Alpha maximum speed is indicated by the:

Alpha maximum speed, which is a critical parameter in aviation, indicates the maximum safe operating speed at which an aircraft can be flown when airborne, particularly in a banked turn. Understanding the representation of this speed on the aircraft's speed scale is important for safe aviation practices.

The top of the red strip along the speed scale represents the alpha maximum speed, indicating the limit beyond which there is an increased risk of stalling. This visual cue is crucial during flight as it serves as a warning to pilots to avoid exceeding this specified speed, ensuring the aircraft remains within a safe operational envelope.

By marking this speed with a red strip, the design emphasizes the critical nature of this limit, helping pilots quickly identify it during flight operations. Recognizing and adhering to the boundaries set by the alpha maximum speed is essential for maintaining safe control of the aircraft, especially during maneuvers that may bring the aircraft closer to stalling conditions.