The allegations surfaced in the form of a letter received by HAL recently claiming that bribes were paid to officials in HAL and other departments concerned to bag contracts.
HAL immediately initiated an inquiry into the charges through its Chief Vigilance Officer (CVO).
The investigations by CVO have prima facie found that the company allegedly violated several of the contractual obligations with HAL between the period of 2007-11, when these bribes were allegedly paid, they said.
Defence Minister A K Antony ordered the CBI probe after the case along with the findings and recommendations of the CVO of HAL was brought to his notice.