Problem on Descent

[Andrew Ayad 1]

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.

[Spin737 102]

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

[crazy voyager 13]

What weather did you use?

 

Did you enter the expected winds in the FMC?

[Levkov 8]

Was there a route discontinuity in the star?

[Richard McDonald Woods 168]

How accurately did you follow the STAR?

[Andrew Ayad 1]

There wasn't a route discountinuity in the STAR, I am using Active Sky 2012 and I did not enter the expected winds along my route.

[crazy voyager 13]

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.