The S76 MGB emergency procedure flows into monitoring for increase in vibration, torque and noise level.. I wonder if this failure has caused a rethink and if the design differences in gearboxes would change the result in a catastrophic failure of a sun gear? Over the years the loss of oil and dry run time on a gearbox have been topical but again, if any of those cracks exist and you have to contend with a run dry situation, (now things are really becoming very hypothetical..) then how would those sun gears or any other component with subsurface cracks respond?
The comment below has just started me thinking..
"Following that, given that it might not be possible to assess the fatigue reliability of internal gearbox components, it recommends EASA require a fail-safe main gearbox, in which no failure of an internal component leads to a catastrophic failure." (
https://www.verticalmag.com/news/nor...a-type-design/)