Up to the failure of the shaft in question....everyone was happy that the monitoring system in place at that time would detect any failures too.
With the changes made as a result of the shaft failure....I guess we should be all happy with the situation now.....right?
One Man's opinion here....as a Pilot...not an Engineer....but I would prefer the testing be done in a Clean Room rather than the aircraft I am flying.
Am I being a Scaredy Cat here?