Nick
Presumably airframe manufacturers get data on engine life expectancy from the engine manufacturers, based on empirical research including actual destructive testing, from which the acft manufacturer, along with authorities, establish lifespans based on the relevant spectrum.
Out of academic interest, about how long would an engine statistically last before it would fail at say the 2min 30sec OEI limits? Just interested to know what sort of approx % reserve you guys work to.
What about tranmissions? If there is a 5 minute take off limit of say 100% Tq, what sort of Tq would you expect the MGBX to typically actually catastrophically fail at?