plane icon Welcome to Microsoft Flight Simulator’s SDK Q&A Platform!

You have questions regarding the SDK? DevMode Tools? SimConnect? You would like to submit an idea for future improvements, seek help or exchange knowledge? You’re in the right place.

Please take a moment to read the platform’s guidelines before you get started!


Ironpot avatar image
Ironpot asked Ironpot commented

Issue creating ILS in DEV mode

Since WU8 the default ILS for YMLT on RW32 (Launceston Tasmania) has been off to the left of the taxiway with a touchdown at the check-in counter of the terminal...

I have added an ILS override directly into the XML and that works however I want to use the DEV mode functionality. So I removed the lines I added to the XML and set the deleteAllILSs to TRUE

Using v1.27.14.0

I find I can add the ILS but NEVER save it. Specifically I have the following issues:

  1. Frequency always defaults to a rounded value - I try to enter 109.500 but the display is 109
  2. I can never save
    • I always receive an error stating the ILS frequency needs to be between 108 and 117.95
    • Invalid child object

Refer to the 2 images



This is the actual information I enter for the ILS


This is the default ILS and as can be seen it's some way off to the left


1660528502493.jpeg (66.3 KiB)
1660528526995.jpeg (157.0 KiB)
1660528539952.jpeg (54.5 KiB)
1660528552712.jpeg (207.4 KiB)
10 |10000

Up to 5 attachments (including images) can be used with a maximum of 4.8 MiB each and 23.8 MiB total.

Boris_ avatar image
Boris_ answered Ironpot commented

Hello @Ironpot ,
The frequency to enter is in Hz, as indicated in the input.
You should put the frequency in Hz (109500000) as indicated in the input and the documentation





1660551339887.png (7.4 KiB)
1660551388626.png (25.5 KiB)
10 |10000

Up to 5 attachments (including images) can be used with a maximum of 4.8 MiB each and 23.8 MiB total.

Ironpot avatar image Ironpot commented ·

Hi @Boris_

Seems there’s two sets of documentation! Anyway yes agreed. What of the end statement missing in the write back to xml. Can you check? And can you advise whoever that YMLT is off with it’s default ILS?

0 Likes 0 ·
Boris_ avatar image Boris_ ♦♦ Ironpot commented ·


Because we can do manual edit via xml or the scenery editor, yes, they are 2 type of documentation for the runway properties.

The xml documentation for runways is here :
You can see in the description that we are talking about xml

The documentation for the scenery editor is here :

We can cleary see that we are talking about the scenery editor ;)

I suggest you edit your ILS settings via the scenery editor only.
The <DME> and <Glidescope> should be inside <ILS></ILS>



About the fact that YMLT is off with it’s default ILS, you should open an issue on our zendesk as this is not devsupport related


0 Likes 0 ·
1660555056080.png (12.3 KiB)
1660556307314.png (11.5 KiB)
Ironpot avatar image Ironpot Boris_ ♦♦ commented ·
Thanks @Boris_. Will do and thanks for the answer
1 Like 1 ·
Ironpot avatar image
Ironpot answered Ironpot edited

After spending all day :) on this I worked it out sort of....

Frequency is entered without an actual decimal point thus:


To be fair - the SDK documentation does not elude to this:


I cheated a bit by putting the following into the XML between the Runway section and manually inserting the end="PRIMARY" component. It seems that's the bit that causes the error and doesn't get written into the XML from DEV.

<Ils lat="-41.54494457932187" lon="147.21089350552236" alt="166.51136076077819" end="PRIMARY" range="50016.79303200000140" ident="ILT" magvar="346.000000" heading="313.00000000000000" frequency="109.50000000000000" width="5.000000" name="ILS RW32L" backCourse="TRUE">

<Dme lat="-41.54385200000000" lon="147.21328199999999" alt="166.46517600000001" range="50016.79303200000140"/>

<GlideSlope lat="-41.54408831503709" lon="147.21063463847295" alt="-47.04086100589484" pitch="3.000000" range="50016.79303200000140"/>


Once I did this, the errors went away and the values were visible in DEV. I also had to set the DeleteAllILS = "FALSE" to be able to actually see and use the ILS


I would still like it confirmed by someone if possible. Thanks.

1660549203062.png (6.0 KiB)
1660549715964.jpeg (537.6 KiB)
1660549941968.png (4.7 KiB)
10 |10000

Up to 5 attachments (including images) can be used with a maximum of 4.8 MiB each and 23.8 MiB total.

Write an Answer

Hint: Notify or tag a user in this post by typing @username.

Up to 5 attachments (including images) can be used with a maximum of 19.1 MiB each and 23.8 MiB total.