What range should the green indicator be in when checking hydraulic fluid level?

The correct answer indicates that the hydraulic fluid level should be in the range of FULL AC or FULL AD on the indicator. This range signifies that the hydraulic system has sufficient fluid for optimal operation, ensuring that all hydraulic components can function effectively without the risk of cavitation or air entering the system.

Maintaining the hydraulic fluid within this specified range is vital for the performance and safety of the T-6A. Inadequate fluid levels could lead to a loss of control surface effectiveness and compromised flight capabilities. Hence, having the hydraulic fluid within the FULL AC or FULL AD range indicates a properly serviced system ready for safe operations.