G1000 NXi missing RNAV approach

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Rich
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Re: G1000 NXi missing RNAV approach

Post by Rich »

Asked Foreflight about the "Y" procedure and got a pretty detailed response. Abridged for brevity:

The RNAV (GPS) Rwy 30 is a Special approach procedure. It is only available to authorized users. All Special approach procedures are in the GPS database because aircraft that are authorized to fly them still have to load the procedure from the database. Only authorized users of the Special Approach procedure are provided an approach procedure chart from the procedure sponsor.
...
Flying an approach without the chart or authorization would likely lead to a pilot deviation.


This makes sense, as the NOTAM for it refers to radio altimeters and such. I wonder, though, what makes Wenatchee so special?
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Re: G1000 NXi missing RNAV approach

Post by av8sj »

Thanks for investigating, Rich. Makes sense. As for your question about what makes Wenatchee special, the airport is in a valley surrounded by terrain. There are airlines that fly from there to Seattle. So it makes sense there is a special approach.
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Re: G1000 NXi missing RNAV approach

Post by mfdutra »

Aspen (KASE) has a special approach that's not published in the Jeppesen binder. It was developed for NetJets (and probably others) and can only be flown by their big iron, like Gulfstreams and Falcons. The little jets (GPS only) can't fly it.

The critical question of these approaches is: if the GPS gets jammed now, will you die?
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Re: G1000 NXi missing RNAV approach

Post by CFIDave »

mfdutra wrote: Thu Mar 23, 2023 9:37 pmThe critical question of these approaches is: if the GPS gets jammed now, will you die?
The FAA has thought of that: Do a search for the VOR MON (Minimum Operational Network). You may not be able to land at your intended destination, but you will be able to land without GPS in IMC.
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mfdutra
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Re: G1000 NXi missing RNAV approach

Post by mfdutra »

My "critical question" was related to RNP-AR approaches. On a lot of them, if you lost GPS inside the FAP, you will die, because you can't just go up on a heading. There's granite in front of you.

That's the reason they require inertial navigators. Even a single inertial navigator, like in the PC-24, allows you to continue an RNP approach for up to 10 minutes, in case it loses GPS reference. You cannot start an approach without reference, but once you start, you can finish it.

On a normal RNAV approach for us, if you lose GPS, you just go up and request vectors. Then you can proceed to a MON airport.
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Re: G1000 NXi missing RNAV approach

Post by pisymbol »

Keep in mind, some of the GPS AR approaches require training as well (alert when GPS does fail). Bottom line: Your avionics are only going to allow you to select approaches it can fly.
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