Kuznetsov NK-8-2U turbofan engine © Konstantinos Panitsidis

Photo from the personal collection of Konstantinos Panitsidis

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The NK-8-2U turbofan engine is designed for installation on Tu-154A, Tu-154B and Tu-154S mainline jet aircraft. The NK-8-2U turbofan engine is basically a modified engine with increased thrust up to 10,500 kgf, based on the NK-8-2. Engine production has been imposed since 1972. In total, more than 2500 units were produced.

The NK-8-2U power plant is a turbofan, two-rotor, gas turbine engine with a mixture of air and gas flows, a thrust reverser cascade vanes and a common jet nozzle.

Turbofan engine NK-8-2U, Left side view (aircraft Tu-154B)

Turbofan engine NK-8-2U, Left side view (aircraft Tu-154B) 


The NK-8-2U turbofan engine consists of:

- inlet guide vanes (IGV)
- two rotor, nine-stage axial compressor
- middle bearing
- annular combustion chamber
- two rotor three-stage axial turbine
- shells and mating ring
- reversing device
- exhaust nozzle (jet nozzle)
- units that provide and maintain the operation of aircraft engine systems.

Turbofan engine NK-8-2U, Right side view (aircraft Tu-154B).

Turbofan engine NK-8-2U, Right side view (aircraft Tu-154B).



DESIGNER OKB-276 N.D. Kuznetsov
TYPE OF ENGINE Turbofan engine
Aircraft powered by the engine Tu-154A (B and S)
Fuel T-1, TS-1, T-7
Oil MK-8, MK-8P and synthetic oil VNII-IP-50-1-4F
Max thrust take-off power rating (H=0, V=0, ISA) 10.500 kgf
Negative thrust in the mode not higher than the nominal (H=0, V=0, ISA) 3600+150 kgf
Acceleration capability time 8-10 s
Specific fuel consumption, take-off power rating 0,580 kg/kgf.*h
Max thrust, cruise power (H=11.000 m, M=0,8) 2.200 kgf 
Specific fuel consumption, cruise power 0,766 kg/kgf.*h
- the number of stage of  
a) low pressure compressor 4
b) high pressure compressor  
Pressure ratio, take-off power rating 10,8
Bypass ratio, take-off power rating 1,05
Combustion chamber Annular type
Temperature of the gas at the turbine intake, take-off power rating 1.156 K
Air flow rate, take-off power rating 228 kg/sec
Compressor rotation frequency low-pressure, take-off power rating -
Compressor rotation frequency high-pressure, take-off power rating
- the number of stages of 1
b) low pressure turbine 2
Jet nozzle Constant-geometry type with mixing chamber.
Thrust reverser With rotating cascade
Mass of engine 2350+2% kg (including thrust reverser)
-length with reverser and nozzle 5288 mm
-length with jet nozzle 4762 mm
Maximum engine diameter 1442 mm
Dry weight of the engine 2100 kg ±2%
Dry weight of engine with reverser and nozzle 2350 kg ±2%
Engine overhaul life Set by bulletins
Specified service life 19.000 h
Shelf life of preserved engine 5 years


PHOTOS NK-82U turbofan engine




NK-8-2U turbofan engine © Redstar.gr