This will “likely mean that some aircraft will be taken out of service,” said the head of the agency, Steve Dickson, on Sunday.
A first check of the engine failure on Saturday shows “that the inspection intervals for the hollow fan blades should be increased, which are unique to this engine model and are only installed on the 777 type.”
Meanwhile, the Japanese Ministry of Transport ordered a flight ban for aircraft equipped with the affected engines in their own country as a precaution. This affects 13 aircraft from Japan Airlines (JAL) and 19 aircraft from All Nippon Aiwars (ANA), as the Ministry announced in Tokyo.
On Saturday, as a result of the engine failure, large parts of the aircraft fell as debris in residential areas not far from Denver. The United Airlines (UA) Boeing 777 landed safely at Denver International Airport. 
The re were no reports of injuries – either on board or on the ground.
The machine was on its way from Denver to the capital of Hawaii, Honolulu. According to the FAA, the right engine of the machine failed shortly after takeoff.
Bild: (APA / AFP / Broomfield Police Department / -)
United Airlines is the only airline that operates jets with the PW4000 engine type in its fleet.
The Boeing 777-200 with 231 passengers and ten crew members was on its way to Honolulu when an engine went up in flames. Nobody was hurt.
United said it is voluntarily removing 24 Pratt & Whitney 4,000-series Boeing 777 aircraft from its flight schedule as an immediate precaution. It should be ensured that these aircraft meet the strict safety standards and can be put back into service.
The re are currently 52 of these aircraft in the fleet – 24 active and 28 in storage.
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https://www.nachrichten.at/panorama/weltspiegel/nach-zwischenfall-us-luftfahrtbehoerde-prueft-boeing-777-triebwerke;art17,3355764
incident aviation authority checks Boeing engines
