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Jeff Nielsen

Why was I too high on RNAV Z RWY 15 APPR to Paro

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This is just a general 'what in the heck happened' question.  I checked AS and the QNH was reported correctly and I didn't see any terrain anomalies.  I'm using ORBX FTX Global and FSDG's Paro scenery.

The question is how did I end up to high on the approach?  Everything looked like it was going well.  I've attached the video.  Skip to about the 4:50:50 mark in the video near the end if it doesn't start out there.  Did I miss something?

Thanks in advance.


 

Edited by Jeff Nielsen
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All RNAV "Approaches" at Paro are Cloud Break Procedures which means their purpose is to get you below the clouds from where you continue visually. You should have noticed that the programmed RNAV procedure in your FMC leads you no lower than the missed approach altitude which is 10320ft at PR808. And PR808 is just over the airport which has an altitude of 7364ft --> you are about 3000ft high above the airport if you fly the RNAV vertical profile until PR808.

Kind regards

Ralf

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3 hours ago, Ralf Stock said:

you are about 3000ft high above the airport

blimey, fancy jeff not checking the charts .......

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for now, cheers

john martin

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There are some great real world videos on youtube of the approach with an A320. They fly in there completely manually turning around in the valley I believe twice... check the vids and you‘ll understand the approach a bit better. I can‘t give any advice as I haven‘t ever tried it out. But as written above, the RNAV approaches are only there to guide you through the clouds, from tere you have to do it manually in a special way. Correct sink rates, speeds and turns are mandatory on this approach and it would have been a little wonder if you had made it on the first attempt.

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,

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Download a copy of the Instrument Flying Handbook free from the FAA here: https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/

Each type of approach (ILS VOR RNV [LPV VNAV]) has either an altitude or a point where from there you either land manually with runway environment in sight or you go around.  The only exception is ILS CAT III but that is a special case where special aircraft equipment and crew training are required.

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Dan Downs KCRP

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36 minutes ago, Jeff Nielsen said:

Thanks for all the replies guys.  I think then, from PR816 I should have been manual descent?  

Not necessarily. Only if you are established in conditions which allow to continue visual (e.g. no or below clouds). Otherwise you continue with a 3,5 degree descent as depicted on the chart until you can establish visual conditions and then decide to land or perform missed approach.

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