normal operating speed

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 The speed is represented by the symbol VNO, which has now been replaced by VMO, This speed is less than the maximum demonstrated diving speed (VDF)–a speed that normally is not intended to be reached except during certification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.