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of the aircraft. At a glance, the pilot can determine a recommended speed (V speeds) or if speed adjustments are needed. Single and multi-engine aircraft have common markings. For instance, the green arc indicates the normal operating range of the aircraft, from V_S1 to V_NO. The white arc indicates the flap operating range, V_SO to V_FE, used for approaches and landings. The yellow arc cautions that flight should be conducted in this range only in smooth

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