Final answer:
A turn indicator is a device used in aviation to indicate the rate and direction of a turn. It operates on the principles of gyroscopy. There are two types of turn indicators: the turn coordinator and the turn and slip indicator.
Step-by-step explanation:
A turn indicator is a device used in aviation to indicate the rate and direction of a turn. It operates on the principles of gyroscopy. A gyroscope is a spinning wheel or disk that maintains its orientation in space due to the conservation of angular momentum. When a turn is initiated, the gyroscopic principles cause the turn indicator to respond by showing the rate and direction of the turn.
A turn coordinator and a turn and slip indicator are two types of turn indicators used in aircraft. The turn coordinator is a more advanced version that combines the functions of the turn and slip indicator with an inclinometer, which indicates the coordination of turns by showing the balance between the rate of roll and the rate of turn. The turn and slip indicator is a simpler device that shows only the rate and direction of turn.