How many minutes should a Category I aircraft wait to start takeoff after a Category G aircraft has taken off or rotated?

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A Category I aircraft must wait three minutes after a Category G aircraft has taken off or rotated to ensure adequate separation for a safe takeoff. This timing is in place to reduce the risk of wake turbulence, which can significantly affect lighter aircraft. Category G aircraft, typically smaller, generate wake turbulence that can linger in the flight path of following aircraft for a certain period.

After a takeoff, it is essential to allow sufficient time for the wake disturbances to dissipate, especially in a busy air traffic environment. The three-minute interval helps maintain this safety margin, ensuring that the following Category I aircraft can begin their takeoff without encountering hazardous turbulence.

The minimum time for waiting is based on previous operational data and safety studies that indicate three minutes is a safe margin to minimize risks associated with wake turbulence. This consideration is crucial for maintaining safe air traffic operations and protecting all aircraft in the vicinity.