Which factor is not associated with the determination of the ACL?

The correct choice highlights that aircraft color does not play a role in determining the ACL, or Aircraft Load Capacity. Factors like the aviation unit's Standard Operating Procedures (SOP), pilot experience, and environmental conditions such as humidity all influence load calculations and operational capabilities.

The SOP provides guidelines for load management, considering various operational scenarios specific to the unit. Pilot experience is crucial, as seasoned pilots have a better understanding of how different loads may affect aircraft handling and performance. Humidity can impact the performance of the aircraft and its engines, thereby affecting how much load can be safely carried.

In contrast, aircraft color is purely an aesthetic choice and does not factor into the technical aspects of load management or performance capability. Hence, it is not associated with the determination of the ACL.