The European airworthiness directive was issued in January 2010. It required repetitive inspections of the IP turbine splined coupling, measurement of the amount of meat left in it and requirement for further inspection or engine replacement as a result.
Did QF carry out these inspections? Were RR supposed to carry them out? Were they performed at all? What were the results of the inspections? What decisions were made by QF and/or RR as a result of these inspections assuming they were carried out? Did QF make a decision at all? Was it RR's call?
Exactly who is responsible for what? What did they know, and when did they know it?
Exactly what is going on? The silence is deafening.