How far can wake turbulence from a helicopter extend?

The correct answer indicates that wake turbulence from a helicopter can extend up to three rotor diameters. This is important for understanding how to safely operate around helicopters and avoid potential hazards associated with wake turbulence.

Wake turbulence is created by the rotor blades of helicopters as they churn through the air, generating vortices that trail behind them. These vortices can persist in the air for a period of time and can pose a risk to other aircraft or ground personnel. The three rotor diameter guideline allows for a practical assessment of the influence of this turbulence, as it helps establish a safe distance for other aircraft to maintain when flying near a helicopter that is hovering or taking off.

Maintaining this distance is crucial during flight operations to ensure other aircraft do not encounter these strong and potentially hazardous vortices which can lead to loss of control, particularly for smaller or lighter aircraft that are more susceptible to such disturbances. This understanding helps pilots and operators manage their operations safely in the vicinity of helicopters.

The other options suggest shorter distances for the effect of wake turbulence, which do not adequately account for the strength and reach of the vortices generated by helicopter rotors. Therefore, the emphasis on three rotor diameters provides a more accurate and safety-conscious standard for maintaining separation in air traffic and ground