The Su-30MKI is a highly integrated twin-finned aircraft.
The airframe is constructed of titanium and
high-strength aluminium alloys.
The engine nacelles are
fitted with trouser fairings to
provide a continuous streamlined profile between the nacelles and the
tail beams. The fins and
horizontal tail consoles are
attached to tail beams. The central beam section between the engine
nacelles consists of the equipment compartment, fuel tank and the brake
parachute container. The fuselage
head is of semi-monocoque construction
and includes the cockpit, radar compartments
and the avionics bay.
The displays include a highly customised version of the Elbit Su 967
head-up display consisting of bicubic phase conjugated holographic
displays and seven liquid crystal multifunction displays, six 127 mm x
127 mm and one 152 mm x 152 mm. Variants of the same HUD have also been
chosen for the IAF's MiG-27 and SEPECAT Jaguar upgrades, on grounds of
standardisation. Flight information is displayed on four LCD displays
which include one for piloting and navigation, a tactical situation
indicator, and two for display systems information including operating
modes and overall operation status. The aircraft has a fly
by wire (FBW) with quadruple
redundancy. Depending on the flight conditions, signals from the control
stick position transmitter or
the FCS will be coupled to the remote control amplifiers. These signals
are combined with feedback signals fed by acceleration sensors and rate gyros.
The resultant control signals are coupled to the high-speed
electro-hydraulic actuators of the elevators, rudders and
the canard. The output signals are compared and, if the difference is
significant, the faulty channel is disconnected. FBW is based on a stall warning
and barrier mechanism which prevents development of aircraft stalls
through a dramatic increase in the control stick pressure. This allows a pilot to
effectively control the aircraft without running the risk of reaching
the limit values of angle of
attack and acceleration.
Although the maximum angle of attack is limited by the canards the FBW
acts as an additional safety mechanism.