What is the visibility requirement for mountainous local flights during the day?

The visibility requirement for mountainous local flights during the day is three miles. This standard is established to ensure that pilots have adequate visual reference for navigation and to see and avoid terrain, especially in areas with significant elevation changes. Three miles of visibility allows for enough distance to detect both obstacles and other aircraft, promoting safety during flight operations in mountainous regions. This requirement supports the need for heightened awareness in potentially hazardous environments where terrain can rapidly change, making adequate visibility essential for maintaining control and situational awareness.