Ilyushin Il-78

Ilyushin Il-78. The Ilyushin Il-78 is a four-engined aerial refueling tanker based on the Ilyushin Il-76 strategic airlifter. Developed in the Soviet Union by the Ilyushin design bureau to extend the operational range of its tactical and strategic aviation, it entered service with the Soviet Air Forces in the mid-1980s. The aircraft employs a probe-and-drogue refueling system and can also function as a transport, carrying fuel in internal tanks that can be removed for cargo duties.

Design and development

The development of the Il-78 was initiated to address the Soviet Air Forces' requirement for a dedicated tanker capable of supporting long-range operations of aircraft like the Tupolev Tu-95, Tupolev Tu-160, and Mikoyan MiG-31. The program was led by Ilyushin chief designer Genrikh Novozhilov, utilizing the proven airframe of the Ilyushin Il-76MD. The core modification involved installing three UPAZ-1A "Sakhalin" refueling pods, two under the wings and one at the rear of the cargo floor, with fuel carried in two large tanks installed in the cargo hold. The aircraft retained its full cargo handling capability, allowing for rapid conversion between tanker and transport roles, a design philosophy reflecting the Soviet Air Forces' operational doctrines. The prototype, converted from an Ilyushin Il-76MD, first flew on 26 June 1983, with state acceptance trials conducted at the Chkalov State Flight Test Center.

Operational history

Entering operational service in 1984, the Il-78 initially equipped regiments within the Soviet Air Forces, providing critical support for Long Range Aviation and Air Defence Forces aircraft during patrols and exercises. Following the dissolution of the Soviet Union, many aircraft were inherited by successor states, including the Russian Air Force, Ukrainian Air Force, and the air forces of Uzbekistan and Belarus. The Russian Aerospace Forces have employed Il-78s extensively in operations such as the Russian military intervention in the Syrian Civil War, refueling bombers like the Tupolev Tu-160 during long-range missile strikes. The type has also seen export success and combat use with other operators, including the Indian Air Force, which used its Il-78MKIs to support Dassault Mirage 2000 and Sukhoi Su-30MKI aircraft.

Variants

* Il-78: Initial production variant based on the Ilyushin Il-76MD, featuring three UPAZ-1A pods and removable cargo hold fuel tanks. * Il-78M: Enhanced "M" (*Modifitsirovannyy*) variant developed for the Russian Air Force with a permanent fuel tank system in the cargo hold, increasing fuel offload capacity. It is equipped with improved UPAZ-1M refueling pods. * Il-78MKI: Custom export variant for the Indian Air Force, incorporating an Israeli Aerospace Industries refueling system with a centerline hose drum unit and underwing pods compatible with probe-equipped aircraft like the Sukhoi Su-30MKI. * Il-78MP: A proposed variant for the Polish Air Force that was not procured. * Il-78M-90A: A modernized version based on the new Ilyushin Il-76MD-90A airframe with Aviadvigatel PS-90 engines, enhanced avionics, and greater fuel capacity. It conducted its maiden flight in 2018.

Operators

* Current Military Operators: ** Algeria – Algerian Air Force ** China – People's Liberation Army Air Force (designated HY-78) ** India – Indian Air Force ** Pakistan – Pakistan Air Force ** Russia – Russian Aerospace Forces ** Ukraine – Ukrainian Air Force * Former Military Operators: ** Soviet Union – Soviet Air Forces (passed to successor states) ** Uzbekistan – Uzbekistan Air and Air Defence Forces

Specifications (Il-78M)

* Crew: 6 (2 pilots, flight engineer, navigator, 2 refueling operators) * Length: 46.59 m (152 ft 10 in) * Wingspan: 50.5 m (165 ft 8 in) * Height: 14.76 m (48 ft 5 in) * Empty weight: 72,000 kg (158,733 lb) * Max takeoff weight: 210,000 kg (462,971 lb) * Powerplant: 4 × Soloviev D-30KP turbofan engines, 117.7 kN (26,500 lbf) thrust each * Maximum speed: 850 km/h (530 mph, 460 kn) * Range: 7,300 km (4,500 mi, 3,900 nmi) as tanker with 65-tonne fuel load * Ferry range: 9,500 km (5,900 mi, 5,100 nmi) * Service ceiling: 12,000 m (39,000 ft) * Fuel offload capacity: Up to 65,000 kg (143,000 lb) at 2,000 km range * Refueling systems: 3 × UPAZ-1M hose-drogue units (2 underwing, 1 aft fuselage)

Category:Aerial refueling tankers Category:Soviet military transport aircraft Category:Ilyushin aircraft