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The airline announced Sunday it was immediately removing the planes “out of an abundance of caution.” The 24 aircraft are part of the 52 777s in the United fleet. The other 28 remain in storage.
The move is voluntary and temporary, United said, and should disrupt only “a small number of customers.”
The announcement came after the FAA issued an emergency order saying it would be stepping up inspections of Boeing 777 airplanes equipped with certain Pratt & Whitney PW4000 engines.
“Based on the initial information, we concluded 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,” Dickson said.
The National Transportation Safety Board said Sunday an initial examination of the Pratt & Whitney PW4077 engine from United Airlines Flight 328 showed that two fan blades were fractured and the remaining blades exhibited damage “to the tips and leading edges.”
These are preliminary findings and should not be taken as conclusive of what went wrong Saturday, but they are still significant.
Investigators believe a fan blade in the engine of the Boeing 777 that experienced a catastrophic engine failure on Saturday came off and took out another blade, a source familiar with the situation told CNN.
According to the most recent registry data, the only airlines that operate with the affected engines are in the United States, Japan and South Korea. United is the only US operator with this type of engine in its fleet.
Japan’s transportation ministry has ordered the country’s domestic airlines to halt operations of Boeing 777 aircraft equipped with Pratt & Whitney PW4000 engines, according to the Japanese transportation ministry.
The NTSB said the “investigator-in-charge for this event along with a powerplant specialist” traveled from Washington to Denver on Sunday morning to assist local NTSB investigators.
The agency said it will be examining “the engine, airplane and the photographs and video taken by passengers aboard United flight 328.” The NTSB will also review the flight data and cockpit voice recorders.
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