On the related note, what if its the oil pressure dropping during negative G manouvers and causing the engine to seize? Oil pumps are driven by the engine, so pressure may fall below minimum - lubrication is gone, but the engine is still revving as the propeller still drives the engine.
AFAIK this was a problem with constant speed propellers as well, since they were hydraulically operated on many aircraft and could cause the engine to overrev.
I'll give it a check.
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