"The corrective action actions taken are inconsistent and not commensurate with the severity of the FOQA (Flight Operations Quality Assurance) events," DGCA Director (air safety) Maneesh Kumar said in the notice to IndiGo's Head of Training Sanjiv Bhalla.
The DGCA audit focussed on the area of occurrence reporting, FOQA monitoring and analysis, implementation of Safety Management System, aircrew training, flight operations and airworthiness.
The show-cause notice has also been sent to senior airline executives Rakesh Srivastava, Ashim Mitra and Hemant Kumar.
The DGCA has asked the four airline executives why action should not be taken against them in view of the lapses and violation of the regulatory requirements. It has given 15 days' time to the executives to respond.