The SAAB, if equipped with the original Dowty prop, has counterweights to assist in driving to high (coarse) pitch. Thus oil pressure loss does not result in overspeed.
Here my memory is less clear, but I believe this is how the prop is taken into "autocoarsening" mode (supposedly lower drag than fully feathered) in which it windmills slowly. It seemed to me the Dowty prop was thus less likely to encounter a full fine failure than the HSD prop. (25 years ago I had all the answers on these props!
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