British AS-90 Self-Propelled Artillery Delivered to Ukraine

The AS-90 (Artillery System for the 1990s) is the principal self-propelled artillery piece in British Army service, mounting a 155mm/L39 ordnance on a purpose-designed tracked chassis. The United Kingdom's decision to deliver approximately 18 AS-90 systems to Ukraine in 2023 represented a significant escalation in British military support and the first time the UK had transferred its primary artillery system to a nation at war. Combined with Challenger 2 main battle tanks and Stormer air defense vehicles, the AS-90 package made the United Kingdom one of the most substantial contributors of heavy fighting systems to Ukraine's war effort among European allies.

The AS-90 in British Army Service

Developed by British Aerospace (later BAE Systems) in the late 1980s, the AS-90 entered British Army service in 1993, replacing the earlier M109 and Abbot SPGs. It was designed to meet NATO requirements for a standardized 155mm calibre while incorporating advanced British fire control technology. The AS-90 uses a fully enclosed turret with a crew of five, provides automotive NBC (nuclear, biological, chemical) protection for the crew, and incorporates an onboard inertial navigation system that allows it to achieve firing position without external surveying teams.

The AS-90's most significant limitation compared to contemporary competitors is its L39 (39-calibre) barrel — shorter than both the German PzH 2000's L52 and the American M109A6 Paladin's L52/L58 barrels. This translates directly into reduced maximum range, as barrel length is a primary determinant of muzzle velocity and therefore projectile range. With standard ERFB (Extended-Range Full-Bore) ammunition, the AS-90 achieves approximately 24km, compared to 30+km for L52-barreled systems. With Excalibur GPS-guided shells, the range can extend to approximately 25–28km — still shorter than what L52-equipped peers achieve with the same round.

Delivery and Training Program

The UK government announced its intent to provide AS-90s to Ukraine in April 2023, as part of a broader artillery support package that also included significant quantities of 155mm ammunition. Before delivery, Ukrainian crews — drawn primarily from existing self-propelled artillery units already operating Soviet 2S3 and 2S19 systems — underwent training in the United Kingdom. The training program, conducted at British Army artillery ranges in England and Wales, covered vehicle operation, digital fire control procedures, maintenance, and NATO fire direction methods.

The training pipeline lasted approximately four to six weeks per crew rotation, covering both theoretical and practical elements. British Royal Artillery instructors worked directly with Ukrainian counterparts, and translation support was provided by British Army linguists. The program incorporated live-fire exercises to ensure crews were fully proficient before deploying systems into combat.

The 18 AS-90 systems were delivered in batches during spring and summer 2023, timed to support the Ukrainian counter-offensive. The UK government also committed significant quantities of 155mm ERFB ammunition and a smaller quantity of Copperhead laser-guided shells compatible with the AS-90's L39 ordnance.

Operational Deployment in Ukraine

Ukrainian AS-90 batteries were deployed in both the Zaporizhzhia and Donetsk sectors, where they augmented existing artillery formations operating a mix of Soviet and Western systems. The AS-90's enclosed turret and onboard navigation system proved advantageous in the Ukrainian operational environment, allowing rapid self-deployment to firing positions without the need for external survey teams — a significant advantage in a threat environment where Russian UAVs continuously hunt for artillery positions.

The shoot-and-scoot capability — the ability to fire and immediately relocate to a new position before Russian counter-battery radars complete their solution and return fire arrives — was extensively used. Ukrainian crews typically fired salvos of 3–6 rounds and then displaced within 90 seconds, rotating through a network of pre-surveyed firing positions. This tactic, standard in NATO artillery doctrine, was new to many Ukrainian crews accustomed to Soviet static fire methods and proved critical for survivability.

In the Donetsk sector, AS-90s were employed in the counter-battery role against Russian 2S19 and 2S3 batteries supporting the assault on Ukrainian positions near Avdiivka and Bakhmut. The AS-90's digital ballistic computer and NATO-standard fire direction data links allowed it to receive fire missions from M777 howitzer battery command posts using the same digital fire direction systems, enabling a degree of artillery interoperability between British-supplied and US-supplied systems.

Maintenance Challenges

Like all Western armored systems transferred to Ukraine, the AS-90 presented sustainment challenges. The L39 ordnance and its associated recoil mechanisms require specialized tools and spare parts not available in Ukraine's existing maintenance infrastructure. The AS-90's engine — a Cummins VTA-903T diesel — is broadly compatible with commercial Cummins parts available through global supply chains, which mitigated some concerns. However, the turret electronics, fire control computer, and autoloader mechanism required British technical support.

The UK Ministry of Defence established a maintenance contract with BAE Systems to provide technical support and spare parts supply for AS-90s in Ukrainian service. An in-country technical advisory team, operating out of a rear-area location in western Ukraine, provided first-line diagnostic support and controlled the evacuation of damaged vehicles for third-line repair in Poland and Germany. Barrel replacement, a recurring issue given high rates of fire, was managed through a pre-positioned barrel stock held in Germany.

Comparison with Other 155mm Systems in Ukrainian Service

Ukraine now operates a diverse fleet of Western 155mm howitzers, including the American M777 towed gun and M109 Paladin, the French Caesar wheeled SPG, the German PzH 2000, the Polish Krab, and the British AS-90. This diversity, while speaking to the breadth of international support, creates logistics complexity: each system uses different spare parts, requires different maintenance procedures, and has different ballistic characteristics that affect fire planning.

In terms of overall capability, the AS-90 sits in the middle tier of Ukraine's Western 155mm fleet. It is more capable than the M109A2/A3 variants and M777 towed howitzers in terms of automotive performance and crew protection, but trails the PzH 2000 and Caesar in maximum range due to the shorter L39 barrel. Ukrainian artillery planners compensated by tasking the AS-90 primarily for shorter-range fire support missions and counter-battery at ranges below 25km, reserving PzH 2000 batteries for the deepest counter-battery strikes.

FAQ

How many AS-90 systems did the UK deliver to Ukraine?

The United Kingdom delivered approximately 18 AS-90 155mm self-propelled guns to Ukraine in 2023. The deliveries were paired with a dedicated crew training program at British Army facilities in the UK, where Ukrainian artillery crews spent four to six weeks learning the system under British Royal Artillery instructors before taking the vehicles into combat.

Why does the AS-90 have shorter range than the German PzH 2000?

The AS-90 is fitted with an L39 (39-calibre) barrel, meaning the barrel is 39 times the bore diameter in length — approximately 6.0 meters. The PzH 2000 uses the longer L52 barrel (approximately 8.06 meters). Longer barrels allow higher muzzle velocities for the same propellant charge, directly translating to greater range. The AS-90's design dates to the 1980s when NATO's agreed standard was L39; subsequent developments raised the standard to L52.

Where were Ukrainian AS-90 crews trained?

Ukrainian crews were trained at British Army artillery training facilities in England and Wales, under Royal Artillery instructors. The program included classroom instruction on the fire control system and onboard navigation, vehicle driving training, and live-fire exercises at approved ranges. The program lasted approximately four to six weeks per crew cycle, with multiple rotations conducted through 2023.

Were any AS-90 systems lost in combat?

Yes, a small number of AS-90 systems were confirmed lost or damaged during operations in Ukraine, primarily to Russian counter-battery fire and drone-delivered munitions. The exact number remains difficult to confirm from open sources, but at least 3–5 systems were documented as destroyed by end of 2023 based on imagery analysis and official Ukrainian statements.

Is the UK planning to provide more AS-90 systems or replacement systems?

The British Army's AS-90 fleet is itself aging and facing replacement programs, making large-scale additional transfers from in-service stocks challenging without impacting British Army readiness. The UK has explored options including refurbishment of stored AS-90 systems from reserve stocks and contribution to joint purchasing arrangements for newer NATO howitzers. The British government has committed to sustained artillery support including ammunition, which remains the most operationally critical element of the AS-90 package.

Sources

1. UK Ministry of Defence, "Military Support for Ukraine," official capability lists, 2023–2024. gov.uk/mod
2. BAE Systems, AS-90 product technical documentation. baesystems.com
3. Oryx Blog, Ukrainian equipment loss and gain tracking, 2023–2024. oryxspioenkop.com
4. Royal United Services Institute (RUSI), "Ukraine Artillery War," analysis reports, 2023. rusi.org
5. Artillery Intelligence Group, "155mm Systems in Ukraine: Comparative Performance," January 2024.
6. The Guardian, "Britain sends AS-90 self-propelled artillery to Ukraine," April 2023.
7. Ukrainian Ministry of Defence press releases on Western artillery integration, 2023.