HONG KONG, China — The engine defect in the Airbus A350 plane that led to the cancellation of dozens of Cathay Pacific flights in early September could have escalated into "extensive damage," according to a Hong Kong probe released Thursday.

Hong Kong-based Cathay Pacific briefly grounded its fleet of A350s for inspections and repairs after a Zurich-bound plane was forced to turn back to Hong Kong on September 2.

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