The ruling BJP, however, rejected the main Opposition party's charge as "politically motivated and baseless".
Citing a report of Comptroller and Auditor General (CAG) presented in 2011, Chhattisgarh Congress President Bhupesh Baghel alleged the government led by Chief Minister Raman Singh had ignored all norms to favour AgustaWestland for purchasing the chopper in 2007.
The Chhattisgarh government bought Agusta A-109 power helicopter from AgustaWestland in 2007 for USD 6.5 million.
Earlier, instead of calling tender as per Store Purchase rules, the government approved relaxation from calling global tender on the ground the helicopter was a specialised product.
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Later, a tender was floated for a specific model of chopper in which only AgustaWestland was qualifying, Baghel said.
The chopper, a model of which was procured by the Jharkhand government from the same company at a cost of USD 5.59 million, was bought by Chhattisgarh for USD 6.5 million, which clearly indicates misappropriation in the acquisition process, the Congress leader added.
The dealer intimated (in March 2007) that the purchase contract would be signed directly between the Chhattisgarh government and the manufacturer (Agusta) and assured delivery by September 2007.
However, the state government in April 2007 asked the company to curtail the price to USD 5.59 million (at which it supplied the same model chopper to Jharkhand (in 2005-06). The company, however, refused and the proposal was cancelled.
The government later floated a global tender and finalised the deal with the same company for USD 6.5 million, causing heavy losses to the state exchequer, he said.
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The CAG report had underlined that the reply of the Government on the issue was not acceptable as it failed to finalise the first offer in time, Baghel said.
Purchasing the same brand and model of helicopter from the same company at higher price led to extra expenditure, he said and added Prime Minister Narendra Modi should get the deal investigated.
The Public Accounts Committee (PAC) of Chhattisgarh Assembly had examined the facts after the issue was raised by the CAG. Later, the government submitted a factual report over the issue to the CAG, the Minister added.