Which of the following best describes the hydraulic system included in towbar inspection?

The best description of the hydraulic system included in towbar inspection is that it checks for leaks and functionality. This is crucial because the hydraulic system plays a significant role in the operation of tow bars, as it controls the movement and coupling of the aircraft to the towing vehicle. During an inspection, it is essential to ensure that the hydraulic fluid is not leaking, as leaks can lead to a loss of pressure and functionality, potentially causing operational failures during towing.

Additionally, verifying the operational effectiveness of the hydraulic system is vital to ensure safety and reliability. Evaluating both leaks and overall functionality ensures that the system can perform its intended tasks effectively and indicates the general health of the hydraulic components involved.