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Approaches requiring ILS DME |
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Jmack 
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Joined: 07 Aug 2018 Location: 08753 Status: Offline Points: 10 |
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 Topic: Approaches requiring ILS DMEPosted: 18 Apr 2020 at 4:09pm |
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Some approaches, such as the ILS LOC only approach to RWY 4R at KEWR, have VDP and Missed Approach points defined by the ILS DME (IEZA in this case). Is it possible with an IFD 540 and 440 to somehow display this DME?
John
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John
A36 |
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teeth6
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Joined: 10 Mar 2014 Status: Offline Points: 741 |
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Posted: 18 Apr 2020 at 6:53pm |
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It doesn't display the DME but you can still use the IFD to identify these points. Notice that although DOOIN is 6.2 DME, if you add the distances in the profile, the IFD at DOOIN will display 5.2 miles to Rwy 4. Likewise, when the IFD displays 1.6 you are at the VDP
Edited by teeth6 - 18 Apr 2020 at 6:57pm |
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Gring
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Joined: 30 Dec 2011 Location: Kingston, NY Status: Offline Points: 720 |
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Posted: 18 Apr 2020 at 8:40pm |
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There is a datablock for the NAV radio that has the GPS computed DME (legal substitute for DME).
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teeth6
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Posted: 18 Apr 2020 at 9:16pm |
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What is that data block called?
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dmtidler
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Posted: 18 Apr 2020 at 9:44pm |
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Per the IFD PG, the Decoded VLOC IDENT datablock referenced above will not display FMS direct distance to decoded localizer stations; only FMS direct distance to decoded VOR stations.
It appears that using the Designated Waypoint datablock will display the info requested in this thread. For the example ILS OR LOC 04R at KEWR, input IEZA into the Designated Waypoint datablock and the datablock will show FMS direct distance to the IEZA localizer DME station. I don’t know if this will work in every case; however, I spot checked this with a localizer DME station not co-located with its localizer antenna array (KORD ILS or LOC RWY 27L) in the IFD simulator. By the resulting FMS direct distances displayed, the IFD simulator identified the designated waypoint IIAC as the location of the IIAC DME station which is off the opposite end of the nearly 8000’ runway from the localizer antenna array. |
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Jmack
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Posted: 20 Apr 2020 at 5:45pm |
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Thanks dmtidler. I had never wondered about that data block and it is the perfect answer to my question and will be handy for some other uses as well.
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John
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