India’s civil aviation regulator, the Directorate General of Civil Aviation (DGCA), has issued a show cause notice to IndiGo Airlines following alleged irregularities in simulator training provided to nearly 1,700 pilots, sources revealed on Tuesday, reported the PTI.

The action comes after a detailed review of records and responses submitted by the airline last month.

DGCA's findings suggest that training related to Category C airfields -- considered critical due to complex operational conditions -- was conducted using simulators not qualified for such procedures.