When the visibility is 6/5/6, what determines if departure is allowed?

In aviation, takeoff and landing operations are subject to specific minimum visibility requirements, which can vary depending on the airport and its associated regulations. When visibility is reported as 6/5/6, it indicates the horizontal visibility limits at the airport, and pilots must refer to the airport-specific takeoff minimums to determine whether it is safe to depart. These minimums are established by the aviation authority and can differ based on factors such as the airport's layout, the presence of instrument landing systems, and other operational considerations.

For instance, some airports may have stricter visibility requirements for certain types of operations or runway configurations, whereas others may have more lenient standards. If the visibility meets or exceeds the established minimums for the specific airport, departure is permitted; if not, pilots must adhere to the restrictions in place, which could involve a delay or cancellation of the flight.

Other options, while relevant in different contexts within aviation, do not directly influence the decision to depart based on visibility conditions alone. Flight duration, type of aircraft, and weather conditions on a route affect overall operational planning but are not the primary determining factors in assessing whether takeoff is permissible under specific visibility conditions at an airport.