August 1999 - The Indian Air Force (IAF), which is responsible for carrying out VVIP communication duties, proposes replacement of Mi-8 helicopters due to operational constraints.
March 2002 - A global request for proposals issued.
January 2010 - The Cabinet Committee on Security clears proposal to acquire 12 helicopters for use of VVIPs after a long process that involved change in some parameters, evaluations and and negotiations.
Feb 8, 2010 - Ministry of defence (MoD) concludes contract for supply of 12 AW-101 VVIP helicopters with Britain's AgustaWestland.
February 2012 - Media reports about allegations of unethical dealings in helicopter procurement appear. MOD seeks factual report from Indian embassy in Rome.
Feb 12, 2013 - Italian Police arrest Giuseppe Orsi, CEO of Finmeccanica, parent company of AgustaWestland, as part of bribery investigations into the chopper deal.
Feb 15, 2013 - MOD initiates action for cancellation of contract and puts on hold payments to company. Issues a formal show cause notice to AgustaWestland seeking cancellation of contract and taking other actions as per the terms of the contract and the integrity pact. Investigation handed over to Central Bureau of Investigation (CBI).
Feb 25, 2013 - CBI registers a preliminary enquiry (PE) against 11 people, including former IAF chief S.P. Tyagi, and four companies.
March 13, 2013 - CBI registers a first information report (FIR) against Tyagi and 12 others for alleged criminal conspiracy and cheating in the chopper deal.
November 2013 - AgustaWestland officials meet MoD officials to present their case. The company nominates Justice B.N. Srikrishna for arbitration. It submits its reply to the final show cause notice before Nov 26 deadline.
Jan 1, 2014 - The Indian government terminates the agreement on grounds of breach of the Pre-contract Integrity Pact (PCIP) and agreement by AgustaWestland.