How many minutes must a Category I aircraft wait to start takeoff roll behind a Category G aircraft on the same runway?

In air traffic control, different categories of aircraft require specific separation times to ensure safe operations, particularly when it comes to wake turbulence. A Category I aircraft is typically smaller, while a Category G aircraft is a larger, heavier aircraft.

The reason for a 3-minute wait behind a Category G aircraft is primarily due to the wake turbulence that larger aircraft can generate. This turbulence can pose a significant risk to smaller aircraft, especially during takeoff. The 3-minute separation helps to ensure that the wake turbulence has dissipated enough to allow the Category I aircraft to take off safely without being affected.

Understanding this time requirement is crucial for maintaining safety in operations at airports, particularly on the same runway, where the wake turbulence risk is heightened. This separation guidance is outlined in regulations and reflects best practices in the aviation industry to mitigate risks associated with larger aircraft.