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VNAV function (Read 1014 times)
Jun 29th, 2018 at 11:04am

james porter   Offline
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I have checked the previous posts and seen several videos of the use of the VNAV function when selecting the Direct TO a selected runway. When using the Skyview only (no other source) the display shows a magenta line from the runway threshold to approximately the FAF.
I attempted two intercepts using the track and ALT hold and then selecting Direct To the selected runway. On the first attempt I attempted to intercept the extended runway center line outside of the magenta course line. The autopilot flew through the center line and did not switch or capture the VNAV or change the aircrafts direction.
On the second attempt I intercepted the magenta line and the autopilot changed to VNAV and tracked the magenta line as well as descending along the prescribed glide-path.
My question is are you required to intercept the magenta course line?
Is there a way to extend this runway center line and have the autopilot intercept it?
Since this was my first attempt I obviously may have not had the autopilot properly set up on my first attempt.
Thanks.
« Last Edit: Jun 29th, 2018 at 3:52pm by james porter »  
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Reply #1 - Jun 29th, 2018 at 6:22pm

Dynon Avionics   Offline
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So for the VNAV function to activate, it needs to be armed. So if you're not seeing it on the AP top bar status area after the arrow (ie ALT XXXX>VNAV, it's not armed). The other is that you need to approach that glidepath from below for the AP to sequence. On the roll axis, similarly, NAV needs to be armed, so you need to see either HDG>NAV or TRK>NAV in the status area. Once you intercept the course, it should transition.
 

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Reply #2 - Jun 30th, 2018 at 6:25am

james porter   Offline
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Thanks for the reply.  I was aware of that but don't recall if those indications were present when I made my first attempt.
Still I have my original question.
Can you accomplish all of that when attempting to intercept the course outside the magenta course line?
Thanks.
 
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Reply #3 - Jul 3rd, 2018 at 11:08am

Dynon Avionics   Offline
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For course guidance purposes, that extended centerline leg extends invisibly forever. In other words, if you aim angularly towards an extension of that leg, the needle will center, and as long as you're armed in HDG>NAV or TRK>NAV modes, you'll transition onto the lateral guidance in NAV mode when you get close.
 

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Reply #4 - Jul 3rd, 2018 at 5:31pm

james porter   Offline
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Thanks again for the reply.

 
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Reply #5 - Jul 4th, 2018 at 6:12pm

Jrskygod   Offline
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If I'm reading this right are you trying to do VNAV without the proper IFR navigator? If so the autopilot wont have the steering information available to utilize the VNAV function. Skyview itself wont do what I think you are trying to do without a certified WAAS navigator.
 
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Reply #6 - Jul 5th, 2018 at 5:43pm

Dynon Avionics   Offline
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We actually now have a very basic VNAV function that will set you up on an X degree glideslope to a runway. It is NOT suitable as an IFR approach aid.
 

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Reply #7 - Jul 5th, 2018 at 10:40pm

wmince   Offline
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Dynon Avionics wrote on Jul 5th, 2018 at 5:43pm:
We actually now have a very basic VNAV function that will set you up on an X degree glideslope to a runway. It is NOT suitable as an IFR approach aid.

In Dynons opinion, how well does the Garmin GTN 625 function with Skyview? Specifically, LPV approaches and missed approach functionality?
« Last Edit: Jul 5th, 2018 at 10:40pm by wmince »  
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Reply #8 - Jul 6th, 2018 at 4:57pm

Dynon Avionics   Offline
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Very well! At least we think so. You can fly LPV approaches under AP-control.
 

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Reply #9 - Jul 6th, 2018 at 7:29pm

wmince   Offline
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Dynon Avionics wrote on Jul 6th, 2018 at 4:57pm:
Very well! At least we think so. You can fly LPV approaches under AP-control.

Thank you for the prompt answer.
 
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Reply #10 - Jul 15th, 2018 at 3:28pm

james porter   Offline
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Again, thanks for the response.
I flew the VNAV procedure several days ago and everything went according to plan.  I found that the auto pilot elevator response was very active and got a pitch slip message more than once.

 
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Reply #11 - Sep 29th, 2018 at 2:05pm

wmince   Offline
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wmince wrote on Jul 5th, 2018 at 10:40pm:
[quote author=dynon_support link=1530295459/6#6 date=1530837829]We actually now have a very basic VNAV function that will set you up on an X degree glideslope to a runway. It is NOT suitable as an IFR approach aid.
. . . . .
 
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