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  #1  
Old 03-08-2014, 11:09 AM
Arlen's Avatar
Arlen Arlen is offline
 
Join Date: Sep 2013
Location: New Smyrna Beach, FL
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Default GRT HXr autopilot and the GPS approach: Need button-pushing help

OK. So I'm learning the systems and this wonderful GRT HXr more and more each time I fly.

I'm trying to set it up to do a fully-coupled GPS/RNAV WAAS approach, but I can't get it to do the vertical/glideslope part....it stays at the altitude that it was holding prior to hitting the approach fix while it's tracking the GPS COURSE perfectly.

I'm selecting the approach in the GNS430W and activating it. The autopilot is ON, and I'm using the HDG bug to turn the assigned vectors toward the fix on the approach at the assigned (A/P-held) altitude. I hit Direct To-Ent-Ent for the assigned approach fix in the 430W...

Somebody please walk me though it from there.

TIA
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Donation to VAF 10.29.18
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  #2  
Old 03-08-2014, 11:47 AM
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dmaib dmaib is offline
 
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Arlen, I installed the HXr in my RV-10 last spring. I would be happy to go over button pushing with you any time at your airplane or mine. I need to be sitting in front of the EFIS to do it, because I cannot remember button names and sequences sitting here at my computer.
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  #3  
Old 03-08-2014, 11:51 AM
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Arlen Arlen is offline
 
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Quote:
Originally Posted by dmaib View Post
Arlen, I installed the HXr in my RV-10 last spring. I would be happy to go over button pushing with you any time at your airplane or mine. I need to be sitting in front of the EFIS to do it, because I cannot remember button names and sequences sitting here at my computer.
David,
That's great! Thanks for "volunteering"

I'm at Massey, Hangar # 6.

Any chance you're available sometime tomorrow, or maybe Monday after work 5 o'clockish?

my cell
386- three one 4 - nine 8 4 four
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  #4  
Old 03-08-2014, 12:01 PM
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Radomir Radomir is offline
 
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Once you're inbound on final approach course (but not sooner), push buttons by going to "ARM" menu and then select "GPSV" option.. that should take care of the vertical part. Keep Lat AP in "GNAV" mode.

http://www.grtavionics.com/Using%20A...20Director.pdf

Page 1 shows those menu options.
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  #5  
Old 03-08-2014, 12:33 PM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
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Quote:
Originally Posted by Radomir View Post
. Keep Lat AP in "GNAV" mode.

http://www.grtavionics.com/Using&#37...20Director.pdf

Page 1 shows those menu options.
While inbound for the approach, have LNAV set to GNAV (so it will do turn anticipation). Once on final, the HXr will automatically switch to ENAV. If you push "missed" it will go back to GNAV.
I have the newest software and that's how mine works. Arm the approach anytime, it switches when on final.

Edit: I should go check wrt the holding pattern behavior, I fly so few, you may be right there. It must be in GNAV to do the holding pattern, as you say.

Last edited by BobTurner : 03-08-2014 at 12:41 PM.
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  #6  
Old 03-14-2014, 04:33 PM
BobTurner BobTurner is offline
 
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Default When to push "GPSV ARM"

Quote:
Originally Posted by BobTurner View Post
While inbound for the approach, have LNAV set to GNAV (so it will do turn anticipation). Once on final, the HXr will automatically switch to ENAV. If you push "missed" it will go back to GNAV.
I have the newest software and that's how mine works. Arm the approach anytime, it switches when on final.

Edit: I should go check wrt the holding pattern behavior, I fly so few, you may be right there. It must be in GNAV to do the holding pattern, as you say.
Okay, I went out and checked. (Why is this easier when flying than when typing?)
My setup: HX with V6 software (latest), G420W, Trio Pro with GPSS/GPSV, but I suspect HXr and HS and other GPSS autopilots will all be the same.

Starting Point: G420W has an LPV gps approach loaded and activated. GRT has the 420 gps selected as the nav source.
Case 1: If using the gps to navigate along a NoPT route to final, set GRT to GNAV; Set "GPSV Arm" anytime, before or after final course intercept. GRT goes from GNAV to ENAV at intercept if set before, otherwise when you select ARM. (Set it before glide slope intercept or the autopilot will dive the airplane to try to catch it!)
Case 2: If being vectored to final, set GRT autopilot control to "Heading". Use heading bug to set in vectors. Select "GPSV ARM" PRIOR to final course intercept. GRT will automatically go from Heading to Enav at intercept
Case 3: If using gps to navigate to a holding pattern course reversal: Select "GNAV" on GRT. Do NOT select "GPSV ARM" until inbound for the approach. If you need more than the course reversal, e.g., you need to actually hold, do not select ARM until inbound the last time (and you will need to push OBS on the 420W to keep it from sequencing during the hold).
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  #7  
Old 03-08-2014, 05:15 PM
jjhoneck jjhoneck is offline
 
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Location: PORT ARANSAS
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Quote:
Originally Posted by Radomir View Post
Once you're inbound on final approach course (but not sooner), push buttons by going to "ARM" menu and then select "GPSV" option.. that should take care of the vertical part. Keep Lat AP in "GNAV" mode.

http://www.grtavionics.com/Using%20A...20Director.pdf

Page 1 shows those menu options.
Thanks for the link -- this is exactly what I've been looking for with our new HXr installation.
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  #8  
Old 03-09-2014, 05:08 PM
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Arlen Arlen is offline
 
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...a big Thank You to David Maib for taking the time today to sit with me in his beautiful -10 to talk Hxr and 430W....and other RV goodness.



.
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  #9  
Old 03-08-2014, 12:02 PM
BobTurner BobTurner is offline
 
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As Dave said, go see him. It is hard to do this without sitting in front of the equipment. That being said....
I think pushing the direct to (iaf) is a mistake. That will delete the 430 flight plan and replace it with direct iaf. Push the flight plan button, highlight the iaf (which is there because you already loaded and activated the approach), then push direct. This will leave the whole flight plan intact.
After this, don't forget to go to the HXr autopilot menu and highlight GPSV arm. You do not have to wait until you are on the final approach course. Depending on the option you set up in the software controls, a button may appear asking you to activate the approach mode.

I always remind people that autopilots are great, but they require twice as much training time: first to be able to fly without it, and then to be able to fly with it.

Last edited by BobTurner : 03-08-2014 at 12:06 PM.
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  #10  
Old 03-08-2014, 12:09 PM
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Arlen Arlen is offline
 
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Quote:
Originally Posted by BobTurner View Post
I always remind people that autopilots are great, but they require twice as much training time: first to be able to fly without it, and then to be able to fly with it.
Definitely, Bob. I spent the first 8 hours of flying the -6 without turning the autopilot on. Now, I'm in the learn-the-autopilot mode. When I fly, I typically fly some by hand and some by A/P. I'll use the A/P for approaches once I get pretty confident in my understanding of it.

I've flown a few apps by hand in the -6 now..
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