Gavthespotter, gas turbine engines employ labyrinth seals which rely on air tapped of the compressors to function ,this air actually enters the bearing sumps therefore any contaminants which are in that air will possibly enter the engine oil system, hence the reason for checking the filters ,now be a good chap and get off back to the spotters forum
A little harsh Smudge, I feel. I am not an aero engineer and I didn't know that - see my post above - but I was still interested. Now I know, I won't trouble you again. Want to ask me about 30,000 Gauss magnetic fields? Careful, I might give a short sharp answer, because you ought to know.
Those of us on this forum may
not be aircraft engineers, but we
are engineers and we
are interested. Bask in the knowledge that others are asking you the question.
Roger.