何为绿点速度？GREEN DOT speed
DEFINITIONGreen dot is an optimized speed. It is an approximation of the best lift to drag ratio.
Flying at green dot speed provides the best climb performance.
Green dot is:
‐ The final takeoff speed
‐ The target speed in managed mode, when in CONF 0, when the approach phase of the FMS is
active
‐ The drift down speed, in case of an engine failure.
最大升阻比速度，空客的绿点速度，对应波音里面的飘降速度Driftdown speed
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