peleng Joint Stock Company from the Republic of Belarus, and the Ulyanovsk Mechanical Plant of Russia. The Ulyanovsk Mechanical Plant is also offering ZSU-23-4 upgrade packages independently.<ref>{{cite web|url=http://articles.janes.com/articles/jdu99/ZSU-23-4M5-SHILKA-SPAAG-MODERNISATION.html |title=Defense & Security Intelligence & Analysis: IHS Jane's – IHS|access-date=11 November 2014|url-status=dead|archive-url=https://web.archive.org/web/20130320173933/http://articles.janes.com/articles/jdu99/ZSU-23-4M5-SHILKA-SPAAG-MODERNISATION.html |archive-date=20 March 2013}}</ref><ref>{{cite web|url=http://articles.janes.com/articles/Janes-Land-Based-Air-Defence/ZSU-23-4M5-Shilka-Belarus.html|title=Defense & Security Intelligence & Analysis: IHS Jane's – IHS|access-date=11 November 2014|url-status=live|archive-url=https://web.archive.org/web/20130320173933/http://articles.janes.com/articles/Janes-Land-Based-Air-Defence/ZSU-23-4M5-Shilka-Belarus.html |archive-date=20 March 2013}}</ref><ref>{{cite web|url=http://www.minotor-service.com/en/zsu-23-4-shilka.html|title=ZSU-23-4 Shilka Self-Propelled Anti-Aircraft Gun (SPAAG)|access-date=11 November 2014|url-status=live|archive-url=https://web.archive.org/web/20141110005134/http://www.minotor-service.com/en/zsu-23-4-shilka.html|archive-date=10 November 2014}}</ref>

===Ukraine===
*'''Donets''' (1999): This is a Ukrainian modernization developed by Malyshev Tank Factory in Kharkov. It has the modified turret from the ZSU-23-4, armed with two additional paired man-portable air-defense systems "Strela-10" installed on the hull of the T-80UD main battle tank. Ammunition capacity for its 23&nbsp;mm autocannons is doubled.
* '''ZSU-23-4M-A''' (2017): A modernization package developed by the Arsenal Factory in Kyiv, this system features a new Rokach-AS radar, laser rangefinder, and four automatic Igla missiles.<ref>{{cite web|url=https://defence-ua.com/index.php/en/publications/defense-express-publications/3904-new-capabilities-for-the-zsu-23-4-shilka|title=New capabilities for the ZSU-23-4 Shilka|first= Anton |last= Mikhnenko  |website=defence-ua.com|date=22 December 2017|access-date= 6 November 2022|url-status=live|archive-url=https://web.archive.org/web/20180504234158/https://defence-ua.com/index.php/en/publications/defense-express-publications/3904-new-capabilities-for-the-zsu-23-4-shilka|archive-date=4 May 2018}}</ref>

===Poland===
*'''[[Engineering:ZSU-23-4MP Biała|ZSU-23-4MP Biała]]''' (2000): Polish modernized upgrade with 4 Grom [[Engineering:Surface-to-air missile|surface-to-air missile]]s and fully digital passive aiming devices instead of the radar.<ref name="urlPoland is Looking For Technical Support for the ZSU-23-4MP Anti Aircraft Systems - Defence24.com">{{cite web |url=https://www.defence24.com/poland-is-looking-for-technical-support-for-the-zsu-23-4mp-anti-aircraft-systems |title=Poland is Looking For Technical Support for the ZSU-23-4MP Anti Aircraft Systems - Defence24.com |date=29 January 2015 |archive-url=https://web.archive.org/web/20190128084927/https://www.defence24.com/poland-is-looking-for-technical-support-for-the-zsu-23-4mp-anti-aircraft-systems |archive-date=28 January 2019 |url-status=live }}</ref><ref name="urlTłumacz Google">{{cite web |url=https://translate.google.pl/translate?hl=pl&tab=wT&sl=auto&tl=en&u=http%3A%2F%2Fwww.zmt.tarnow.pl%2Fwordpress%2Fitem%2Fprzeciwlotniczy-samobiezny-zestaw-artyleryjsko-rakietowy-zsu-23-4mp-biala%2F |title=Tłumacz Google }}</ref>

===Iran===
*'''ZSU-23-4 Soheil''' :Iranian upgrade with 4 Misagh-2 [[Engineering:Surface-to-air missile|surface-to-air missile]]s. Not much is known about it outside of its name and armament. An additional box of unknown use is visible on the rear of the turret.

===India===
* '''ZSU-23-4 upgrade''': This version was developed by Bharat Electronics Ltd (BEL) of {{wipe|India}} in cooperation with Israel Aircraft Industries (IAI). The upgraded systems will feature an advanced 3D active phased array radar<ref>{{cite web|url=http://thumkar.blogspot.ro/2014/02/schilka-zsu-23-4-upgrade.html|title=Schilka ZSU-23-4 Upgrade|website=thumkar.blogspot.ro|date=14 February 2014 |access-date=4 May 2018|url-status=live|archive-url=https://web.archive.org/web/20180504234205/http://thumkar.blogspot.ro/2014/02/schilka-zsu-23-4-upgrade.html|archive-date=4 May 2018}}</ref> and computers, electro-optical fire control systems, a new Caterpillar 359 BHP diesel engine and a new APU. The upgraded systems are able to operate despite enemy jamming, are able to pick up targets from more than 15&nbsp;km away, and functions in temperatures between 55&nbsp;°C and minus 40&nbsp;°C. The gun is able to shoot down targets flying at 450 miles per hour up to 1,500 metres and out to 2,500 metres. The purpose of the upgrade is to extend the life of the air defence system by 15 years. In December 2004 it was reported that the Indian Army awarded a US$104 million contract to upgrade its 48 ZSU-23-4 air defence systems.<ref>{{cite web|url=http://www.defensenews.com/|title=Defense News|access-date=11 November 2014|url-status=live|archive-url=http://webarchive.loc.gov/all/20110225075831/http://www.defensenews.com/ |archive-date=25 February 2011}}</ref><ref>{{cite web|url=http://defense-update.com/products/z/zsu23-4.htm|title=ZSU-23/4 Upgrade|access-date=11 November 2014|url-status=dead|archive-url=https://web.archive.org/web/20141111170045/http://defense-update.com/products/z/zsu23-4.htm|archive-date=11 November 2014}}</ref>

===Netherlands===
* '''ZSU-23-4 upgrade''' (1998): As a private venture, Hollandse Signaalapparaten company (now Thales Nederland) of the Netherlands, obtained a number of ex-East German Army ZSU-23-4V1s and developed an upgrade package. The main part of this upgrade is the modernisation of the radar and fire-control system. The first prototype was completed in mid-1998. The upgraded vehicle is equipped with the ASADS Ka-band target tracking radar and the PAGE I-band surveillance radar.<ref>{{cite web|url=http://articles.janes.com/articles/Janes-Land-Based-Air-Defence/Thales-Nederland-BV-ZSU-23-4-self-propelled-anti-aircraft-gun-upgrade-package-Netherlands.html|title=Defense & Security Intelligence & Analysis: IHS Jane's – IHS|access-date=11 November 2014|url-status=live|archive-url=https://web.archive.org/web/20130320173933/http://articles.janes.com/articles/Janes-Land-Based-Air-Defence/Thales-Nederland-BV-ZSU-23-4-self-propelled-anti-aircraft-gun-upgrade-package-Netherlands.html |archive-date=20 March 2013}}</ref>

=== Vietnam ===

* '''Improved ZSU 23-4''' (2022): A Vietnamese modernization held by the VPA Academy of Military Science and Technology (AMST), expected to be applied on Vietnam's existing ZSU-23-4M frames. This version is highly similar to Poland's [[Engineering:ZSU-23-4MP Biała|Biala]] configuration with a combination of digital and [[Engineering:Optoelectronics|optoelectronics]] devices replacing the obsolete radar, the installation of four Igla SAMs and the newly-developed digital [[Engineering:Fire-control system|fire-control system]]. The new system consist of a [[Physics:Thermographic camera|thermal camera]], a [[Engineering:Day and night camera|daylight camera]] and [[Physics:Laser rangefinder|laser rangefinder]], providing an equivalent detecting & tracking range to the original [[Engineering:Active radar homing|active sensor]]. It is claimed to have a certain integrating compability with digital radars and modern information systems.<ref>{{Cite web |last=admin |date=2022-12-15 |title=Vietnam People's Army Upgrades ZSU-23-4M Shilka Self-propelled Anti-aircraft Guns |url=https://militaryleak.com/2022/12/15/vietnam-peoples-army-upgrades-zsu-23-4m-shilka-self-propelled-anti-aircraft-guns/ |access-date=2023-03-29 |website=MilitaryLeak |language=en-us}}</ref><ref>{{Cite web |last=Viet+ Offensive |date=2022-12-10 |title=Descriptions of the Vietnamese Improved ZSU-23-4 |url=https://www.facebook.com/vietcong.offensive/photos/pb.100076116195383.-2207520000./200464942441316/ |access-date=2023-03-29 |website=[[Company:Facebook|Facebook]] |language=en}}</ref>

==Combat history==
[[File:Destroyed ZSU-23-4.JPEG|thumb|250px|Destroyed Shilka during Gulf War (1991)]]
* 1966–1989: South African Border War (Angola and Cuba)
* 1968–1970: Egypt–Israel War of Attrition (Egypt and Syria)
*1971: Indo-Pakistani war of 1971 (India)
* 1973: Yom Kippur War (Egypt and Syria)
* 1975: Vietnam War, during the last stage of Ho Chi Minh Campaign in 1975 by battery of 237th Anti-aircraft Artillery Regiment.
* 1975–1990: Lebanese Civil War (Lebanese army, Syria, various factions)
* 1975–2002: Angolan Civil War (Angola)
* 1975–1990: Western Sahara War (Polisario Front)
* 1977: Libyan–Egyptian War (Libya and Egypt)
* 1977–1978: Ogaden War (Ethiopia, Cuba and Somalia)
* 1979–1989: [[Religion:Soviet–Afghan War|Soviet–Afghan War]] (Soviet Union and Afghan National Army)
* 1980–1988: Iran–Iraq War (Iran and Iraq)
* 1982: Lebanon War (PLO and Lebanese Army)
* 1986: Operation El Dorado Canyon (Libya)<ref>{{cite web | url =https://www.thefreelibrary.com/A+Soviet+look+at+Eldorado+Canyon%3a+Soviet+sources+say+April+1986+US...-a0126318182 | title =A Soviet look at Eldorado Canyon: Soviet sources say April 1986 US raid on Libya revealed incompetence rather than technical failings. |journal=Journal of Electronic Defense 
 | last =Fiszer | first =Michal | date =1 October 2004 |via =The Free Library | publisher = | access-date =12 Nov 2021 | quote =The second "Karma" aircraft was much less lucky. It was hit--by a ZSU-23-4 Shilka, according to Soviet sources (US sources, though, claim it was hit by a SAM)--and crashed in the sea. }}</ref>
* 1990: Gulf War (Iraq and Egypt)
* 1990–1994: First Nagorno-Karabakh War (Armenia and Azerbaijan)
* 1992–1993: Georgian–Abkhazian conflict
* 1994–1996: First Chechen War (Russia, Chechen forces)
* 1999: Second Chechen War (Russia)
* 2003: 2003 invasion of Iraq (Iraq)
* 2008: Russo-Georgian War (Russia)
* 2009–present: Boko Haram insurgency<ref>{{cite news|title=EXCLUSIVE: Lt. Col. Abu Ali's Death: Why Boko Haram is killing more Nigerian soldiers – Top Military Officer|newspaper=Premium Times|date=7 November 2016|url=https://www.premiumtimesng.com/news/headlines/214716-exclusive-lt-col-abu-alis-death-boko-haram-killing-nigerian-soldiers-top-military-officer.html|access-date=1 October 2018|archive-url=https://web.archive.org/web/20181002020437/https://www.premiumtimesng.com/news/headlines/214716-exclusive-lt-col-abu-alis-death-boko-haram-killing-nigerian-soldiers-top-military-officer.html|archive-date=2 October 2018|url-status=live}}</ref> (Nigeria)
* 2011: Libyan Civil War (Pro-Gaddafi and Anti-Gaddafi forces)
* 2011–present: Syrian Civil War (Government forces, Rebel forces and ISIS)
* 2014–present: Russo-Ukrainian War (Ukrainian Army)<ref>[https://www.osce.org/special-monitoring-mission-to-ukraine/372601 Latest from the OSCE Special Monitoring Mission to Ukraine (SMM), based on information received as of 19:30, 15 February 2018] {{webarchive|url=https://web.archive.org/web/20180329220654/https://www.osce.org/special-monitoring-mission-to-ukraine/372601 |date=29 March 2018}}, "In government-controlled areas, the SMM saw two anti-aircraft guns (ZU-23) on the western outskirts of Avdiivka, two IFVs (one BMP-2 and one BMP-variant) near Bohdanivka and five IFVs (two BMP-1 and three BMP-variant), two armoured reconnaissance vehicles (BRDM-2) and an anti-aircraft gun (ZSU-23-4 Shilka, 23mm) in Popasna."</ref>
** 2022: Russian Invasion of Ukraine (Ukraine and Russian forces)

==Operators==
[[File:ZSU-23-4 operators.png|thumb|400px|Map of ZSU-23-4 operators in blue with former operators in red]]

===Current operators===
{{incomplete list|date=November 2021}}
* {{flag|Afghanistan}}: 20 were delivered from USSR.<ref name="militaryparitet">{{cite web|url=http://www.militaryparitet.com/nomen/russia/arty/sarty/data/ic_nomenrussiaartysarty/14/|title=5. ЗЕНИТНЫЕ САМОХОДНЫЕ УСТАНОВКИ (ЗСУ) – Военный паритет|website=www.militaryparitet.com|access-date=22 May 2017|url-status=live|archive-url=https://web.archive.org/web/20170728202516/http://www.militaryparitet.com/nomen/russia/arty/sarty/data/ic_nomenrussiaartysarty/14/|archive-date=28 July 2017}}</ref><ref name="Janes">{{Cite web|url=http://www8.janes.com/Search/documentView.do?docId=/content1/janesdata/yb/jlad/jlad0057.htm |title=ZSU-23-4 |access-date=8 November 2008 |date=30 October 2008 |publisher=Jane's Information Group }}</ref>
* {{flag|Algeria}}: 210 in 1995.<ref name="Janes" /><ref name="WDA">The World Defence Almanac 1995–1996. Military Technology. 1996</ref> According to another sources 310 were delivered from USSR.<ref name="militaryparitet"/>
* {{flag|Angola}}: 20+ were delivered from USSR.<ref name="militaryparitet"/><ref name="Janes" />
* {{flag|Armenia}}<ref name="auto">International Institute for Strategic Studies. ''The Military Balance 2012''. London: Routledge, 2012, p. 90.</ref>
* {{Flag|Azerbaijan}}<ref name="mb2016">{{cite journal |author=International Institute for Strategic Studies (IISS) |date=14 February 2022 |title=The Military Balance 2022 |journal=The Military Balance |language=en |volume=122 |pages= |doi=10.1080/04597222.2022.2022930 |doi-access=free}}</ref>{{Rp|pages=182–183}}
* {{flag|Cameroon}}: 200 ordered from Russia.<ref name="WDA"/> 128 were delivered from Russia, but a new contract was certified with Russia in 2011 for 300–350.<ref name="http://warfare.be/?lang=&catid=240&linkid=1569">[http://warfare.be/?lang=&catid=240&linkid=1569 ZSU Shilka self-propelled ADGM<!-- Bot generated title -->]</ref>
* {{flag|Congo-Brazzaville}}: 8<ref name="Janes" />
* {{flag|Cuba}}: 36 in 1995 (delivered from Russia).<ref name="militaryparitet"/><ref name="Janes" /><ref name="WDA"/>
* {{flag|Egypt}}: 350 in 1970.<ref name="WDA"/> New 330 units were delivered from USSR, also a new contract was signed with Russia in 2005.<ref name="militaryparitet"/>
* {{flag|Ecuador}}: 34 from Nicaragua in 1997.<ref name="Janes" />
* {{flag|Eritrea}}<ref name=IISS>{{cite book |last=International Institute for Strategic Studies|date=2021|title=The Military Balance|page=464|isbn=9781032012278}}</ref>
* {{flag|Ethiopia}}: 60<ref name="Janes" />
* {{flag|Guinea-Bissau}}: 16 were delivered from USSR.<ref name="militaryparitet"/>
* {{flag|India}}: 100 were delivered from USSR.<ref name="militaryparitet"/><ref name="Janes" />
* {{flag|Iran}}: 100+<ref name="Janes" />
* {{flag|Iraq}}: 200+<ref name="Janes" />
* {{flag|Jordan}}: 16 in 1995 (delivered from USSR).<ref name="militaryparitet"/><ref name="WDA"/> 45 in 2008.<ref name="Janes" />
* {{flag|Kyrgyzstan}}: 24 in 2022.<ref name="mb2016" />{{Rp|page=190}}
* {{flag|Kurdistan}}: 6 in Service.<ref>{{cite news |last1=Litovkin |first1=Nikolai |title=Russia delivers first weapons supplies to Iraqi Kurds |url=https://www.rbth.com/defence/2016/03/18/russia-delivers-first-weapons-supplies-to-iraqi-kurds_576809 |access-date=3 July 2019 |work=Russia Beyond |date=18 March 2016}}</ref>
* {{flag|Laos}}: 10+<ref name="Janes" />
* {{flag|Libya}}: 250<ref name="Janes" />
* {{flag|Mali}}: 3 or 4 in 2013.<ref>{{cite news|title=Armée malienne : le difficile inventaire|trans-title=Malian Army: The difficult inventory|language=fr|url=https://www.jeuneafrique.com/170176/politique/arm-e-malienne-le-difficile-inventaire/|work=Jeune Afrique|first=Laurent|last=Touchard|date=18 June 2013|access-date=13 January 2019|archive-url=https://web.archive.org/web/20190408142653/https://www.jeuneafrique.com/170176/politique/arm-e-malienne-le-difficile-inventaire/|archive-date=8 April 2019|url-status=live}}</ref>
* {{flag|Mongolia}}<ref name="Janes" />
* {{flag|Nigeria}}: 30<ref name="Janes" />
* {{flag|Poland}}: 28 in 2015.<ref name="Dziennikzbrojny.pl">{{cite web |title=Technical support anti-ZSU-23-4MP BIAŁA |url=http://dziennikzbrojny.pl/aktualnosci/news,1,8659,aktualnosci-z-polski,wsparcie-techniczne-przeciwlotniczych-zsu-23-4mp-biala |url-status=live |archive-url=https://web.archive.org/web/20150402110701/http://dziennikzbrojny.pl/aktualnosci/news,1,8659,aktualnosci-z-polski,wsparcie-techniczne-przeciwlotniczych-zsu-23-4mp-biala |archive-date=2 April 2015 |publisher=Dziennikzbrojny.pl |accessdate=2015-09-04 |df=dmy-all}}</ref> 150 were delivered from USSR until 1991.<ref name="militaryparitet"/> Most of them will be modernized to [[Engineering:ZSU-23-4MP Biała|ZSU-23-4MP Biała]] standard.<ref name="Dziennikzbrojny.pl"/> Some were donated to Ukraine.<ref>{{Cite web |date=2023-03-27 |title=Polskie systemy ZSU-23-4 Szyłka w Ukrainie. Chronią tamtejsze niebo |url=https://tech.wp.pl/polskie-systemy-zsu-23-4-szylka-w-ukrainie-chronia-tamtejsze-niebo,6880945856887584a |access-date=2023-06-24 |website=WP Tech |language=pl}}</ref>
* {{flag|Russia}}: ~133 in active service in 2011 (used by Marines).<ref name="http://warfare.be/?lang=&catid=240&linkid=1569"/> Reduced to 60 in Naval Infantry by 2022.<ref name="mb2016" />{{Rp|pages=199–200}}
* {{flag|Sahrawi Arab Democratic Republic}}<ref>{{cite book |last1=Cooper |first1=Tom |last2=Grandolini |first2=Albert |last3=Fontanellaz |first3=Adrien |title=Showdown in Western Sahara, Volume 2: Air Warfare Over the Last African Colony, 1975-1991 |date=2019 |publisher=Helion & Company Publishing |location=Warwick, UK |isbn=978-1-912866-29-8 |page=70}}</ref>
* {{flag|Syria}}: 400 were delivered from USSR.<ref name="militaryparitet"/><ref name="Janes" />
** Kurdish People's Defense Units (YPG)<ref>{{cite web |last1=Mitzer |first1=Stijn |last2=Oliemans |first2=Joost |title=Kurdish Armour: Inventorising YPG Equipment In Northern Syria |url=https://www.oryxspioenkop.com/2021/10/kurdish-armour-inventorising-ypg.html |website=Oryx Blog |date=29 October 2021}}</ref>
* {{flag|Turkmenistan}}: 28, in service as of 2016.<ref name="Janes" /><ref>{{cite web|author1=Hərbi TV|title=Turkmenistan Military Parade 2016|url=https://www.youtube.com/watch?v=zkGQUCXgeD0|website=YouTube|access-date=7 August 2017|location=Ashgabat|language=tk|date=31 October 2016|url-status=live|archive-url=https://web.archive.org/web/20171015160440/https://www.youtube.com/watch?v=zkGQUCXgeD0|archive-date=15 October 2017}}</ref> IISS reported 48 as of 2022.<ref name="mb2016" />{{Rp|pages=209–210}}
* {{flag|Ukraine}}<ref name="Janes" />
* {{flag|Vietnam}}: 100<ref name="Janes" />
* {{flag|Yemen}}: 30<ref name="Janes" /> to 40 in 1995 (delivered to South Yemen from USSR).<ref name="militaryparitet"/><ref name="WDA"/>

===Former operators===
* {{flag|East Germany}}: 131 were delivered from USSR, passed on to Germany after the German reunification.<ref name="militaryparitet"/>
* {{flag|Germany}}: Passed on from East Germany, decommissioned.
* {{Flag|Hungarian People's Republic|1949}}: 22 operated from 1969-1990.<ref>{{Cite web |title=ZSU-23-4V1 Shilka Simulator Manual  |url=https://www.scribd.com/document/181141339/ZSU-23-4V1-Shilka-Simulator-Manual |access-date=2023-08-31 |website=Scribd |page=4 |language=en|url-access =subscription}}</ref>
* {{Flag|Hungary}}: Passed on from the Hungarian People's Republic, decommissioned in 1990.
* {{flaglist|ISIL}}: Operated small numbers captured from Syrian army. Likely no units are still in service. 
* {{flaglist|Israel}}: 60 captured from Arab armies over the Arab-Israeli conflict, and used for air defense.<ref name="Janes" /> Currently out of service.
* {{flag|Lebanon}}: ex-PLO vehicles operated by the Lebanese Army (2),<ref>Zaloga, ''ZSU-23-4 Shilka & Soviet Air Defense Gun Vehicles'' (1993), pp. 35-36.</ref> Lebanese Forces (3), Al-Mourabitoun (3),<ref>{{cite web|url=http://forum.tayyar.org/f8/army-lebanon-36023/index7.html |title=The Army of Lebanon - Page 7 - the Orange Room - forum.tayyar.org |access-date=2011-03-24 |url-status=dead |archive-url=https://web.archive.org/web/20110727163220/http://forum.tayyar.org/f8/army-lebanon-36023/index7.html |archive-date=2011-07-27 }} – information on al-Murabitoun 'Shilka' vehicles.</ref><ref>Yann Mahé, ''La Guerre Civile Libanese, un chaos indescriptible! (1975-1990)'', Trucks & Tanks Magazine n.º 41, January–February 2014, {{ISSN|1957-4193}}, p. 81.</ref><ref>Kassis, ''Invasion of Lebanon 1982'' (2019), pp. 201; 203.</ref><ref>Sex & Abi-Chahine, (2021), p. 194.</ref> Amal Movement (3 seized from the Al-Mourabitoun),<ref>Sex & Bassel Abi-Chahine (2021), p. 194.</ref> and People's Liberation Army (2 loaned by Libya)<ref>Abi-Chahine, (2019), p. 72.</ref> during the Lebanese Civil War from 1983 to 1990. Currently out of service.
* {{flag|Moldova}}:<ref name="auto" /> Retired by 2022.<ref name="mb2016" />{{Rp|pages=191–192}}
* {{flag|Nicaragua}}: Sold to Ecuador.
* {{flagicon|Palestine}} Palestine Liberation Organization: 8 were delivered from USSR and Hungary to PLO guerrilla factions operating in Lebanon, passed on to local militias.
* {{flag|South Yemen}}<ref name="militaryparitet"/><ref name="WDA"/>
* {{flag|Soviet Union}}: Passed on to successor states.

==See also==
* [[Engineering:2K22 Tunguska|2K22 Tunguska]]
* M163 VADS
* M247 Sergeant York
* [[Engineering:SIDAM 25|SIDAM 25]]
* [[Engineering:KS-23|KS-23]], an enormous-caliber Russian shotgun, made from rejected ZSU-23-4 barrels
* Korkut
* [[Engineering:Flakpanzer Gepard|Flakpanzer Gepard]]

==Notes==
{{Reflist|30em}}

==References==
{{refbegin|30em}}
* {{cite book|last=Abi-Chahine |first=Bassel |title=The People's Liberation Army through the eyes of a lens, 1975–1991 |publisher=Éditions Dergham |publication-place=Jdeideh (Beirut) |date=2019 |isbn=978-614-459-033-1}}
* {{cite book|last=Kassis |first=Samer |title=Invasion of Lebanon 1982 |publisher=Abteilung 502 |date=2019 |isbn=978-84-120935-1-3 |url=https://play.google.com/books/reader?id=G2y3DwAAQBAJ&hl=pt_PT&pg=GBS.PA381}}
* {{Cite book
  | last = Koll
  | first = Christian
  | title = Soviet Cannon: A Comprehensive Study of Soviet Arms and Ammunition in Calibres 12.7mm to 57mm
  | publisher = Christian Koll
  | date = 2009
  | publication-place = Linz, Austria
  | url = http://www.russianammo.org
  | oclc = 424511896
  | isbn = 978-3-200-01445-9}}
* {{cite book|last=Perrett |first=Bryan |date=1987 |title=Soviet Armour Since 1945 |publication-place=London |publisher=Blandford Press |isbn=0-7137-1735-1 |oclc=19847519}}
* {{cite book|last1=Sex |first1=Zachary |last2=Abi-Chahine |first2=Bassel |title=Modern Conflicts 2 – The Lebanese Civil War, From 1975 to 1991 and Beyond |series=Modern Conflicts Profile Guide |volume=II |publisher=AK Interactive |date=2021 |id={{EAN|8435568306073}}}}
* {{citation |last=Shirokorad |first=A. |date=February 1998 |work=Bronekollektsiya |title="Shilka" i drugie otechestvennye ZSU |trans-title="Shilka" and Other Native SPAAGs |language=ru}}
* {{cite book|first=Mike |last=Guardia |others=illustrated by Henry Morshead |title=Self-Propelled Anti-Aircraft Guns of the Soviet Union |series=New Vanguard No. 222 |publisher=Osprey Publishing |location=Oxford |date=2015 |isbn=9781472806222}}
* Zaloga, Steve [Steven J.] (1993). ''ZSU-23-4 Shilka & Soviet Air Defense Gun Vehicles''. Hong Kong: Concord Publications. {{ISBN|962-361-039-4}}. {{oclc|48683481}}.
{{refend}}

==External links==
{{Commons|ZSU-23-4 Shilka}}
* [https://fas.org/man/dod-101/sys/land/row/zsu-23-4.htm Federation of American Scientists page]
* [http://www.gulflink.osd.mil/irfna/irfna_refs/n28en143/airdef.html GulfLINK: Soviet air defence vehicles] {{Webarchive|url=https://web.archive.org/web/20171010031136/http://www.gulflink.osd.mil/irfna/irfna_refs/n28en143/airdef.html |date=10 October 2017 }}
* [http://armyinrussian.narod.ru/suhoputnie/shilka.htm In Russian. Description and photos]
* [http://pvo.guns.ru/shilka/shilka.htm In Russian. Short info and several photos]
* [http://oficery.ru/2007/11/20/zenitnaja_samokhodnaja_ustanovka__zsu234_shilka.html In Russian. Description, specifications, photos]
* [https://web.archive.org/web/20071225194735/http://www.otvaga2004.narod.ru/otvaga2004/wars1/wars_02.htm In Russian. ZSU-23-4 during the Soviet War in Afghanistan]

{{PostWWIISovietAFVS|SA}}

{{DEFAULTSORT:Zsu-23-4}}
[[Category:Self-propelled anti-aircraft weapons]]

{{Sourceattribution|ZSU-23-4 Shilka}}