Preventative Maintenance ?
Lufthansa has its maintenance inhouse and no doubt carries out preventative checks.Doesnt appear to be the case with Qantas.They have now found faults with several other engines.Why weren't these faults detected earlier?
As Peter Greegg once remarked-----We run our aircraft harder than any other airline.
What he didn't say was that this meant shorter transit times at homebase and therefore less time for adequate checks