The induction of a new aircraft is always an interesting phase in military aviation. In this episode we speak to Air Cmde Harish Nayani, a test pilot who participated in the significant upgrade to the MiG-21 BIS that resulted in the MiG-21 Bison and was one of the first officers to command a Bison squadron. Through this interview, we will learn about how such upgrades are planned and executed.  Air Cmde Nayani's bio can be seen at this link: http://www.bharat-rakshak.com/IAF/Database/17135 More about the MiG-21 Bison upgrade program is available at this link: https://www.bharat-rakshak.com/IAF/aircraft/current/605-bison.html