At least 18 of brand new Sukhoi 30 MKI's delivered to the Indian Air Force had been fitted with secondhand engines, according to a recent report. It is claimed that Hindustan Aeronautics Limited (HAL) fitted the secondhand engines without the knowledge and approval of the defence ministry. The report stated that AL 31FP engines fitted in certain aircraft was in Cat B condition at the time of delivery to Indian Air Force (IAF). 

The IAF's frontline Sukhoi 30 MKI is a multipurpose twin-seater supersonic fighter aircraft which is powered by two AL-31FP aero engines.