Which instrument helps indicate coordination in flight by showing slip or skid?

Which instrument helps indicate coordination in flight by showing slip or skid?

• A. Altimeter
• B. Airspeed Indicator
• C. Turn and Slip Indicator
• D. Vertical Speed Indicator

Answer: (C)

In coordinated flight you want to turn without slipping or skidding. The instrument that helps you judge this is the Turn and Slip Indicator. It provides two cues: a rate-of-turn indicator (the needle) and a slip/skid cue (a pendulous ball in a curved tube). When the ball is centered and the turn-rate is appropriate, the aircraft is coordinated. If the ball moves to one side, you’re in a slip (inside of the turn) or a skid (outside of the turn) and need rudder input to bring the ball back to center while monitoring the turn rate. The other instruments measure altitude, airspeed, and vertical speed, but they don’t indicate coordination of a turn.

In coordinated flight you want to turn without slipping or skidding. The instrument that helps you judge this is the Turn and Slip Indicator. It provides two cues: a rate-of-turn indicator (the needle) and a slip/skid cue (a pendulous ball in a curved tube). When the ball is centered and the turn-rate is appropriate, the aircraft is coordinated. If the ball moves to one side, you’re in a slip (inside of the turn) or a skid (outside of the turn) and need rudder input to bring the ball back to center while monitoring the turn rate. The other instruments measure altitude, airspeed, and vertical speed, but they don’t indicate coordination of a turn.