Young Paul,
thanks for your response.
I was wondering about the 240 knots speed restriction set by the FMC but your explanation sounds very logical. During the descent it's quite hard keeping the speed exactly on 250 knots (except when flying on the LVL Change mode, 737-600/900).
Next questions which comes up is how the CI can be specified and how it can affect flight management speeds?
Marcel_MPH
