Former IAF Chief SP Tyagi will be questioned by the Central Bureau of Investigation (CBI) for the third day on Wednesday, in connection with the controversial Rs 3,600 crore . AgustaWestland chopper deal. The CBI had earlier said that the former IAF chief has admitted to have financial interest in three companies-Banshi, Anuras and Shavan - involved in the controversial Rs. 3,600 crore chopper deal.