The Indian Directorate General of Civil Aviation (DGCA) has asked Pratt & Whitney to urgently detect the cause of IndiGo's mid-air engine failures.
IndiGo experience three in-flight engine failures in August on flights: Madurai to Mumbai, Kolkata to Bangalore and Amritsar to Delhi. In each case, the aircraft were required to return due to engine failure.
DGCA wants P&W to identify the possible causes and recommend mitigation measures for early detection of such incidents.
According to the DGCA, IndiGo conducted Boroscopic Inspection (BSI) of the engines involved in the in-flight shutdown, wherein damage to the Stage 1 blades of the High Pressure Turbine (HPT) was observed on the engines involved in the two incidents on August 29. However, no anomaly was observed in the BSI of the affected engine at Amritsar in the September 3 incident. No abnormality was observed in any of the engines.