In February 2018, after in-flight failures of the PW1100G with its high pressure compressor aft hub modified, apparently caused by problems with its knife edge seal, European Aviation Safety Agency (EASA) and Airbus grounded some A320neo family aircraft until they were fitted with spares.As of February 2018, P&W engines had flown 500,000 hours since introduction and 113 P&W-powered A320neo family aircraft were operated by eight customers.Airbus then stopped accepting PW1100G engines.