From Our Special Correspondent

Daijiworld Media Network - Bengaluru

Bengaluru, Nov 23: The indigenous Intermediate Jet Trainer (IJT) designed and developed by HAL to replace the ageing Kiran aircraft fleet of the IAF commenced spin flight testing in Bengaluru.

The flight was piloted by HAL’s test pilots Group Capt H V Thakur (Retd) and Wing Commander P Avasti (Retd).

The spin testing of an aircraft is the most crucial phase of its flight testing. The testing will be gradually progressed to assess the behaviour of the aircraft till six turn spins to either side to meet the targeted requirement, says a press release from HAL.

The IJT has already been tested to its full envelope in terms of speed, altitude and load factor (‘g’ envelope) and has also been integrated with drop tanks as well as bombs.

HAL redesigned the aircraft for the spin test by moving the vertical tail aft and extending the rudder surface. These changes for ensuring a satisfactory spin behaviour required an extensive redesign of the rear fuselage and the rudder.

The changes have been incorporated into two aircraft with the involvement and clearance from certification agencies at every stage. Postmodification, the two aircraft underwent significant flight tests to assess the general handling with the new configuration of fin and rudder.

These aircraft have now been incorporated with the necessary safety devices (Anti-Spin Parachute Systems), according to HAL.

Initially, the aircraft was taken through one turn spin to the left and right-hand sides to test the spin characteristics during the first flight.