aircraft lift ability and deflects automatically to allow high angle of attack (AoA) flights allowing it to perform Pugachev's Cobra. The integral aerodynamic configuration combined with thrust vectoring results in extremely capable manoeuvrability, taking off and landing characteristics. This high agility allows rapid deployment of weapons in any direction as desired by the crew. The canard notably assists in controlling the aircraft at large angles-of-attack and bringing it to a level flight condition. The aircraft has a fly-by-wire (FBW) with quadruple redundancy. Dependent on flight conditions, signals from the control stick position transmitter or the FCS may be coupled to remote control amplifiers and combined with feedback signals from 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 stalls through dramatic increases of control stick pressure, allowing a pilot to effectively control the aircraft without exceeding the angle of attack and acceleration limitations. Although the maximum angle of attack is limited by the canards, the FBW acts as an additional safety mechanism. The Su-30MKI has a range of 3,000 km with internal fuel which ensures a 3.75 hour combat mission. Also, it has an in-flight refueling (IFR) probe that retracts beside the cockpit during normal operation. The air refueling system increases the flight duration up to 10 hours with a range of 3,000 km combat radius. Su-30MKIs can also use the Cobham 754 buddy refueling pods. The Su-30MKI's radar cross-section (RCS) is reportedly from 4 to 20 square metres. Cockpit The displays include a customised version of the Israeli Elbit Su 967 head-up display (HUD) consisting of bi-cubic phase conjugated holographic displays and seven multifunction liquid-crystal displays, six 127 mm × 127 mm and one 152 mm × 152 mm. 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 status. Variants of this HUD have also been chosen for the IAF's Mikoyan MiG-27 and SEPECAT Jaguar upgrades for standardisation. The rear cockpit has a larger monochrome display for air-to-surface missile guidance. The Su-30MKI on-board health and usage monitoring system (HUMS) monitors almost every aircraft system and sub-system,