COST INDEX / WIND COMPONENT
have a question in my mind I can't find any answer...
We know on the Airbus (320s) with managed speed and fixed COST INDEX (CI=20 for exemple), the aircraft calculate his optimum speed according to the wind component its has in the computer you inserted.
We also know that if there is tail wind for exemple, the FMGS computes a lower Mach number as the tail wind component increase (to let the wind work and save fuel) ...
Can this managed Mach number come up to the one corresponding to the one you would have if you had inserted CI=0 ?
If yes, do you know from how much tail wind in knots, the Mach number is actually the one corresponding of CI=0 ?
Thanks a lot !!