OK but once you have demonstrated your gearbox passes that test, once then its done. i.e its not an issue if you come out later and say our gearbox can't run for 30 mins or there is an accident where lubrication was lost and the gearbox was unable to run for 30 mins.
I guess what I'm saying is that there is an assumption that once that initial test is in the bag and the 30 min demo box is ticked then it is assumed that future failures are the anomaly and not the initial test..?