Rotor Pilot,
no we don't have sandfilters. We hardly ever operate in sandy/dusty areas, besides the air-intake of the turbine on the EC120 is well hidden. The air has to go around a lot of sharp corners before getting to the intake.
Also if compressor deterioration was the problem it wouldn't show up intermediately - sometimes on sometimes off!
When the engine starts normal we have quite good numbers.
But you never know when she will run normal or hot (or at least indicate hot).
3top
Any Turbomeca guys lurking here?