The helicopter was flying on a Visual Flight Rules (VFR) flight plan from its operating base near Cranfield Airport on a direct track to a private site near Dublin. The weather on departure was suitable for VFR flight but, as forecast, deteriorated markedly in the area of Snowdonia with low cloud and rain. The helicopter flew over a witness 4.3 nm southeast of the accident site before disappearing into the cloud. Shortly afterwards it struck the east side of Rhinog Fawr Mountain, fatally injuring the five occupants.
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