The AL-31F is a
high-temperature fully-ducted turbofan of modular design
with mixed afterburner. It features high reliability,
including engine operation under extreme conditions of
air inlet distortion and fluctuation. The AL-31F powers
the Su-27 fighter and its modifications, the Su-33
carrier-borne fighters, the Su-30МK multi-purpose
fighters and Su-34 bombers.
operation, the AL-31F modular design enables replacement
of the nozzle, afterburner, mixer, reduction gear and
other components, repair and replacement of LPC stage 1
blades and HPC blades of all stages.
AL-31FN is the AL-31F derivative with the aircraft
accessory gearbox mounted underneath the engine.
AL-31FP is a high-temperature fully-ducted turbofan of
modular design. It is the AL-31F derivative with all
advantages of the predecessor retained.
engines power the advanced multi-purpose 4+ generation
design feature is a variable asymmetric vectoring nozzle
with a thrust vector angle of ±15° ensuring aircraft
nozzle control is integrated with the aircraft control
manifests stable operation under all possible changes of
aircraft attitude under super-maneuvering conditions,
including zero and negative airspeed. The variable
thrust vector is of a great efficiency, which
considerably surpasses efficiency of the aircraft
aerodynamic rudders. The systems of surge destruction,
in-flight automatic start, combustor and afterburner
relightprovide the powerplant stable operation, with
airborne weapon application.
The seal at the
thrust vectoring nozzle-to-afterburner end part
transition area is one of the AL-31FP most complex
assemblies, where the temperature attains 2000°С, and
pressure is 5 to 7 atmospheres.
4th GENERATION ++
The 117С engine
is a deep modernization of the AL-31F engine (generation
The 117С is an
aircraft turbofan engine with a variable thrust nozzle
of generation 4++ developed by NPO Saturn to the Sukhoi
Design Bureau order for the export Su-35 fighter.
The 117С engine
is a deep thrust-life modernization of the AL-31FP,
which will be installed on the latest Sukhoi
engine thrust has been increased by 16% compared to the
base AL-31FP engine, and has reached 14500 kgf, the
lifetime has been doubled, up to 4000 hours.
parameters, on retention of the overall dimensions and
weight, are attained due to application of an absolutely
new high-tech low pressure compressor with increased air
flow and efficiency, a new high-performance turbine of
increased reliability with an improved blade cooling
system and digital engine control system integrated with
the aircraft control system.
parameters have been confirmed in the course of the
demonstrator engine bench and flight tests. A special
NPO Saturn achievement is a stable and reliable
operation of the engine at Mach number exceeding 2,
which was obtained in the course of the demonstrator
As for geometry
and attachment points on the aircraft, the 117С engine
conforms to its predecessors, generation 4 AL-31F and
AL-31FP engines. This makes it possible, with slightly
developed engine nacelles and equipment, to use the 117С
engine for modernization of the entire aircraft fleet of
previously manufactured Su-27/Su-30, operational both by
the Russian and foreign Air Force.
On 19 February
2008, a new 117С-powered Su-35 aircraft successfully
performed its first test flight.