For a drop zone that is 1800 meters long, what is the minimum requirement for green light duration when two C-130s are used?

To determine the minimum requirement for green light duration when two C-130s are used for a drop zone that is 1800 meters long, it is crucial to understand the operational needs for safe and effective parachute deployment.

When conducting parachute operations with multiple aircraft, the green light signals that the aircraft is clear to release their loads, which may include personnel and equipment. The required green light duration is primarily influenced by the length of the drop zone and the speed at which the aircraft will traverse it.

In this scenario, a 1800-meter drop zone requires enough time for both C-130s to safely release their loads across the entire length. The minimum requirement of 15 seconds for the green light is based on calculations that consider the descent rates of parachutes, spacing, and ensuring that all personnel can safely exit the aircraft while maintaining proper separation to prevent collisions during descent.

Thus, the choice of 15 seconds allows sufficient time for both aircraft to fulfill their drop responsibilities while allowing for a safe and controlled situation as the parachutists descend. This period helps in ensuring that all personnel land safely within the boundaries of the drop zone.