What size landing point is necessary for a CH-47 with a long line sling load during nighttime operations?

The necessary landing point size for a CH-47 with a long line sling load during nighttime operations is established primarily to ensure safety and adequate space for maneuverability. The combination of the aircraft's size, the dynamics involved in sling load operations, and the reduced visibility at night requires a larger landing area.

A Size 7 landing point provides the required clear space for a CH-47 to safely operate during these challenging conditions. This size accounts for the longitudinal clear zone needed for the aircraft to effectively execute its mission while maintaining safety for the load being transported. It is designed to minimize risks associated with potential obstacles and to provide room for adjustments, which is crucial when visibility is limited.

In contrast, smaller landing point sizes may not adequately compensate for the operational challenges posed during nighttime, such as depth perception issues and reduced spatial awareness, which can increase the risk of mishaps. Hence, a Size 7 landing point is justified as the correct choice for ensuring safe operations with a long line sling load at night.