The turn coordinator provides a direct indication of aircraft's what?

The turn coordinator is designed primarily to indicate the rate of turn of the aircraft, specifically in degrees per second. This instrument is essential for pilots to maintain a controlled turn, as it allows them to understand how quickly they are changing direction. A standard rate of turn is established, often defined as three degrees per second, which helps pilots make smooth and safe turns.

While the turn coordinator may indirectly suggest bank angles through its indications, its primary function is to communicate the rate of turn. This capability is critical for flight operations, as managing the rate of turn is crucial for maintaining coordinated flight and preventing adverse yaw effects, which can occur when the turn is not properly balanced.

Understanding the rate of turn is vital for navigating and maintaining situational awareness during flight, especially in instrument conditions or when visibility is compromised. Therefore, the correct answer highlights the turn coordinator's main role in aviation instrumentation.