What minimum visibility is required for an approach clearance?

An approach clearance for an aircraft typically requires a minimum visibility of 1 statute mile (SM) reported ground visibility. This standard is in place to ensure that pilots have a sufficiently clear view of the runway and surrounding environment, allowing for safe navigation during the approach phase of landing.

Having a minimum visibility of 1SM means the pilot can visually identify the runway environment at a distance that is generally adequate for making final approach decisions and ensuring a safe landing. This visibility also supports the requirement for maintaining situational awareness and executing necessary visual references for descent, approach, and landing maneuvers.

The options reflecting higher visibility requirements, such as 3SM, 5SM, or 2SM confirmed by ATC, are not the minimum conditions for obtaining an approach clearance. While these higher visibility conditions might be preferred or required in different contexts or specific operations, the regulatory minimum established for standard approach procedures is indeed 1SM.