since the pw1500g mount generates less strain on the turbine rotor assembly than the a320neo's pw1100g, it does not suffer from start-up and bearing problems but still from premature combustor degradation. after 28,000 engine hours in 14 in-service aircraft with a powerplant dispatch reliability of 99.9%, swiss replaced an engine pair in may 2017 after 2,400 h, while airbaltic replaced another one in june. an updated combustor liner with a 6,000–8,000 hour limit has been developed and a third generation for 2018 will raise it to 20,000 hours in benign environments. in july 2018, pratt & whitney announced that the pw1500g had been granted 180-minute etops approval by the faa.