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The critical inspection process for ensuring the safety of control cables in aircraft involves nondestructive testing methods. These methods are specifically designed to evaluate the integrity of materials and components without causing any damage, allowing for an assessment of the internal structure of the control cables that visual inspections alone cannot achieve.

Nondestructive tests, such as magnetic particle inspection or ultrasonic testing, can identify unseen defects, such as cracks, corrosion, or other structural weaknesses that could compromise the safety and functionality of the cables. Given the critical role that control cables play in the operation of an aircraft—controlling surfaces like ailerons, elevators, and rudders—it's important to use methods that provide a comprehensive safety evaluation without compromising the cables.

While other options like visual inspection, regular functional testing, and periodic lubrication contribute to overall maintenance and safety, they do not offer the same level of detailed inspection that nondestructive testing provides. Visual inspections may overlook internal issues, regular functional testing checks only the operational aspect, and lubrication is important for preventing wear but does not assess structural integrity. Thus, nondestructive testing stands out as the necessary process for ensuring the utmost safety of control cables in the aviation context.