Helicopter engine malfunction signal:
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Helicopter in flight
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Helicopter approaching and landing
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Helicopter whirls in place, flies away
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Helicopter flies (fast)
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Lands and flies away, A helicopter approaches
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Helicopter approaching and hovering
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Helicopter flies slowly
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Helicopter lands, shuts down
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Helicopter flies away
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Helicopter Warning System
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Helicopter shuts down
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Helicopter takes off
★★★★★