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Yakovlev Yak-42

Yakovlev Yak-42 Rusjet

A Yakovlav Yak-42 of Rusjet taxies at Amsterdam Schiphol Airport.

Yakovlev Yak-42

The Yakovlev Yak-42 is a three-engined jet airliner seating 100-120 passengers, designed for short to medium-range flights. It was the first Russian airliner powered by high-bypass turbofan engines.

The Yakovlev Design Bureau started working on the Yak-42 as a replacement for the Tupolev Tu-134 jet and the Ilyushin Il-18 turboprop. The first design proposals showed a twin-engined jet airliner fitted with Soloviev D-30 turbofans, the same as used for the Tupolev Tu-134. Later the Yakovlev engineers chose a three-engined configuration with a swept wing and high-bypass Lotarev D-36 turbofans.

The Yak-42 made its maiden flight on 7 March 1975. The first prototype had an 11 degrees swept wing, but the second prototype had a wing with a sweep of 23 degrees. The latter was chosen for the production version. Later Yak-42s were fitted with leading edge slats and slotted trailing edge flaps to improve runway performance.

Aeroflot started operating the the Yak-42 on 22 December 1980 on a flight from Moscow to Krasnodar. NATO assigned the name 'Clobber' to the aircraft. After an accident in June 1982, when the tailplane detached during flight, the Yak-42 was grounded. It resumed airline service more than two years later, in October 1984.

Yak-42 Air Bosna Two engines are mounted in pods on either side of the rear fuselage. The middle engine is at the end of an S-duct, embedded inside the rear fuselage, under the T-tail. An auxiliary power unit (APU) is also fitted in the rear fuselage. The aircraft lacks thrust reversers.

The cabin seats up to 120 passengers in a six-abreast layout, like in the Boeing 737 and Airbus A320. The aircraft has two airstairs, including one in the rear fuselage under the T-tail.

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The original production version was designated 'Yak-42'. The Yak-42ML has modified avionics for use on international flights and the Yak-42D is a long-range variant with increased fuel capacity, which became the later standard production version. The Yak-142 is a derivative with western AlliedSignal avionics, spoilers to allow faster descent and an enlarged cabin door to accommodate jet bridges.

The Yak-42M was a proposed but never built stretched version with a new wing and to be powered by three Progress D-436 turbofans. This version was further developed into the Yak-242 with two Aviadvigatel PS-90 turbofans in underwing pods. This design evolved into the Irkut MS-21, a 150-seater which is now under full-scale development.

More than 180 Yak-42s have been built. In 2018 around 20 aircraft were still in airline service.


Yakovlev Yak-42 Specifications

Yakovlev Yak-42 Karat Wingspan: 34.88 m (114 ft 5 in). Length: 36.38 m (119 ft 4 in). Height: 9.83 m (32 ft 3 in).
Empty weight: 33,000 kg (72,752 lb). Max. take-off weight: 57,500 kg (126,765 lb).

Accommodation: up to 120 passengers. Range: 4,000 km (2,158 nm). Cruise speed: 740 km/h (399 kts).
Engines: three Lotarev D-36 turbofans (63.75 kN - 14,330 lb).


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Yakovlev Yak-42

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