Hong Kong’s flagship airline, Cathay Pacific, said on Tuesday that it had found that 15 of its Airbus A350 planes required repair after an engine component failed on a plane headed to Zurich.

       Cathay Pacific said it had inspected all 48 planes in its Airbus A350 fleet, adding that three of them had been fixed by Tuesday afternoon. It said it had canceled at least 34 round-trip flights since Monday because of the engine issue. All flights were expected to return to operation by Saturday.

       The carrier began the inspections after one of its A350 planes took off from Hong Kong International Airport on Monday before it experienced a problem, dumped fuel over the sea for half an hour and had to return to the airport.

       Rolls-Royce, the maker of the Trent XWB-97 engine that is used in the A350 planes, said Cathay Pacific had secured the spare parts needed to replace its components.

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       Rolls-Royce stock fell 6.5 percent on Monday on the London Stock Exchange after it initially said it could not determine what caused the incident. The stock bounced back partly on Tuesday.

       “Rolls-Royce will now be in a better position to analyze and determine what the root causes of the failure are, and then it will tell Cathay and other operators what should be done next,” said Warren Chim Wing-nin, the deputy chairman of the aircraft division at the Hong Kong Institution of Engineers, a professional organization.

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