What is the maximum endurance AOA value to maintain during holding speed?

The maximum endurance AOA (Angle of Attack) value to maintain during holding speed is crucial for maximizing the time an aircraft can remain in a holding pattern without gaining or losing altitude. In the T-6A, the correct value for optimal performance during these conditions is indeed 8.8 units.

This value is specifically designed to achieve the best lift-to-drag ratio while ensuring that the aircraft remains at the most efficient point of the performance envelope during holding phases. By maintaining the AOA at this level, the aircraft can maximize its fuel efficiency, which is especially important in extended holding situations where fuel conservation is a priority.

Other values mentioned in the options do not correspond to the maximum endurance AOA for the T-6A, as they fall outside the optimal range that would support endurance performance. Each of these lesser AOA values might result in suboptimal lift or increase drag, which is undesirable in a holding situation where maintaining altitude with minimal fuel burn is the objective. Thus, adhering to the 8.8 AOA ensures the best possible performance during such maneuvers.