Working on 10 to 12 tonne category of helicopters which could potentially replace the MIG-17s post their retirement, that's the word coming in from R Madhavan, chairman and md of Hindustan Aeronautics Limited. Speaking to Anu Sharma on the second day of the Defence Expo in Lucknow, the HAL CMD also added that the company has identified several countries for exports in parts of Asia, Africa and also the United States of America.