* Mar 13, 2013: CBI files FIR against Tyagi, 12 others for alleged cheating and criminal conspiracy in Rs 3,600 crore VVIP helicopter deal.
* Dec 9, 2016: CBI arrests Tyagi, his cousin Sanjeev Tyagi and lawyer Gautam Khaitan in the case.
* Dec 10: A Delhi court sends Tyagi, others sent to CBI custody.
* Dec 17: Court sends Tyagi, others to judicial custody.
* Jan 4, 2017: Delhi court grants bail to Sanjeev Tyagi and lawyer Khaitan.
* May 30: HC stops ex-IAF chief S P Tyagi from travelling to Indonesia.
* Sep 1: Tyagi chargesheeted by the CBI in a Delhi Court along with nine others in the Rs 3,500 crore AgustaWestland VVIP chopper deal.
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