A320 waypoint time

[subria023]

Good day all,

Does anyone know why, sometimes, there is a difference between time estimate over waypoint in the FMGS and the one shown on the top right corner of the ND? It seems that the same waypoint on FMGS1/2 have the same time but not on the ND.

Thank you

[The African Dude]

See below.

FCOM 1.31.45 ROSE NAV MODE/ARC MODE:
TO WAYPOINT, Estimated time of arrival (green), assuming the aircraft will fly directly from its present position to the TO waypoint at the current ground speed.

FCOM 4.2.20 PERFORMANCE FUNCTION
WIND PROFILE
To obtain the best predictions, the flight crew must enter the wind for the various flight phases and for waypoints in cruise.
ON GROUND : During flight planning initialization, enter the winds for the climb and cruise phases using the HISTORY WIND and WIND pages. Enter manually, or with ACARS, different wind values in the climb and cruise phases. The system will compute a wind for all waypoints of the F-PLN using linear interpolation between manual/ACARS entries.
This wind profile will be displayed on the F-PLN B page and is called forecast wind profile. Flight crew or ACARS entries are displayed in large font, and system-computed winds in small font.
The forecast wind profile is used to compute fuel and time predictions, as well as ECON speed/Mach targets.

[CONF iture]

subria,
The point has been discussed here (http://www.pprune.org/4650259-post22.html) also.

[subria023]

Thanks a lot for the answer ! :)