Ground Self-Defense Force helicopter accident investigation report details revealed. Cause is said to be a phenomenon called “rollback” in which the engine's output gradually decreases.
Measures to prevent recurrence include conducting detailed inspections of engine-related parts, establishing emergency operating procedures in the event of a rollback, and ensuring that everyone is thoroughly informed. The contents of the report are expected to be published soon.. engine… engine…. engine... engine. The helicopter crashed off the coast of Miyakojima in Okinawa Prefecture, killing 10 people.