What is the purpose of colored reference markings on the airspeed indicator?

The colored reference markings on the airspeed indicator serve to indicate stall speeds during different configurations. These markings are crucial for pilots as they provide visual cues about the safe operation of the aircraft within various phases of flight, particularly during approaches and maneuvers where stall risk increases. Each color corresponds to a specific airspeed range, helping pilots to quickly identify safe speeds to prevent stalling. This information is essential during critical phases such as takeoff, landing, and slow flight, ensuring that pilots maintain adequate control over the aircraft. Understanding and recognizing these markings enhances situational awareness and promotes safety by reducing the likelihood of unintentional stalls.