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Andrew Ayad

Problem on Descent

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Dear all,

 

I experienced some problems while descending into KSJC via the ROBIE3 arrival, I programmed the FMS to cross a specific waypoint on the arrival at 8000, LNAV and VNAV were engaged. The aircraft crossed this specific waypoint at a way higher altitude and a message showed up in the FMS "DESCENT PATH UNACHEIVABLE" so I ended up being too high to intercept the Localizer runway 30L, what could be causing the problem, need your help and advice please.

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Try again with some screen shots of your progress, and there will be plenty of suggestions.

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Then you may have had a significant tailwind during descent, something the FMC would not calculate for (since you told it there would be no winds). This can put you off little at a time and if you do nothing to correct will eventually make the descent path unachivable.

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