The development has come around a time when the Tata Group airline has come under intense scrutiny of the regulator following the Air India Ahmedabad plane crash, which took the lives of over 280 people. A few weeks back, the regulator flagged that nearly 15 aircraft of the Tata Group airline have been functioning without a certificate of airworthiness, which is a crucial check that ensures safety and security in air travel. DGCA had also raised concerns related to the over-usage of several aircraft components to three senior officials of the airline, the Economic Times had reported.