Sukhoi Su-15
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| Sukhoi Su-15 | |
|---|---|
| Name | Sukhoi Su-15 |
| Caption | Su-15 interceptor in flight |
| Type | Twinjet all-weather interceptor |
| Manufacturer | Sukhoi Design Bureau |
| First flight | 1962 |
| Introduced | 1965 |
| Retired | 1990s |
| Primary user | Soviet Air Defence Forces |
| Produced | 1960s–1970s |
| Number built | ~1,290 |
Sukhoi Su-15 is a twin-engined, all-weather interceptor developed by the Sukhoi Design Bureau for the Soviet Air Defence Forces during the Cold War. Designed to counter high-speed, high-altitude threats such as strategic Boeing B-52 Stratofortress and reconnaissance aircraft like the Lockheed U-2, the Su-15 entered service in the mid-1960s and became a mainstay of Soviet air defence alongside types like the MiG-21 and MiG-23. It served with multiple air arms including the Soviet Air Force and allied operators before gradual withdrawal in the 1980s–1990s.
Development
Development traces to a Soviet requirement issued after the 1960 U-2 incident and the need to replace earlier interceptors such as the Sukhoi Su-9 and Sukhoi Su-11. The Su-15 program at Sukhoi Design Bureau built on experience from prototypes like the T-58 and lessons from the MiG-25 project, with design reviews involving the Moscow Aviation Institute and testing at the Gromov Flight Research Institute. Political direction came from ministries including the Ministry of Aviation Industry and strategic planners at the General Staff of the Armed Forces of the USSR, while production was assigned to factories in Irkutsk and Novosibirsk. Initial flight trials in the early 1960s evaluated propulsion sourced from the Tumansky R-11 lineage and radar systems developed by the Izumrud and Sapfir bureaus.
Design
The Su-15 featured a mid-mounted swept wing and twin under-fuselage lateral air intakes feeding twin turbojet engines derived from Tumansky designs. Avionics included pulse-Doppler and interception radars from the Tikhomirov Scientific Research Institute of Instrument Design and fire-control integration with onboard K-8 and later R-98 air-to-air missiles produced by the Molniya design teams. The airframe emphasized speed and climb performance for quick reaction intercepts against targets such as Convair B-58 Hustler and Northrop Grumman B-2 Spirit planners (conceptually), and incorporated ejection seats licensed from Zvezda. Defensive and operational fittings included IFF transponders compatible with Soviet Integrated Air Defense System nodes and datalink adaptations linked to Soviet early warning radar networks like Daryal and Voronezh.
Operational history
Deployed with the Soviet Air Defence Forces from the mid-1960s, the Su-15 conducted scrambles to intercept intruders over the Arctic, Baltic, and far eastern Soviet sectors, frequently interacting with NATO assets such as Royal Air Force and United States Air Force reconnaissance sorties. Units equipped with Su-15s operated from bases including Khotilovo, Kvashino and Monchegorsk under command structures tied to the PVO Strany. The type saw notable deployments during crises like the Prague Spring airspace alerts and tense incidents during the Cold War. Export and allied operation included limited service with the Czechoslovak Air Force and air defense elements of other Warsaw Pact members under coordination via the Warsaw Pact military framework.
Variants
Variants evolved to meet radar, engine and weapons upgrades: early interception models optimized for speed and climb were followed by improved avionics and missile suites in later production blocks. Specialized prototypes explored reconnaissance and high-altitude interception roles, drawing on developments from the Sukhoi Su-17 and research at the Central Aerohydrodynamic Institute (TsAGI). Some upgrade paths paralleled modernization efforts used on contemporaries such as the MiG-23 and Su-27 programs, though export variants had downgraded electronics for use by Warsaw Pact air arms.
Operators
Primary operator was the Soviet Air Defence Forces, with operational units across regions administered by military districts including the Leningrad Military District and Far Eastern Military District. Allied operators included the Czechoslovak Air Force and limited transfers within the Warsaw Pact framework; post-Soviet successor states inherited examples in inventories of the Russian Air Force and other former Soviet republics before phased retirement.
Accidents and incidents
Notable incidents involved interceptions that resulted in shootdowns and diplomatic crises, including engagements with civilian aircraft that provoked international attention and investigations by organizations such as International Civil Aviation Organization. Operational losses occurred due to accidents during high-speed interceptions, mechanical failures traced to Tumansky engines, and runway or approach mishaps at bases like Koltsovo and Saki Air Base. Investigations were conducted by Soviet military boards and research entities including the GosNIIAS and often led to procedural or technical mitigations across interceptor fleets.