Top of Descent Question
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=726
Printed Date: 24 May 2024 at 10:55pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: Top of Descent Question
Posted By: brou0040
Subject: Top of Descent Question
Date Posted: 08 Jul 2015 at 12:11am
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I haven't been seeing the TOD marker or hearing the chime on recent flights. I believe it's because the 540 doesn't assume the last airport in the flight plan (no instrument approach) is a destination, meaning will have an altitude constraint of the airport elevation, therefore I don't meet the TOD requirement of a down-path waypoint with an altitude constraint below me. Is this correct? If so, I think it would be nice to default the last airport in the flight plan to be a destination with an altitude constraint of the airport elevation (or a user setting to say xxx feet above airport elevation since I like to get to the airport 1000 ft above at pattern altitude). The default destination altitude constraint would be overridden if the user specifies an altitude or an approach is selected. I think the work around is to set the altitude constraint to zero and it will come back with come back with some low altitude that is probably close enough. AviJake, do you know the calculation it spits back? I can't find an obvious answer. Thanks, Jayson
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Replies:
Posted By: jzawodn
Date Posted: 08 Jul 2015 at 12:31am
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Another option (feature request) would be to add a new approach to every airport: "Visual" That way you could plan an approach and the IFD could plan you to be at pattern altitude within, oh, 3 miles of the airport.
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Posted By: teeth6
Date Posted: 08 Jul 2015 at 6:47am
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Jayson, It may be a dumb question but are you setting the altitude and distance into the destination airport? I do not get the TOD either except when I set it in. If you put a distance before into the destination airport field, it will default to field elevation initially in the altitude area and you will have a TOD. |
Posted By: brou0040
Date Posted: 08 Jul 2015 at 10:01am
I wasn't, but after reading the manual, I tried that and that's when I realized that the flight plan doesn't assume you'll be landing at your destination. I'm going to start putting an altitude constraint at or before the airport to get the TOD, but it seems like it would be intuitive to default to landing at the destination. It's not a big issue, but it seems like changing the constraint for the exception would be better than having to tell it I actually want to land on every flight.
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teeth6 wrote:Posted By: DavidBunin
Date Posted: 12 Jul 2015 at 8:12pm
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I found that all you have to do is scroll to your destination in the flight plan, and click (or touch) the altitude constraint field (just the last bubble where you would dial in the altitude value of the constraint) and that's it. You don't have to select a distance, you don't have to select a constraint type, you don't even have to select the altitude. All of that stuff is filled in automatically the moment you click in the altitude block. So at least it's a one-touch solution. That said, I also completely agree that it's odd that the FMS doesn't assume that you will try to land at your destination. Maybe they can put that on the wish list for a future software. David |
Posted By: AviJake
Date Posted: 15 Jul 2015 at 3:23pm
Done. ------------- Steve Jacobson sjacobson@avidyne.com |
Posted By: brou0040
Date Posted: 15 Jul 2015 at 8:30pm
| I added a vertical constraint to todays destination and the tod worked great. I do not recall a chime, but i wasnt really listening for it either, i have the feature turned on. Thanks for adding the feature to the database. |
Posted By: n7ifr
Date Posted: 15 Jul 2015 at 9:59pm
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No chime with TOD as I recall either. What a great feature though. On destination Apt, all the 540 wants to know is how far out you want to be at 'pattern altitude'. If the Wish list assumed 4 miles (outer edge of class D, etc), this would be a great default starting point.
Tom |
Posted By: rolfe_tessem
Date Posted: 15 Jul 2015 at 10:07pm
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I'm not sure I understand the OP's problem as stated, but I get the chime on ILS approaches at GS intercept, which is exactly where it should be. This is very convenient as on my Bonanza (and I'm sure many other aircraft) this is essentially a gear down indication. I did have to have my shop double check the audio wiring to make this happen. If you are doing a straight 530 replacement, 99% of 530 installations didn't have audio out wired. The only ones that did were those with TAWS, which might have been some air carriers and such. So obviously, the audio out has to be wired to a non switched audio input on the audio panel for the chime to appear. Avidyne could do a better job of making this clear. Rolfe
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Posted By: Gring
Date Posted: 15 Jul 2015 at 10:19pm
| If you have the 530 TAWS audio pin wired, you do get a doorbell chime at the TOD marker. |
Posted By: rolfe_tessem
Date Posted: 15 Jul 2015 at 10:25pm
Exactly my point, but very few 530's had this wired, so you have to tell your installer to do it when you install the 540. Rolfe
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Posted By: DavidBunin
Date Posted: 16 Jul 2015 at 8:43am
?? Mine already knew. All I did was tap the altitude window in the flight plan. I didn't have to set any values at all. Just tapping in the bottom right field in the destination airport in the flight plan produced a constraint that was a thousand feet above the field elevation and five miles before. David |