1. Loss of Power:
- The helicopter experiences a sudden loss of power as the failed engine stops providing thrust.
2. Autorotation:
- The pilot initiates autorotation, a flight technique that allows the helicopter to descend while generating lift without engine power.
- The pilot reduces the collective (main rotor blade pitch) to minimize drag and allows the helicopter to enter a descent.
3. Airspeed Increase:
- As the helicopter descends, it picks up airspeed, which helps maintain rotor RPM (Revolutions Per Minute).
4. Directional Control:
- The pilot uses the remaining engine (if multi-engine helicopter) or the tail rotor (single-engine helicopter) to maintain directional control and balance.
5. Glide Ratio:
- The helicopter's glide ratio (distance traveled for a given amount of descent) depends on its design and forward airspeed.
6. Suitable Landing Site:
- The pilot searches for a suitable landing site, considering factors such as terrain, obstacles, and available space.
7. Flares and Touchdown:
- As the helicopter approaches the ground, the pilot flares (raises the helicopter's nose) to reduce the descent rate and cushion the landing.
- The helicopter touches down gently, making use of any remaining forward momentum.
8. Post-Landing Actions:
- Once safely on the ground, the pilot secures the helicopter, turns off electrical systems, and initiates emergency procedures as per the helicopter's flight manual.
Engine failure in a helicopter is a challenging situation, and it's important for pilots to receive thorough training in autorotation and emergency procedures. Their skill, quick thinking, and sound decision-making are vital in safely managing engine failure scenarios.
