Aviation Glossary - Rate One Turn

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Rate One Turn

Standard Rate Turn: A turn in which an aircraft changes its direction at a rate of 3° per second. The turn indicators are typically 2 minute or 4 minute instruments. In a 2 minute instrument, if the needle is one needle width either side of the center alignment mark, the turn is 3° per second and the turn takes 2 minutes to execute a 360° turn. In a 4 minute instrument, the same turn takes two widths deflection of the needle to achieve 3° per second. The 4 minute turn instrument is usually found on high performance aircraft.

source: FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25A)

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