Within the previous operating year, IndiGo and GoAir experienced numerous in-flight engine shutdowns or rejected takeoffs. It was determined that the third-stage low-pressure turbines and gearbox required replacement ahead of normal maintenance schedules.
India’s civil aviation regulator DGCA directed the airlines to replace the PW1100G engines with improved versions of the engines. To begin with, all aircraft with more than 2,900 hours in service to have at least one of the upgraded engines installed, and all engines are to be replaced in 2020.
Indian authorities have instructed the country's Airbus A320neo operators to replace the Pratt & Whitney PW1100G engines on the type with an upgraded version of the powerplant by the end of January 2020.
IndiGo reported, “We are working with both P&W and Airbus on mitigation so that we have enough modified spare engines by January 31, 2020.” This was to ensure that all scheduled flights could be serviced.