Tyagi was grilled yesterday based on the allegation against him by the CBI that he had reduced flying ceiling of the helicopter from 6,000 to 4,500 metres to include AgustaWestland in the bid.
The CBI has alleged that the reduction of the service ceiling, maximum height at which a helicopter can perform normally, allowed the UK-based firm to get into the fray as otherwise its helicopters were not even qualified for submission of bids.
Tyagi has denied the allegations levelled against him and claimed that the decision to reduce the ceiling was taken by a group of senior officials.
The agency had quizzed former IAF deputy chief J.S. Gujral earlier on Saturday in connection with this case.
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