Answer: Hindustan Aeronautics Limited (HAL)
Notes: The Hindustan Turbo Trainer Aircraft-40 (HTT-40) is an indigenously developed basic trainer aircraft by the Aircraft Research and Design Centre (ARDC) of Hindustan Aeronautics Limited (HAL). It is designed to meet the training requirements of the Indian Armed Forces and is equipped with modern avionics and safety features, enhancing the training quality for ab-initio pilots of the Indian Air Force.
