What is the purpose of the turn-and-slip indicator?

The turn-and-slip indicator is designed specifically to measure the direction, rate, and quality of a turn while an aircraft is in flight. It helps pilots understand how the aircraft is performing during maneuvers, especially when making turns. The indicator typically includes a small ball or a needle and a circular dial; the ball assists in determining whether the aircraft is in a coordinated turn. If the ball is offset from the center, it indicates that the turn is uncoordinated, potentially resulting in a skid or a slip.

This tool is crucial for maintaining control and ensuring that the aircraft is turning efficiently and safely. In contrast, other instruments serve different purposes: some measure altitude, others display airspeed, and others indicate the rate of climb, thus reinforcing the specific role of the turn-and-slip indicator in the cockpit.