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ANA announced that it will replace 100 engines on its fleet of Boeing 787 Dreamliners after a series of engine failures caused by corrosion and cracking of engine blades.

The Japanese airline will swap out all of the Rolls-Royce engines on 50 of its 787s, a process that could take three years, according to an ANA spokesperson. ANA currently has five engines that need new repairs but “will replace all the 100 engines for enhanced safety measures,” the company said. The airline has already repaired three engines.

Some of the damage to the engines has been caused by chemicals in the atmosphere, and the problem gets worse as an aircraft completes more flights, ANA said. The airline has already canceled 18 flights due to the problem and four of its 787s remain grounded. The airline does not expect any further cancellations through mid-September.

ANA will be replacing the engine blades as a short-term fix as it work with Rolls-Royce on securing the new engines. “We are working very closely with ANA to minimize the impact on their airline operation,” Rolls-Royce said in a statement.

In 2013, Boeing’s Dreamliners were grounded for four months after US regulators said the 787s needed to resolve a heightened fire risk linked to the aircraft’s batteries.

The Rolls-Royce Trent 1000 engine, used on the Dreamliners, each cost about $20 million. 100 engines at this price could mean a $2 billion cost for ANA, though discounts may be available. All Nippon has the largest fleet of 787s in the world, and has another eight on order.

H/T: CNNMoney

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