The moves involving Pratt & Whitney PW4000 engines came after a United Airlines 777 landed safely in Denver on Saturday local time after its right engine failed. United said the next day it would voluntarily and temporarily remove its 24 active planes, hours before Boeing’s announcement. The manufacturer recommended airlines suspend operations until U.S. regulators identified the appropriate inspection protocol. It said the inlet and casing separated from the engine and two fan blades were fractured, while the remainder of the fan blades exhibited damage. Japan Transport Safety Board said on Dec. 28 that it had found two of the left engine’s fan blades were damaged, one from a fatigue fracture.

Source: Standard Digital February 22, 2021 06:37 UTC