I tend to agree with psyclic, CTD, now that I've heard that other alisons operating in less strenuous circumstances don't suffer 'chips' and other engine headaches as much as police alisons, perhaps there is substance to it. It is common in this industry to read about compressor blades / chip lights / combiner gearbox debris playing up on the C250F. I couldn't finger maintenance in our instance...perhaps it's me!!!!!!!
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Thermal runaway.