"The Rolls-Royce chief executive officer, Warren East, said on Tuesday that ANA’s problem was a “manageable issue”. ANA’s “intensive” use of the engines had cau

"The Rolls-Royce chief executive officer, Warren East, said on Tuesday that ANA’s problem was a “manageable issue”. ANA’s “intensive” use of the engines had caused the blades to wear more quickly than usual, he said." Is the root cause an airline operating procedure?