Hindustan Aeronautics Limited (HAL) is ready to begin a new series of spin testing for its HJT-36 subsonic intermediate jet trainer to validate its redesigned vertical tail.
By Sergey Krivchikov [GFDL 1.2 or GFDL 1.2], via Wikimedia Commons
The original design had fared poorly during trials and BAE Systems was roped in to improve its spin characteristics in 2014.