Thanks guys for your inputs. By any chance entering CRZ WINDS (that are shown on ND) FMGS calculates predictions till TOD and after that descend winds take over?
I tried it recently entering 100kt headwind and saw the arrival time at destination and then put in 100kt tailwinds and saw the arrival time. There was almost a diff of 10-12 min. I would assume winds entered would be used by FMGS till TOD
and not just after 200 n.m.
As per my company SSOP's "Either put winds for every cruise way point or just enter trip winds, if short on time "