If you’ve read the AAIB reports on G-REDL and the other two bevel gear failures in the 225’s in 2012 you would also note that HUMS actually picked up these failures several hours before too
But it didn't pick up LN OJF's catastrophic failure. All TRPCS shafts are now run in before being released. Sikorsky is looking at an improved design. There hasn't been any more failures. I am happy flying the 92, I prefer it to the 225 to operate, its predictable and reliable even if the autopilot is no so whizzy as the 225.