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Generally if you have a main rotor with dampers or a landing gear set with tires and shock absorbers you need to make sure they are serviced properly and regularly. If you've have a eurocopter with the elastomer damper in the main hub, you need to strictly follow the airframe manufacturer's...

Ground Resonance can "just happen", and with catestophic results as seen. The main rotor blades are not simply rigid like you might think, there is some up and down, forwards and backwards (relative to rotation) play - think of it like suspension for the rotor blades. The helicopter's landing...