In doing so, the HTT-40 approved the so-called “six-turn spin test”, which is considered the final and most difficult test for a trainer aircraft.
From 2012, the IAF has constantly opposed the HTT-40, first insist the Ministry of Defense (MoD) to import 75 Pilatus PC-7 Mark II basic trainers jets from Switzerland, and then HAL repeatedly appeals more imports. HTT-40 should never be able to run through all its tests.
“There is no need for [HTT-40 trainer]”, the then IAF boss, Air Chief Marshal NAK Brown, said at the 2013 Aero India show dismissal. “We have the Pilatus PC-7. It is a proven aircraft. The project HAL plan is from scratch. We indicate that the cost will be very high. Complied, and criticized the HTT-40, demanding more Pilate imports.
As Business Standard report (10th June 2019, “The IAF block on homegrown HTT-40 trainer jet and keeps the door open for Swiss trainers”). The current IAF chief refused to issue a tender for HTT-40, Which was required to purchase engines for production aircraft. The Indian Air Force stated that it would do this only after approving the HTT-40’s six-spin spin tests. HAL has opposed the IAF’s counterclaim. Successive HAL chiefs supported HTT-40, receiving an internal HAL fund of Rs 350 crore for the project. A team of young, talented HAL designers has worked without IAF assistance or funding as outlined by former defense ministers, AK Antony and Manohar Parrikar.
For the Pilatus PC-7 Mark II trainer, whose purchase is already under scrutiny by the Central Bureau of Investigation, it is most likely the termination of further imports.
HAL has built the Air Force’s Hawk Advanced Jet Trainers (AJT) fleet with technology from BAE Systems. With the HTT-40 ready for final approval, a breakthrough on the IJT could mean that the entire training aircraft fleet of the IAF includes HAL-built aircraft.
Source: Business Standard