What indication shows that a pilot is using maximum range on the AOA gauge?

The indication that shows a pilot is using maximum range on the AOA (Angle of Attack) gauge is the white triangle at 4.9 units. This value represents the optimal angle of attack for maintaining maximum lift-to-drag ratio, which is a vital factor for achieving maximum range in flight. At this setting, the aircraft is optimized for endurance by consuming fuel efficiently while also ensuring the best aerodynamic performance.

Each of the other references on the AOA gauge represents different operational parameters. The red square indicates a higher angle of attack, which suggests that the aircraft may be approaching or exceeding its critical angle, risking a stall. The green chevron generally represents the best lift-to-drag ratio for cruising, which prioritizes performance rather than maximum efficiency for distance flown. The blue dot typically indicates the approach speed for landing, focusing on safe operation rather than maximum range. Understanding these calibrations helps pilots to manage their operations effectively while maximizing the aircraft's performance in various flight phases.