Helicopter approaching and hovering:
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Helicopter flies
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Helicopter engine malfunction signal
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Flies past several times, Helicopter whirls
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Shuts down, Helicopter lands
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Helicopter in flight
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Flies away, Helicopter whirls in place
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Helicopter flies (fast)
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Helicopter flies away
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A helicopter approaches, lands and flies away
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Helicopter flies slowly
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Helicopter Warning System
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Helicopter expects jammed
★★★★★