Pilot entered Winds at different levels
I thought the FMGS could calculate the real wind during flight and that putting the winds in, either manually or uplinked, would just save the FMC from doing loads of calculations in order to arrive at correct predictions like EET, ETA, optimum FL, FOB and all stuff of a predictive nature. If it (the FMGC) is not over busy doing one thing it might be better disposed to take on more work.
So in all, by entering in all the winds you will get greater accuracy from an already accurate system and it is less hassle for the computer, the FMGS one. I think it runs on your entered values and then it is not far from calculating the ambient (real) wind(s) therefore less work to arrive at more accurate predictions, dont forget the GPS, Radio aids and IRS/INS are helping along too.
Last edited by Natstrackalpha; 12th Jan 2016 at 09:32.
Reason: Disliked the blend.