What do propellers have to do with this discussion
What does overspeed have to do with this discussion
What's a GE36?
Matter of fact, as I mentioned earlier, fans (& propellers) are probably not germane to this CO GE90 incident.
The GE36 was GE's UDF (Un-Ducted Fan) -- a response to high fuel prices of 25 years ago. While it had outstanding fuel burn, it was too noisy and too complex.