PPRuNe Forums - ETA difference

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littlejet

10th Apr 2007 17:16

ETA difference

Aircraft is 747 - 400
Sometimes there is a +/- 1 min difference between next waypoint ETA on the ND with DATA selected and next waypoint ETA on the RTE DATA, FMS page.
Does somebody know the reason?
Thnx

CONF iture

10th Apr 2007 17:35

I assume ND ETA only takes account of present GS, when FMS ETA includes inserted forcast winds and temps.
The further the waypoint, the bigger chance a difference between both ETA.

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