VFRoohbloodyoohbloodah:
At our Unit, we keep the engines running all the time at ground idle. It's not that bad really when you consider the costs of stopping and starting fifteen times from cold per shift which takes a terrible toll on the bearings and starter generators. By comparison the amount of fuel used keeping it rotors running (albeit slowly) and engines at GI is insignificant over an 8 hour shift. Only problem though: a bit noisy after a while.
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Thermal runaway.