The YuRom Project: One Jet Fighter, Two Different Fates

The Soko J-22 Orao (Yugoslavia) and the IAR-93 Vultur (Romania) were twin-engine, subsonic ground-attack and reconnaissance aircraft. Jointly developed in the 1970s, they represented the industrial and military independence of both nations from the Soviet bloc; Yugoslavia and Romania signed an agreement to share costs and engineering under the codename “Project YuRom” (Yugoslavia-Romania) with the shared objective of creating a light tactical fighter capable of replacing Soviet ground-attack aircraft and operating from short or improvised dirt runways.

Introduction: The Tale of Two Communist Nations

In the 1970s, two communist countries decided to do something unusual: build a jet fighter together without Soviet permission or involvement. Romania and Yugoslavia partnered to create a ground attack aircraft that would be built in both countries under two different names. Romania called it the IAR-93 and Yugoslavia called it the J-22 Orao, meaning eagle. It was the same aircraft developed jointly, manufactured in parallel. Romania built over 165 of them, Yugoslavia built around 190, and both air forces flew them for decades.

But the story didn’t end the same way in both countries. The Romanian IAR-93s were mostly retired quietly, their combat record limited to a chaotic few days during the 1989 revolution. The Yugoslav J-22s, however, saw extensive combat during the Yugoslav wars of the 1990s, flying ground attack missions until NATO intervened and destroyed many of them on the ground. This is the story of the IAR-93 and the J-22 Orao, the jet that two countries built together and how it fought in two very different wars.

Geopolitical Context: Escaping the Soviet Shadow

Relations between Yugoslav leader Josip Broz Tito and Romania were marked by strong ties of mutual cooperation and political independence from the Soviet Union, especially during the Cold War in the 1960s and 1970s.

By the late 1960s, both Romania and Yugoslavia had a problem. They needed a modern ground attack aircraft, but neither country wanted to be completely dependent on the Soviet Union for military equipment.

The Yugoslav Partisans succeeded in driving Axis forces out of Serbia in 1944 and out of the rest of Yugoslavia in 1945. With this success, Josip Broz Tito reunified Yugoslavia. However, Stalin did not want strong, charismatic leaders in the newly established communist countries of Europe. He turned all of them into satellites of the USSR. This aggressive policy triggered the Yugoslav-Soviet split. Despite the communist regime, Tito established good relations with the West.

The Yugoslavia was officially non-aligned, walking a tightrope between East and West during the Cold War. They couldn’t rely on Soviet aircraft, and Western countries weren’t exactly eager to sell cutting-edge military technology to a communist state.

In the 1960s, the Romanian Air Force was under strong Soviet influence and was part of the Warsaw Pact. Its inventory consisted predominantly of Soviet-origin aircraft, such as Mikoyan-Gurevich MiG-17, MiG 19, MiG-21(F-13) and Ilyushin Il-28. Training and transport aircraft models such as the Yak-18 and Soviet-made twin-engine utility transport aircraft provided logistical support and pilot training.

Romania’s situation was different from Yugoslavia’s but led to the same conclusion. Under Nicolae Ceaușescu, Romania remained in the Warsaw Pact but pursued an increasingly independent foreign policy. Ceaușescu wanted Romania to have its own indigenous defense industry rather than simply importing Soviet equipment like most Eastern Bloc countries and he established good relations with the West. Both countries had aircraft industries with some experience. Romania manufactured the IAR-80C, IAR-80C (DB 605), and IAR-81, fighter-bombers of excellent performance used during World War II.

Yugoslavia already possessed a more solid and reasonably efficient aeronautical industry. The former Ikarus aircraft factory manufactured the Ikarus Aero 2 was a piston-engined military trainer aircraft built in Yugoslavia in the years following World War II, although the design pre-dated the war.

Another manufacturer we should highlight is Utva Aviation Industry, Utva was established in Zemun on 5 June 1937. It initially produced simple gliders. In 1939, Utva expanded its production to include light piston engine aircraft. Since 1940, it has been headquartered in Pančevo. Utva manufactured the UVA Aero 3 was a piston-engined military trainer aircraft built in Yugoslavia to replace the Ikarus Aero 2 then in service. One hundred ten were built, in Yugoslav Air Force service from 1958 to mid-1970s.

During 1964, production of the G-2 Galeb commenced, making it the first indigenously-developed jet aircraft to enter mass production in Yugoslavia (the first jet-powered plane built by Yugoslavia was the Ikarus 451M in 1952, which did not enter mass-production). A ground attack-oriented derivative of the Galeb, named the J-21 Jastreb, was also developed shortly thereafter; Apart from the strengthening of the airframe, one distinct difference between the two aircraft was the deletion of the rear cockpit on the J-21 Jastreb, this location has instead been covered by a fairing and the internal space used to contain avionics and other aircraft equipment. Beyond domestic adoption with the Yugoslav Air force, the Galeb achieved export sales as well; the Libyan Air Force. It left a significant mark on the country’s aviation.

Yugoslavia had built trainers and light aircraft like UTVA-66, a robust, domestically manufactured utility aircraft used for support and light transport and Zlin Z.526M, acquired from Czechoslovakia for basic training at the Military Aviation Academy, but neither had ever designed and built a modern jet fighter from scratch.

The YuRom Alliance: Shared Engineering and Manufacturing

In 1970, Romania and Yugoslavia signed an agreement to jointly develop a new subsonic ground attack and tactical reconnaissance aircraft. The project would be called YuRom, a combination of Yugoslavia and Romania. The concept made sense: by sharing development costs and producing the aircraft in both countries, they could build something neither could afford alone. Each country would manufacture components, and final assembly would happen in parallel—in Romania at IAR (Industria Aeronautică Română) in Bucharest, and in Yugoslavia at Soko in Mostar.

Design work began in 1970. The aircraft would be a twin-engine, single-seat or two-seat ground attack jet optimized for close air support and tactical reconnaissance. It needed to be simple enough to manufacture with the industrial capabilities both countries had, rugged enough to operate from rough airfields, and capable enough to be effective in combat. The design that emerged looked similar to other ground attack aircraft of the era: a straight-wing jet with two engines, shoulder-mounted wings, and a sturdy airframe designed to take damage and keep flying. It wasn’t trying to be a cutting-edge fighter; it was meant to be a practical, affordable workhorse that could support ground forces.

Upgrading the Engines and Serial Production

The first prototype flew on October 31st, 1974, in Romania. The Yugoslav prototype followed shortly after. Flight testing revealed that the aircraft was underpowered. The Rolls-Royce Viper engines available at the time didn’t provide enough thrust for the aircraft’s weight. This led to the development of an improved version with more powerful engines. The upgraded aircraft flew in 1977, and this became the standard production version.

Romania designated it the IAR-93, while Yugoslavia called it the J-22 Orao. Same aircraft, two names, two production lines. By 1979, both countries were producing the aircraft. Romania planned to build them to replace aging Soviet-designed aircraft in their inventory, and Yugoslavia intended to use them as the backbone of their ground attack capability. Both planes entered service in the early 1980s, with both countries also producing single-seat and two-seat variants. The two-seaters could be used for training, tactical reconnaissance, or as a more capable ground attack platform with a weapons officer in the back seat.

Technical Specifications and Weapon Capabilities

The production version of the aircraft was powered by two Rolls-Royce Viper Mk 632-41 turbojet engines, each producing around 4,000 lbs of thrust with afterburner. This gave the aircraft a maximum speed of around 550 knots at sea level. For armament, both had two 23 mm GSh-23L cannons built into the fuselage. They also had hardpoints for external stores—five in total. These could carry bombs, rocket pods, drop tanks for extended range, or, in later versions, air-to-air missiles for self-defense.

Despite initially having the same basic armament, some modifications were made to both aircraft over the years.

IAR-93A and IAR-93B

Hardpoints: up to 2,500 kg (5,511 lb) on 5 pylons.

J-22A and J-22B

Hardpoints: 5 (4 under the wings and 1 central)

J-22M1A

In addition to the weaponry mentioned above, this version features a combination of much more modern armaments.

Above, a J-22M1A with new paint job at Batajnica airbase during the Saint Elijah, the Aviation Day in Serbia.

Structural characteristics:

• The aircraft was designed to operate from austere airfields. It had a robust landing gear and could take off from damaged or unpaved runways. 
• The engines were positioned high on the fuselage, reducing the risk of foreign object damage from debris kicked up during takeoff and landing. 
• The cockpit was relatively simple by Western standards, but functional. The avionics weren’t cutting-edge, but they didn’t need to be for the close air support role. The J-22M1A version was fitted with a modern digital glass cockpit.
• The aircraft was meant to fly low, find targets visually or with basic sensors, and attack with guns, rockets, or bombs. The J-22M1A version features much more modern sensors in its digital glass cockpit.

The Production Numbers of Both Fleets

Romania produced the aircraft at a steady pace through the 1980s. By the time production ended in the 1990s, Romania had built approximately 165 IAR-93s in various versions, including the A model (the initial production model), the improved B model with better engines and systems, and a two-seater DC trainer variant.

Yugoslavia built around 190 J-22s, including the initial J-22 Orao 1 and the upgraded J-22 Orao 2 with improved avionics. Like Romania, they produced both single-seat and two-seat versions. The YuRom Project was largely successful from an industrial standpoint. Both countries had built functional, domestically produced ground attack aircraft. Components were shared between the production lines, and both air forces were operating essentially the same aircraft. But the similarities would end there. The IAR-93 and the J-22 Orao would have very different operational histories.

The Romanian IAR-93: Peacetime and a Brief Revolution

Romania’s IAR-93 spent most of its life in a peacetime role. They conducted training missions, participated in exercises, and maintained readiness, but Romania wasn’t involved in any major conflicts during the '80s. That changed in December 1989 when the Romanian Revolution erupted, overthrowing Nicolae Ceaușescu’s communist regime. The Romanian Air Force found itself in a confused and chaotic situation. Military units didn’t know whether to support Ceaușescu or join the revolution, and loyalties were unclear. Command and control broke down.

After the fall of communism, Romania’s military budget collapsed, and the country began shifting toward NATO standards and Western equipment. The IAR-93 fleet was maintained through the '90s but saw little use. Romania did develop an upgraded version called the IAR-99 Șoim, a jet trainer based on the IAR-93 technology but designed for a different role. By the 2000s, most Romanian IAR-93s were retired or placed in storage. A few remained operational into the 2010s for limited training and display purposes, but the type was effectively phased out as Romania’s focus shifted to Western aircraft and NATO integration. The IAR-93's operational life in Romania was relatively quiet: a few days of minor combat action at the end of 1989, followed by decades of peacetime training before retirement.

What is clear is that the IAR-93's combat debut was brief and occurred during a period of extreme confusion. The revolution lasted only about a week. However, on December 23 and 24, 1989, during the Romanian Revolution, they flew 17 combat missions to intercept unidentified aerial vehicles. Ceaușescu was executed on December 25th, 1989, and the fighting ended shortly after.

The Yugoslav J-22 Orao: The Trial of the Balkan Wars

The J-22 Orao in Yugoslavia would have a different story. When Yugoslavia began breaking apart in 1991, the J-22 Orao became one of the primary ground attack aircraft used by the Yugoslav People’s Army and later by Serbian and Montenegrin forces. The Yugoslav wars—the conflicts in Slovenia, Croatia, Bosnia, and later Kosovo—saw the J-22 Orao flying regular combat missions. These were the missions the aircraft had been designed for: close air support, ground attack against enemy positions, and strikes against infrastructure.

In 1991, the Yugoslavian J-22s conducted their first offensive action.The Yugoslav People’s Army used them to strike targets in Croatia. One aircraft was shot down by a Strela-2M MANPADS launched by the Croatian forces.The Bosnian Serbs inherited nine Oraos and used them in the Bosnian War. Four were lost, one of them with a friendly fire.The 105th Aviation Brigade of the Republic of Serbian Krajina also operated several ex-Yugoslav J-22s.

In the 1999 Kosovo Operation, the Oraos saw limited action due to NATO’s overwhelming air superiority. Still, they managed to perform some combat missions. One J-22 was lost on March 25, 1999, in unclear circumstances. Besides, eleven aircraft were destroyed on the ground. Some Serbian sources claim the Oraos shot down some Tomahawk cruise missiles during the war.

During the Croatian War of Independence and the Bosnian War, J-22 Oraos conducted bombing runs and rocket attacks. The aircraft operated in the low-intensity conflict environment they’d been designed for, attacking ground targets while facing limited air defense threats. However, the J-22 had significant limitations in this role. By the 1990s, it was becoming obsolete. It lacked modern avionics, precision-guided weapons, and advanced defensive systems, making it vulnerable to even relatively simple anti-aircraft weapons.

NATO Intervention and the End of the J-22 Era

During NATO’s Operation Deliberate Force in 1995, which targeted Bosnian Serb forces, J-22s were among the aircraft struck on the ground. NATO air superiority meant that Yugoslav aircraft were extremely vulnerable when airborne, so many stayed on the ground where they were destroyed by NATO airstrikes on air bases. The J-22's most significant combat use came during the Kosovo War in 1998 and 1999. Serbian and Yugoslav forces used the aircraft for strikes in Kosovo, but when NATO launched Operation Allied Force in March 1999, the J-22 fleet became a primary target. NATO aircraft systematically destroyed Yugoslav Air Force capabilities, and J-22 Oraos were hit in hardened shelters, on runways, and in revetments.

Below are some of NATO Operation Allied Force airstrikes that resulted in massive losses for Yugoslavia.

By the end of the Kosovo War in June 1999, much of Yugoslavia’s J-22 Orao fleet had been destroyed or damaged beyond repair. The aircraft that survived were those that had been hidden or were stationed at bases NATO didn’t strike. After the wars, the Federal Republic of Yugoslavia—later Serbia and Montenegro, and eventually just Serbia—maintained a reduced fleet of J-22s. Some were upgraded with improved avionics and systems, designated J-22 Orao 2, J-22M1A Orao (modernized with digital cockpit, sensors and external cameras) and continued flying into the 2000s and 2010s. Serbia officially retired the last of its J-22s around 2019, ending nearly 40 years of operational service. A few remain in museums or as monuments, including at the Mostar airfield where they were originally built.

J-22 Orao Variants:

• IJ-22 Eagle 1: 26 units dedicated reconnaissance aircraft, consisting of a single prototype, 10 pre-production aircraft, and 15 series production aircraft. The IJ-22 Orao 1 differs from the J-22B Orao 2 by having two Viper Mk 632-41R turbojet engines, each with a dry thrust of 17.79 kN and fueled by an internal weight of 2,360  kg, a length of 14.90 m including the probe for the single-seat model or 15.38 m including the probe for the two-seat model, a wheelbase of 5.40 m for the single-seat model or 5.88 m for the two-seat model, an empty equipped weight of 5,755  kg, a normal takeoff weight of 8,500  kg with reconnaissance pod, a maximum takeoff weight of 9,500 kg, a maximum speed in “clean” level flight of 1,033  km/h, a  maximum climb rate at sea level of 2,280 m per minute, and a climb time of up to 6,000 m in 3 minutes and 12 seconds and a service ceiling of 13,500 m.
•  INJ-22 Orao 1: Two-seat variant of the IJ-22 Orao 1, used for training reconnaissance pilots. Nine were built: the single prototype, five pre-production and three series production aircraft. 
• INJ-22M Orao 1:  A single series production unit of the INJ-22 (number 25606) was converted into a maritime surveillance variant at the Soko factory. All the equipment and controls in the rear cockpit were removed and replaced with a new panel, including a large CRT monitor. An Ericsson Doppler surveillance radar, housed in a pod, was installed under the fuselage
• J-22B Orao 2:  The Yugoslav equivalent of the IAR-93B with afterburner, integrated wing fuel tanks, greater armament capacity and diversity than the J-22A Orao 1, and Thomson-CSF HUD. Built only in a single-seat version. Production of the J-22A/B totaled 165 aircraft. Yugoslavia had planned a major modernization with radar and computerized navigation/attack system integrated via a MIL-STD-1553 digital data bus, but the dissolution of Yugoslavia interrupted the plans. Only 57 aircraft were delivered before production ceased; not all met the full J-22 Orao 2 standard. Another 42 aircraft were ordered but never delivered.
• NJ-22 Eagle:  A dedicated, two-seat training variant with afterburning engines, operated by the Yugoslav Air Force. It made its first flight in July 1986, with 21 units delivered and the construction of another 17 cancelled.
• J-22M1A Orao:  J-22 modernized with digital cockpit, sensors and external cameras and new weaponry capabilities.

IAR-93 Variants:

• IAR-93A: initial production version with non-afterburning Viper Mk 632-41 turbojets. The first production modification was the IAR-93A, which consisted of 15 pre-production and 18 production aircraft.
• IAR-93MB: MB = Motor de Baza (basic engine). This version had the fuselage of the IAR-93B but used the non-afterburning engine of the IAR-93A delivered starting in 1982 with 15 single-seaters built.
• IAR 93B:  refined version with afterburning Viper Mk 633-47 engines, increased internal fuel capacity, featured a new wing, additional attachment points, enlarged fuel tanks, and improved aerodynamics.  Also, the ventral fins, inboard wing fences and forward fuselage strakes were removed. First flew in 1985; entered service in 1987. A total of 27 single-seat and seven two-seat aircraft were built. The aircraft remained in service until 1998, when the conflict in Yugoslavia made maintenance impossible.

IAR-93 Operators:

Current

• Romanian Air Force — 116 in total, of which 87 were in service (including prototypes) and another 29 remained unfinished. A further 125 were ordered in 1989.

Proposal

• 48 aircraft planned.

• In 1988, Iran considered purchasing the IAR-93B Vultur during the final phase of the Iran-Iraq War, after facing aircraft losses and difficulties maintaining its US-supplied fleet—which included the Grumman F-14 Tomcat, McDonnell Douglas F-4 Phantom II, and Northrop F-5—due to Western arms embargoes. Negotiations were held for the potential acquisition of 48 IAR-93B aircraft, comprising 24 drawn from Romanian Air Force stocks and 24 newly manufactured units. Iranian pilots reportedly visited Romania to test the aircraft in Craiova, where they conducted evaluation flights and weapons tests using unguided bombs. Only minor modifications were planned for the export aircraft, primarily involving changes to radio equipment and Identification Friend or Foe (IFF) systems. The project did not progress to delivery following the August 1988 ceasefire that ended the Iran–Iraq War. Later discussions on broader economic cooperation between the two countries took place during the December 1989 visit of Romanian president Nicolae Ceaușescu to Tehran, but the aircraft acquisition was never implemented.

• 6 aircraft planned.

• A proposed export of the IAR-93 Vultur to Mauritania in the early 1990s. According to a few accounts, Romania explored a contract for six modified IAR-93 aircraft intended for maritime patrol and fisheries surveillance, along with two IAR-99 Șoim trainer aircraft and training for Mauritanian personnel. The aircraft were reportedly to be equipped with surveillance equipment for monitoring illegal fishing in Mauritanian territorial waters. The proposed agreement, valued at approximately US$40 million, allegedly involved a mixed payment structure combining cash with fishing rights granted to Romanian ocean-fishing companies operating off the Mauritanian coast. The deal, reportedly negotiated through the Romanian state arms export agency Romtehnica, was not concluded and the aircraft were never delivered.

J-22 Orao Operators:

Current

• Serbian Air Force and Air Defense — 17 in service, of which 4 are modernized (J-22 M1A version).

Previously

• Air Force and Air Defense of Bosnia and Herzegovina — inherited 7 aircraft from the Air Force of Republika Srpska. None are in service.

• Yugoslav Air Force — aircraft transferred to successor states after the dissolution of Yugoslavia.

Specifications

Conclusion: A Monument to Independent Cooperation

The IAR-93 and J-22 Orao represent one of the more successful examples of military cooperation between communist countries outside direct Soviet control. Romania and Yugoslavia jointly developed, produced, and operated the same aircraft for decades, with over 350 aircraft built between both countries.

The aircraft itself was never cutting-edge, and it wasn’t trying to be. It was a practical, affordable ground attack jet designed to be built with the industrial capabilities Romania and Yugoslavia had in the '70s. And for that purpose, it succeeded. Today, a few remain in museums or displayed as monuments, reminders of when two countries decided they could build their own jet and actually pulled it off.

IAR-93 in museums