What are the minimum takeoff visibility requirements for an air taxi with two engines when not depicted?

The minimum takeoff visibility requirement for an air taxi operation with two engines, when not specifically depicted in any regulatory guidance or publications, is indeed 1 statute mile (SM). This requirement ensures that pilots have enough visibility to make safe takeoff decisions and navigate effectively during departure. It is crucial to adhere to these standards to minimize the risk of accidents during low-visibility conditions.

The other visibility thresholds, such as 2SM or 3SM, typically refer to requirements for various types of operations or aircraft that are subject to stricter regulations, reflecting higher safety margins. Visibility lower than 1SM may not be sufficient for safe takeoff, as it can impede the pilot's ability to perceive obstacles and properly assess their flight environment.