The Yakovlev Yak-42 (NATO reporting name: “Clobber”) is a 100/120-seat three-engined mid-range passenger jet developed in the mid 1970s to replace the technically obsolete Tupolev Tu-134. It was the first airliner produced in the Soviet Union to be powered by modern high-bypass turbofan engines.
The Yak-42 is a low-winged monoplane of all-metal construction, with a design lifespan of 30,000 one-hour flights. It has a pressurised fuselage of circular section, with the cabin designed to carry 120 passengers in six-abreast layout (or 100 passengers for local services with greater space allocated to carry-on luggage and coat stowage). The aircraft is flown by a flight crew of two pilots sitting side by side in a flight deck forward of the cabin. Access is via two airstairs, one in the underside of the rear fuselage, like that of the Yak-40, and one forward of the cabin on the port side. Two holds are located under the cabin, carrying baggage, cargo and mail.
All of the prototypes had main landing gear with two wheels each, with the first serial production aircraft, four main wheels were introduced. The wing layout underwent considerable revision during the design process, with the first prototype being built with a wing sweep of 11 degrees and the second prototype with a sweep of 23 degrees. After evaluation, the greater sweep of the second prototype was chosen for production. Early aircraft had a clean wing leading edge with no control surfaces, and plain trailing edge flaps. This changed in later aircraft, which were fitted with leading edge slats, with the trailing edge flaps slotted.
General characteristics
Crew: 2 pilots plus optional flight engineer
Capacity: up to 120 passengers (normally eight first class and 96 economy class)
Length: 36.38 m (119 ft 4 in)
Wingspan: 34.88 m (114 ft 5 in)
Height: 9.83 m (32 ft 3 in)
Wing area: 150 m2 (1,600 sq ft)
Airfoil: root: TsAGI SR-9 (8.5%); tip: TsAGI SR-9 (6.5%)
Empty weight: 33,000 kg (72,753 lb)
Max takeoff weight: 57,500 kg (126,766 lb)
Powerplant: 3 × Lotarev D-36 turbofan engines, 63.75 kN (14,330 lbf) thrust each
Performance
Maximum speed: 810 km/h (500 mph, 440 kn)
Cruise speed: 740 km/h (460 mph, 400 kn)
Range: 4,000 km (2,500 mi, 2,200 nmi)
Service ceiling: 9,600 m (31,500 ft)
Located in VDNKh park, Moscow.
