The incident took place on October 12 when the company Varva Aviation's chairman was flying to Pune from Goa and the aircraft engine developed problem, DGCA sources said.
"We have grounded the pilot and are investigating the incident," a source said.
The aircraft VT-VCA was registered with the DGCA in 2012.
The pilot cleared transit inspection without reporting any snag, an official said, adding it was informed that the Augusta 109 helicopter carrying the company's chairman to Pune from Goa via Kolhapur was repaired by "car mechanics".
As part of the aviation safely norm, only qualified aircraft maintenance engineers are allowed to inspect and repair aircraft or helicopter engines.
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