India’s state owned airframer, Hindustan Aeronautics Limited (HAL) has announced the completion of a six turn spin on the indigenously developed HJT-36 Intermediate Jet Trainer (IJT).
The capability to enter and recover from spin is a necessity for a trainer aircraft in order to familiarise the trainee pilot to recognise departure from controlled flight and the actions required to recover from such situations. Achieving satisfactory characteristics during spin and an assured recovery from spin form a part of very crucial flight tests due to its unpredictability.
According to a HAL release, the prototype aircraft successfully demonstrated the capability to carry out six turn spins to the LH and RH sides. The aircraft was piloted by HAL test pilots Gp. Capt HV Thakur (Retd) and Gp. Capt A Menon (Retd).
Demonstrating the HJT-36’s capability to have six turn spins on both sides was a major milestone said Arup Chatterjee, Director (Engineering and R&D) at HAL,
The IJT was conceived by HAL as a replacement to the ageing Kiran trainer fleet and had already completed demonstration of its capabilities in terms of altitude and speed envelope, load factor, satisfactory stall characteristics and limited armament capability as required by IAF, much earlier.
The HJT-36 is being designed and developed by HAL for Stage –II training of Indian Air Force (IAF) pilots and has had a troubled and prolonged development. During the course of spin testing, in 2016, the aircraft departed from controlled flight which brought the programme to a temporary halt. However, HAL decided to proceed further using its internal resources to complete the critical Spin testing.
Subsequent to the temporary halting of flight tests in 2016, HAL undertook major modifications like shifting the vertical tail aft on the airframe and increasing the rudder area and flight testing resumed in April 2019. These modifications entailed the use of a new Anti-Spin Parachute system (ASPS) which is mandated for the safety of the aircraft and test crew during spin flight testing. The new ASPS was integrated into the aircraft in July 2020 and the successful streaming of the parachutes were demonstrated in September 2020. Despite the delays due to COVID-19 pandemic, HAL could commence the stall and spin testing of the IJT in its new modified configuration in November 2020.
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