Final answer:
The green arc on an airspeed indicator represents the normal operating range for the aircraft. It indicates the range of airspeeds that the aircraft can safely operate within. It provides the pilot with a visual indication of the allowable airspeed range for the aircraft.
Step-by-step explanation:
The green arc on an airspeed indicator represents the normal operating range for the aircraft. It typically indicates the range of airspeeds that the aircraft can safely operate within.
For example, in an airplane, the green arc may indicate the range of airspeeds from the stall speed (the minimum speed at which the aircraft can maintain level flight) to the maximum structural cruising speed (the maximum speed at which the aircraft can safely operate without causing damage to its structure).
The purpose of the green arc is to provide the pilot with a visual indication of the allowable airspeed range for the aircraft.