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BROOMFIELD, CO - FEBRUARY 20: Pieces of an airplane engine from Flight 328 sit scattered in a neighborhood on February 20, 2021 in Broomfield, Colorado. An engine on the Boeing 777 exploded after takeoff from Denver prompting the flight to return to Denver International Airport where it landed safely. (Photo by Michael Ciaglo/Getty Images)

Boeing has recommended that airlines ground all 777s with the type of engine that blew apart after takeoff from Denver this weekend, and most carriers with the planes in their fleets said they would temporarily pull them from service. The U.S. Federal Aviation Administration ordered United Airlines to step up inspections of the aircraft after one of its flights made an emergency landing Saturday. Pieces of the casing of the Pratt & Whitney PW4000 engine rained down on suburban neighborhoods. United is among the carriers that has grounded the planes. The FAA administrator said in a statement Sunday that “the inspection interval should be stepped up for the hollow fan blades that are unique to this model of engine, used solely on Boeing 777 airplanes.”