What is required for unique loads before flight evaluation?

Before flight evaluation of unique loads, static lift by crane is essential as it ensures that the load can be safely handled, lifted, and stabilized before being attached to an aircraft. This procedure allows for the assessment of the load's weight distribution, center of gravity, and overall integrity, confirming that it can be securely transported and does not exceed the limits of the aircraft's capabilities. As unique loads often involve unconventional items or configurations, this step is critical in mitigating risks associated with unusual aerodynamic properties or potential shifting during flight.

Other considerations, such as aircraft inspection, emergency procedure review, and weight verification, are also important in the overall sling load operation but do not specifically address the unique nature of the load in question. Therefore, while these aspects are part of the standard protocols, they do not replace the necessity of conducting a static lift to evaluate the load's behavior and safety. This makes static lift by crane the most pertinent requirement for unique loads before conducting a flight evaluation.