M.R Blade behaviour
I seek inputs from experience 135 drivers and engineers. About a month back we started feeling some vertical vibrations which kept increasing slowly in about 15hrs of flying. We did the Vibrex and found one of my main rotor blades out of track. It was Up around 1inch as compared to the other three in hover. The engineer corrected the tracking by bringing this blade down.
After about 10hrs more of flying v felt the same vibrations still but lesser amplitude. At a gap of around 20hrs we did the Vibrex again to find the same blade higher then others..
What can cause the same blade flying up gradually out of track?
Does anyone know of composite degradation of an EC135 blade? And too in causing increased flapping.
Appreciate you inputs if someone has experienced the similar thing.