1/ The shaft technical issue on the 225 is fully understood.
2/ Crack Prevention is maximized (but not eliminated) by shaft cleaning and the new oil jets.
3/ Crack Detection is ensured by NDI inspections and/or M’ARMS in-flight monitoring.
4/ With the in flight Mod45 monitoring system, the pilot is informed at all times of the
shaft condition and can return to base or land.
5/ The probability to have a bevel gear crack not detected by M’ARMS or NDI,
leading to in-flight rupture and ditching is lower than 10 to the power 9 /FH, (1 per billion) which is more severe than the certification standards.
6/ With all the safety barriers implemented the shaft rupture risk is now eliminated
(but the risk to find a crack is not completely eliminated).
7/ The Emergency Lubrication System wiring discrepancy has been corrected. New
improvements are upcoming to restore the 30’ flight time in case of ‘total oil loss
Not completely out of the woods. Read between the lines.