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Planning an RNAV (GPS) Approach


JesC

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Posted

I have been surprised when flying some GPS approaches to discover they have no vertical guidance in the simulator. The published approach seems to indicate LNAV capability, but no vertical is displayed in the sim during the approach.

My question is if there is if some way to determine if VNAV capability exists for the anticipated approach at the sim airport during preflight planning. (I guess I just don't like surprises during an approach. 😧 )

I am using the RXP GNS 530/430 in P3Dv5.

Thanks for any help or suggestions.

Jesse

 

Jesse Cochran
"... eyes ever turned skyward"

P3D v5.3 Professional, Windows 10 Professional, Jetline GTX, Gigabyte Aorus X299 Gaming 7 mobo, i7 7740X @ 4.9 GHz, Corsair H115i Liquid Cooling, 32Gb SDRAM @ 3200MHz, Nvidia GeForce GTX1080Ti @ 11 GB

ORBX Global + NALC, ASP3D, ASCA, ENVTEX, TrackIR, Virtual-Fly Yoko Yoke, TQ6+, Ruddo+ Rudder Pedals

Posted

IRL you'll find it on AFM, but it's more complicated in sim.

If the weather is not that critical, use the higher minimum of LNAV only, plan for both, and if VNAV turns out to work, then use it, I even do this on 737 as the FMC do sometime go haywire, especially in training condition you might not have full route setup.

Posted
18 hours ago, JesC said:

I have been surprised when flying some GPS approaches to discover they have no vertical guidance in the simulator. The published approach seems to indicate LNAV capability, but no vertical is displayed in the sim during the approach.

My question is if there is if some way to determine if VNAV capability exists for the anticipated approach at the sim airport during preflight planning. (I guess I just don't like surprises during an approach. 😧 )

I am using the RXP GNS 530/430 in P3Dv5.

Thanks for any help or suggestions.

Jesse

 

Jesse, not sure what you mean with "VNAV capability at the Sim airport"

Bear in mind that GPS RNav is not based on terrestrial facilities at the airport like ILS. It works with virtual waypoints which are defined in the database of the RNAV instrument or FMGS of the aircraft you use. So it seems yor GNS doesn' t contain some VNAV capability. This is the case in real world too, which means in that case you just wouldn't be authorized for VNAV approach. This is the case in the real world aswell unless your aircraft has the needed capability within the GPS equipment.

Bernd

P3D V6 -  PC spec: Intel i9-9900 overclocked 5 GHz HT off, 32 GB RAM, GPU Nvidia RTX3090 24GB, 2xM2 SSD, Skalarki HomeCockpit and Jeehell FMGS on a dedicated Server, PF3 for ATC, MCE, GSX, EFB, AS+ASCA+ENV and OrbXpf3-supporter.gif

Posted

@C2615 and @BerndB

Thanks for the input. This has clarified the dilemma for me quite a bit. It seems to mostly be an issue of an aging GPS database (Not to mention the occasional operator error). There doesn't seem to be any way of reliably predicting the anomalies. So its just a matter of being prepared for a lack of vertical guidance as suggested.

Thanks again,

Jesse

 

Jesse Cochran
"... eyes ever turned skyward"

P3D v5.3 Professional, Windows 10 Professional, Jetline GTX, Gigabyte Aorus X299 Gaming 7 mobo, i7 7740X @ 4.9 GHz, Corsair H115i Liquid Cooling, 32Gb SDRAM @ 3200MHz, Nvidia GeForce GTX1080Ti @ 11 GB

ORBX Global + NALC, ASP3D, ASCA, ENVTEX, TrackIR, Virtual-Fly Yoko Yoke, TQ6+, Ruddo+ Rudder Pedals

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