The Intermediate Jet Trainer (IJT), which is being developed as the second rung of the Indian Air Force’s three-level training programme for rookie pilots, is set to undergo its most critical ‘spin' test this month, according to a top executive of Hindustan Aeronautics Ltd. (HAL).
The spin test, which is at least eight months behind schedule, is seen as an ‘agnipariksha’ when it comes to safety of the pilot and the aircraft during combat.
Success will mean HAL can start planning series production “and we are confident of it (success),” HAL Chairman & Managing Director T. Suvarna Raju told
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Work on the twin-seat IJT (or HJT-36) started in 1999. Admitting that the spin test had been an issue, Mr. Raju said, “We expected to spin the aircraft about eight months ago and clear it for series production. We could not spin or stall the aircraft. It is a very crucial job that should be done very carefully, as there is a lot of risk for men and material.”
In the last few months, HAL consulted UK aerospace major BAE Systems on certain design changes. The aircraft was modified and assessed many times over by mathematical modelling and wind tunnel tests.
After the engine stall test, “we are re-assessing the spin characteristics. We are close… after carrying out modifications. I am waiting for the happy news [in the next 20-30 days],” Mr. Raju said.
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The IAF requires 85 IJTs. Currently into limited series production, the two prototypes have flown around 1,000 hours since the first flight in March 2003.
DelayedThe spin test was planned for 2013, but was delayed over deciding the engine, delivery from Russia and accidents in 2007, 2009 and 2011. “Today, we are confident that that every problem has found a solution. The aircraft that is going to come out of all this is going to be really worth flying,” Mr. Raju said.