<P> The turn and slip indicator can be referred to as the turn and bank indicator, although the instrument does not respond directly to bank angle . Neither does the turn coordinator, but it does respond to roll rate, which enables it to respond more quickly to the start of a turn . </P> <P> The turn indicator is a gyroscopic instrument that works on the principle of precession . The gyro is mounted in a gimbal . The gyro's rotational axis is in - line with the transverse (pitch) axis of the aircraft, while the gimbal has limited freedom around the longitudinal (roll) axis of the aircraft . </P> <P> As the aircraft yaws, a torque force is applied to the gyro around the vertical axis, due to aircraft yaw, which causes gyro precession around the roll axis . The gyro spins on an axis that is 90 degrees relative to the direction of the applied yaw torque force . The gyro and gimbal rotate (around the roll axis) with limited freedom against a calibrated spring . </P> <P> The torque force against the spring reaches an equilibrium and the angle that the gimbal and gyro become positioned is directly connected to the display needle, thereby indicating the rate of turn . In the turn coordinator, the gyro is canted 30 degrees from the horizontal so it responds to roll as well as yaw . </P>

Difference between a turn coordinator and a turn and slip indicator