To be fair we do know:-
Before next flight, install a placard “MAXIMUM CONTINUOUS TORQUE LIMITED TO 70% DURING LEVEL FLIGHTS AT IAS ≥ 60KTS
” in full view of the pilots, in accordance with instructions of
Eurocopter EC225 ASB No.04A009 revision 2.
Because:-
Eurocopter have shown that crack propagation is slower with reduced Maximum Continuous Power (MCP).