Visual Approaches - How to intercept final
Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=2516
Printed Date: 05 May 2025 at 11:36am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: Visual Approaches - How to intercept final
Posted By: guenter_ms
Subject: Visual Approaches - How to intercept final
Date Posted: 03 May 2023 at 3:14am
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Hi, I'm not sure about the best practice to intercept the final on a visual approach on my 540/440 combo. Assuming the last waypoint on my FPL is a VFR only airport and the waypoint is active and autopilot is in GPSS mode. Loading (and not activating) the Visual Approach to the active runway appends two new waypoints to the FPL: RW09 (final track) and repeats the destination airport marked as "destination". So far so good. Now: How to intercept the final? My questions:
As an FI I'm also familiar with the GTN 750 form Garmin. When loading an visual approach, a (configurable) 3 nm waypoint with altitude constraint according to the configured glide path is automatically included into the FPL, followed by the final track to the RWY. That is awesome! Is there any setup I missed to get that behavior as well? Thanks so much for answers to my questions. Maybe I didn't understood the correct how to's. I love the avidyne's but this point is really unclear for me. Take care!
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Replies:
Posted By: vas4avidyne
Date Posted: 04 May 2023 at 12:59am
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Unlike with an instrument approach where one can connect the rest of the flight plan to the approach, I haven't found any way to connect the visual approach to the rest of the flight plan. It seems to exist in isolation and only becomes active when one selects "Activate Visual". I haven't found a way to automatically activate the visual approach even if one intercepts the final approach path. I am not sure what the protocol level output is to the AP when it is active but for all intents and purposes, the AP tracks it just like it would an RNAV approach with vertical guidance (e.g. LPV). Vas
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Posted By: Ibraham
Date Posted: 04 May 2023 at 3:46pm
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Treat it like being vectored by ATC to intercept an ILS or final approach course on an RNAV approach. Autopilot in heading mode with NAV (or APR) armed (blue), it will fly the selected heading then intercepts the final approach course (visual approach course in this case) and automatically activates NAV.
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Posted By: guenter_ms
Date Posted: 11 May 2023 at 3:57am
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@avidyne: Can you comment? The answers to the 4 questions above seems to be: 1. not possible 2. not possible 3. not possible 4. unclear Thats not really satisfying. So I demand this FEATURE REQUEST When loading an visual approach, an additional waypoint is inserted at 3nm (customizable, e.g. from defined „final length") from RWY with an altitude constraint computed by distance form RWY and glidepath. This will solve all questions and makes it possible to append the VA to the plan, allowing to see all timings and distances in advance. That would be a great kick. Why should Garmin be so much better at this easy point? By the way: Loading a VTF approach does this since day one: Automatic waypoint to FAF is inserted. Why not on a VA? Best Guenter (Any one supporting this?)
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Posted By: paulr
Date Posted: 11 May 2023 at 11:33am
| I like that idea, Guenter. |
Posted By: guenter_ms
Date Posted: 24 Jul 2023 at 1:47am
| @avidyne: please comment. Thank you. |
Posted By: MysticCobra
Date Posted: 24 Jul 2023 at 8:17am
Avidyne forum post about the process: http://www.avidynelive.com/submit-your-suggestions_topic2483.html" rel="nofollow - http://www.avidynelive.com/submit-your-suggestions_topic2483.html Direct link to the form: https://www.avidyne.com/contact-us-2/" rel="nofollow - https://www.avidyne.com/contact-us-2/
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guenter_ms wrote:Posted By: AviSteve
Date Posted: 24 Jul 2023 at 9:45am
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Visual approaches are preceded by a discontinuity just like vectors-to-final for an instrument approach. The difference is that an instrument approach has a FAF (from the database) whereas a visual approach does not (because a visual approach doesn't come from the database). We tried various implementations of visual approaches during development, including the addition of a waypoint at "final length", but eventually settled on the current implementation because we thought that it worked best. I've created a feature request in our database for consideration. ------------- Steve Lindsley Avidyne Engineering |
Posted By: guenter_ms
Date Posted: 24 Jul 2023 at 10:48am
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Thank you Steve, as an FI I'm flying Avidyne and Garmin units and can strongly confirm the advantage of that feature. I understood you copied the request, so I don't need to do that again. Best Guenter
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Posted By: guenter_ms
Date Posted: 05 May 2025 at 4:12am
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@Avidyne, hello, can you please give a status of the feature request from AviSteve on July 2023 (see 2 posts above)? THANK YOU
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Posted By: AviSteve
Date Posted: 05 May 2025 at 11:09am
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That feature request still exists in our database for consideration at a future date. It was not included in 10.3.2.2. ------------- Steve Lindsley Avidyne Engineering |