FAA Private Pilot Test Prep

Category - FAA Private Pilot

Ground resonance is most likely to develop when
  1. Taking off in a calm wind
  2. Landing in gusty winds
  3. When a hard landing causes shocks to the helicopter, thereby causing the rotor blades to become unbalanced
  4. Is caused by the blades while the helicopter is hovering in ground effect.
Explanation
Correct answer: C. When a hard landing causes a shock to the helicopter, thereby causing the rotor blades to become unbalanced. If the blades become unbalanced, the rotorscan cause a problem that is like an unbalanced load in a washing machine.
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