normal operating speed

i. The level-flight speed of an aircraft at its design altitude, with the engine operating at no more than 75% of its rated horsepower.
ii. The maximum operating speed under any condition. The speed is represented by the symbol VNO , which has now been replaced by VMO . This speed is less than the maximum demonstrated diving speed (VDF )–a speed that normally is not intended to be reached except during certification process.

Aviation dictionary. 2014.

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