Dual G5 and LPV vs ILS

[MICKEY]

Went flying today with another mooniac, and was having difficulty with the Glide Slope on the G5's.   

From the IAF to the FAF on LPV approaches, I had no difficulty and the Garmin 430W was showing LPV.  As I passed the FAF, the Glide slope did not transition to standard vertical guidance and remained with " No GP" (or No Glideslope Precision), without an indicated.  The LNAV function continued to work.  It even showed LPV on the HSI G5, just No GP. 

We tried this on two approaches today.  The ILS worked just fine and showed LNAV and GS without a problem.  

And yes all the data on the 430W is current and up to date, including Nav Data and Terrain. 

Thoughts on the cause of this?  Is this a G5 issue?  Is there a wiring problem from the 430W?  As the 430W showed LPV in the Left lower corner I don't think it was a RAIM or GPS source issue. 

Has anyone else had this issue?

Edited March 6, 2019 by MICKEY

[Marauder]

Went flying today with another mooniac, and was having difficulty with the Glide Slope on the G5's.   
From the IAF to the FAF on LPV approaches, I had no difficulty and the Garmin 430W was showing LPV.  As I passed the FAF, the Glide slope did not transition to standard vertical guidance and remained with " No GP" (or No Glideslope Precision), without an indicated.  The LNAV function continued to work.  It even showed LPV on the HSI G5, just No GP. 
We tried this on two approaches today.  The ILS worked just fine and showed LNAV and GS without a problem.  
And yes all the data on the 430W is current and up to date, including Nav Data and Terrain. 
Thoughts on the cause of this?  Is this a G5 issue?  Is there a wiring problem from the 430W?  As the 430W showed LPV in the Left lower corner I don't think it was a RAIM or GPS source issue. 
Has anyone else had this issue?

What approaches were you flying?


Sent from my iPad using Tapatalk Pro

[toto]

I've flown several LPV approaches and haven't seen this behavior. But the manual suggests that the approach may have lost VNAV after the FAF (see below). 

 

2.3.1.2 VERTICAL DEVIATION (GLIDEPATH) INDICATOR - GPS 
SOURCE
The Vertical Deviation (Glidepath) Indicator (VDI) also appears to the left of the 
altimeter (PFD page) and to the right of the compass rose (HSI page) during a GPS 
approach. The glidepath is analogous to the glideslope for GPS approaches supporting 
WAAS vertical guidance (LNAV+V, L/VNAV, LPV). The Glidepath Indicator appears 
on the G5 as a magenta diamond. If the approach type downgrades past the final 
approach fix (FAF), “NO GP” is annunciated.

[MICKEY]

8 hours ago, Marauder said:

 

What approaches were you flying?


Sent from my iPad using Tapatalk Pro

 

I was flying the KESN RNAV 28 and KILG RNAV 01.

 

8 hours ago, toto said:

I've flown several LPV approaches and haven't seen this behavior. But the manual suggests that the approach may have lost VNAV after the FAF (see below). 

 

2.3.1.2 VERTICAL DEVIATION (GLIDEPATH) INDICATOR - GPS 
SOURCE
The Vertical Deviation (Glidepath) Indicator (VDI) also appears to the left of the 
altimeter (PFD page) and to the right of the compass rose (HSI page) during a GPS 
approach. The glidepath is analogous to the glideslope for GPS approaches supporting 
WAAS vertical guidance (LNAV+V, L/VNAV, LPV). The Glidepath Indicator appears 
on the G5 as a magenta diamond. If the approach type downgrades past the final 
approach fix (FAF), “NO GP” is annunciated.

I had no messages and everything was nominal. Before, at, and after the FAF No GP was displayed with LPV showing on the 430w. 

[Jesse Saint]

Hold the “Ent” key on the 430W when you power it up to get into setup. The first page to show up will be ARINC 429 setup. At the bottom of the screen it should have a Vertical setting that will show “Disable Labels” or “Enable Labels”. If is is disabled, this is your problem. Change to Enable and problem solved. 

[MICKEY]

8 hours ago, Jesse Saint said:

Hold the “Ent” key on the 430W when you power it up to get into setup. The first page to show up will be ARINC 429 setup. At the bottom of the screen it should have a Vertical setting that will show “Disable Labels” or “Enable Labels”. If is is disabled, this is your problem. Change to Enable and problem solved. 

You’re a Saint! Where are you out of? I owe you a beverage of your choice. 

[Jesse Saint]

X35 airport in north Florida. Diet Pepsi is my beverage of choice. :-)

[carusoam]

Jesse,

When you get a chance...

You May want to put your location on your avatar or signature line...

Let us know if you need a hand with that...

Best regards,

-a-

[MICKEY]

On 3/6/2019 at 4:22 PM, Jesse Saint said:

X35 airport in north Florida. Diet Pepsi is my beverage of choice. :-)

Flew tonight. After making that change and the Glideslope was spot on. Thanks for your help. 

[bradp]

Is that the @Jesse Saint of RV fame?  Welcome to Mooneyspace.  Good to have you.  

[Jesse Saint]

One and the same.

[Allrhodesl2rome]

On 3/6/2019 at 3:12 PM, MICKEY said:

You’re a Saint! Where are you out of? I owe you a beverage of your choice. 

hello I tried this and I was unable to exit out of the menu. I could scroll through the various Menus but couldn’t get out. Hopefully I’m just pushing the wrong button. Anyone else run into a similar issue?

[carusoam]

Welcome aboard Allroads...

Best regards,

-a-