Bear and Caad
Caad...amzn how simple the faults turn out to be. Just poor part manuafacture,
Bear
As far as I understand the guy who designed this bearing was sure they could not mess up the manufacture.
It is a continuous flow with pressure differentials in play. The system is vented to the atmosphere but only at a start up. In service the way the oil is contained is very clever using centrigul forces. But it DOES require the oil to say in grade..in that sense the oil has to be ON SPEC. Ie right visco and temp and pressure.
That is why oil oxidation due to volcanic dust is a factor in this design. It is in any turbine but esp in this one with this bearing lube design.
Basically the Trent is like a high strung race horse. Wunnerful when all the variables are on the mark.