When can a succeeding aircraft be authorized to take off from an intersecting runway in a nonradar environment?

In a nonradar environment, the primary focus is on ensuring safe separation between aircraft during critical phases like takeoff and landing. Authorizing a succeeding aircraft to take off from an intersecting runway is contingent on the position of the preceding aircraft relative to the intersection.

The correct timing for this authorization occurs when the preceding aircraft has passed the point of the runway intersection. At this point, it is safe for the succeeding aircraft to begin its own takeoff roll because sufficient separation is guaranteed, minimizing the risk of a collision.

The other scenarios do not ensure this necessary safety margin. For instance, if clearance is given when the preceding aircraft has just started its roll or is still airborne but hasn't cleared the intersection, there’s a higher risk of incursion or collision. Proper separation is fundamental to air traffic control operations, particularly in environments lacking radar surveillance.