>> I'd say the fire is from oil burning, probably a bearing fire. Could be the
>> cause or just an after effect.
Bearings/oil or hydraulic fluid are amongst the suggestions in the PPRUNE thread. Also possibly a composite material in the reverse thrust mechanism.
Terrifying for those involved but in terms of stuff working as designed it looks like a success. If parts did break off in the engine there's no evidence of fuselage damage. It's suggested that the nacelle departed some minutes subsequent to the actual failure, vibration and or increased drag at lower altitudes.
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