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In page Flight instruments:

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These include the Turn-and-Slip Indicator and the Turn Coordinator, which indicate rotation about the longitudinal axis. They include an inclinometer to indicate if the aircraft is in Coordinated flight, or in a Slip or Skid. Additional marks indicate a Standard rate turn.[1]: 3-20 to 3-22  The turn rate is most commonly expressed in either degrees per second (deg/s) or minutes per turn (min/tr).[citation needed]