What does the white triangle at 4.9 units on the AOA gauge indicate?

The white triangle at 4.9 units on the Angle of Attack (AOA) gauge signifies the maximum range for the aircraft. This indicator is crucial for pilots as it helps determine the optimal AOA for achieving the best distance traveled per unit of fuel consumed, maximizing efficiency during flight. Maintaining AOA at this level is significant for effective aerodynamic performance during cruise flight, ensuring a balance between lift and drag that allows for extended range.

Understanding the function of the white triangle aids pilots in making informed decisions when managing velocity and fuel efficiency, particularly during long flights or while planning descent profiles that optimize fuel use. The other options reflect different aspects of AOA readings but do not pertain to the specific indication of the white triangle at 4.9 units, which is solely about maximizing the aircraft's range.