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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 whether 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]