Disable FLTA on IFD540?
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=1552
Printed Date: 29 Apr 2025 at 9:34pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: Disable FLTA on IFD540?
Posted By: marktrav
Subject: Disable FLTA on IFD540?
Date Posted: 06 Jul 2018 at 12:43pm
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I frequently fly into fields that are not in the IFD540 database (for instance, 30GA) and when I fly in the Bonanzas to Oshkosh trip we frequently fly low due to clouds cover the Oshkosh area. I am sick-to-death of hearing "Terrain ahead pull up pull up" over and over in these situations. It's not useful, and in certain situations, it's very distracting, which can be dangerous in and of itself. How can I turn this off? I DO like the callouts at 500 feet on final and I LOVE the bell at the TOD on an approach. |
Replies:
Posted By: AviSteve
Date Posted: 06 Jul 2018 at 2:38pm
The IFDs have a feature designed specifically for this purpose. See "Designating a user waypoint as an airfield" in the Pilot's Guide. In my copy of the IFD540 PG it's on 2-49. I'll be the first to admit that it's a little hokey, but it gets the job done. Maybe in a future version it will get a little less hokey... ------------- Steve Lindsley Avidyne Engineering |
marktrav wrote:Posted By: marktrav
Date Posted: 06 Jul 2018 at 3:07pm
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Steve, thanks! That's helpful for individual airports. What about all of the wind turbines and obstacles between Rockford, IL and Oshkosh, WI? That's where it really distracts me. I'm looking at my formation lead and never in the cockpit and I keep hearing (and have to ignore) "obstacle ahead, warning, obstacle ahead, warning". As long as I'm asking... is there a way to get private airports in the IFD databases? Or is that just not supplied by Jeppesen? I can get them on ForeFlight.
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Posted By: AviSteve
Date Posted: 06 Jul 2018 at 3:15pm
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You can't disable the alerts to the obstacles. That's the whole reason for the function. You might know they're there, but the IFD doesn't know that you know... I've tried several times to get Jeppesen to just include all private airports, but have been unsuccessful so far. They are pretty responsive, however, to individual requests as long as they have the source data. Let me know what you would like to be added and I'll see what I can do. ------------- Steve Lindsley Avidyne Engineering |
Posted By: Ibraham
Date Posted: 06 Jul 2018 at 5:14pm
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FLTA alerts are inhibited if any of the following conditions are met: FLTA is manually turned off via the pilot-accessible “User Options” LSK on the “SETUP” tab of the AUX page (generates a “FLTA OFF” CAS Advisory message); The ownship position is inside the rectangular (or circular, in the case of no known runway orientation) FLTA Inhibitzone depicted on the 2D map (generates a “FLTA INHIBITED” CAS Advisory message); The projected ground impact point along the current ground track intersects the terrain inside that FLTA Inhibit rectangle/circle (generates a “FLTA INHIBITED” CAS Advisory message); The Reduced Terrain Clearance (RTC) violation is projected to happen inside that FLTA Inhibit rectangle/circle (generates a “FLTA INHIBITED” CAS Advisory message).
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Posted By: LANCE
Date Posted: 06 Jul 2018 at 11:14pm
TS36 Silver Wings in Fredericksburg TX
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Posted By: Ibraham
Date Posted: 07 Jul 2018 at 11:51am
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FLTA can be turned off as per the IFD540 10.2.1 Pilot Guide page 3-34 (the text below is copied from that page) FLTA alerts are inhibited if any of the following conditions are met: • FLTA is manually turned off via the pilot-accessible “User Options” LSK on the “SETUP” tab of the AUX page (generates a “FLTA OFF” CAS Advisory message); • The ownship position is inside the rectangular (or circular, in the case of no known runway orientation) FLTA Inhibit zone depicted on the 2D map (generates a “FLTA INHIBITED” CAS Advisory message); • The projected ground impact point along the current ground track intersects the terrain inside that FLTA Inhibit rectangle/circle (generates a “FLTA INHIBITED” CAS Advisory message); • The Reduced Terrain Clearance (RTC) violation is projected to happen inside that FLTA Inhibit rectangle/circle (generates a “FLTA INHIBITED” CAS Advisory message). |
Posted By: nrproces
Date Posted: 07 Jul 2018 at 1:23pm
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Cabin Creek Landing 97MT Thanks ------------- Sauce |
Posted By: brou0040
Date Posted: 07 Jul 2018 at 5:25pm
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You can also install a switch to more easily enable and disable FTLA. I had it installed for me when I upgraded my audio panel and love the dedicated switch. I often get warnings while flying through mountain passes and some mountain airports while approaching the airport, but still about 3 miles out. When I know the terrain and I'm looking right at it, the aural warning is nothing but distraction so I can now just flip the switch and quickly turn it off. I have a step in my pre-flight to ensure the switch has FTLA enabled in case I forget to turn it back on after I land.
From the manual: "An alternative means to inhibit the TAWS FLTA and PDA functions is via an external switch that can be optionally installed somewhere in the cockpit."
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Posted By: Bob H
Date Posted: 08 Jul 2018 at 3:38pm
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I fly an amphib, so I get the terrain & obstacle warnings all the time. For lakes I land on regularly, I designate them as airport waypoints. For other lakes, I just turn the volume down in the AUX-AUDIO Tab. You can still hear it faintly in the background, but it is not distracting. I considered a switch, but decided I could easily put that in later. I could also connect it to an unused switched input on my audio panel. But given that I can still hear it without it being distracting, I'm good for now. ------------- Bob |
Posted By: AviSteve
Date Posted: 17 Jul 2018 at 11:21am
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97MT and TS36 will be included in cycle 1809. ------------- Steve Lindsley Avidyne Engineering |
Posted By: PA20Pacer
Date Posted: 18 Jul 2018 at 8:39am
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Wow, Steve. You must have some stroke with Jeppesen! How about: 11LL Thacker Airport, Chenoa, IL Regards, Bob ------------- Bob Siegfried, II Brookeridge Airpark (LL22) Downers Grove, IL |
Posted By: nrproces
Date Posted: 18 Jul 2018 at 9:57am
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Thanks for putting my home airport in the database. ------------- Sauce |
Posted By: AviSteve
Date Posted: 20 Jul 2018 at 7:06pm
11LL will also be in for 1809 :) ------------- Steve Lindsley Avidyne Engineering |