By Jeff Wise AVIATION UPDATED FEB. 21, 2021 https://nymag.com/intelligencer/2021/02/why-do-boeing-777-engines-keep-exploding.html .... In all three cases, the aircraft were among the oldest in the worldwide 777 fleet, having been delivered in the first two years after the model was introduced in 1995. While the Pratt & Whitney PW-4000 engines in each case were likely not original to each plane — engines are regularly removed from planes for routine maintenance, then installed on different aircraft — the engines are generally of similar vintage to the aircraft on which they fly. In the 2018 incident, the engine that failed had been built in 1996 and had accumulated 77,593 hours flight hours and 13,921 cycles (combined takeoffs and landings). The blade that failed in the 2020 incident had experienced 43,060 flight hours and 33,518 cycles.
There was a fourth incident involving a PW-4000 engine and a superannuated Boeing on Saturday. A 30-year old Boeing 747 operating as a freighter suffered an uncontained failure of one of its Pratt & Whitney engines shortly after takeoff from Maastricht Airport in the Netherlands at 4:11 p.m. local time. The flight was en route to New York and dumped fuel before landing safely land in Liege, Belgium. Falling debris injured one person on the ground and damaged cars.
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