Hello.
I'm having trouble with ILS using TDS GTNXi PRO for MSFS 2024.
I'll try to provide as much information as possible so we can find a solution together.
MSFS 2024 v.1.7.16.0
TDS Aviation Trainer version 3.10.3.0
GTNXi PC Trainer version 20.42.2.0
Executable version 1.3.1.3
Gauge 3.0.4
Pro Upgrade: included
Aircraft: Black Square A36 Bonanza PRO 0.1.1a (last version)
Flight charts: Navigraph full, AIRAC Cycle 2603 rev.3 with TDS SIM SOFTWARE updated via Navigraph Hub
I'm a doctor, and also a professional pilot, and I have a lot of experience with IFR flights.
I often use MSFS and TDS GTNXi PRO for training.
The TDS GTNXi PRO performs the GPS flight plan very well, except when it comes time to execute ILS procedure for the selected RNW, loaded and activated.
The TDS recognizes the RNW ILS frequency in the active NAV window, even displaying its correct identification, but in the moment the VLOC is activated, the IFR navigation is completely disabled (the red NAV flag appears on the artificial horizon).
Since the TDS takes over all IFR navigation and controls, there is no way to activate an alternative NAV 2 to perform the landing, which needs to be aborted.
For your information, the TDS performs RNAV landing procedures without any problem, this difficulty its restricted to the ILS.
As a test, I installed the PMS50 GTN750 on this same aircraft, and this system performed the same ILS procedures flawlessly.
I verified this problem at many airports in Brazil (SBGR, SBSP, SBKP, SBGF, SBGL etc.)
Any solution?
Thanks
We are sorry to hear of the issues, we are here to help.
When the TDS GTNXi Pro is in VLOC mode, the autopilot, nav receiver and thus ILS are all in MSFS control, it is not us
Can you please provide us with screenshots of the issue so we can look it over internally. Please specify just one airport/procedure/runway and we will use only that procedure for testing.
Not to worry, we will do our best to assist you in finding a solution.
Thank you for the super-fast response.
I'd very much like to continue using TDS, but, let's face it, it becomes of little use if it's not possible to complete the flight without a functional ILS.
I understand, from reading other posts, that once VLOC is activated, ILS becomes a task for MSFS, but I tested it with the PMS50 GTN750 on this same aircraft, same airport, same RNW, and same approach, and the ILS worked flawlessly.
This indicates that, in other NAV/GPS system, the ILS works very well (it's not an intrinsic problem of MSFS), and also suggests that TDS is not communicating properly with FS when ILS is activated.
I reiterate that the frequency and identification of the ILS is recognized by TDS, is in the active window, and as soon as VLOC is activated, the red NAV flag immediately appears on the artificial horizon, which disables instrument navigation.
I suggest you test the problem in the ILS procedures of RWY 17R at SBSP.
Please let me know wich screenshots you need. Let's find a solution together.
Comparing the TDS GTNXi Pro with other software is not a fair assessment, as the bug could be aircraft related (to the TDS GTNXi Pro config, simulator related), so let's concentrate on the bug as well as other issues. As we have stated in our previous message, we are committed to doing our very best to assist you.
Please provide us with screenshots:
"is in the active window, and as soon as VLOC is activated, the red NAV flag immediately appears on the artificial horizon, which disables instrument navigation."
We need to see the entire panel, as well as the TDS GTNXi Pro/autopilot.
I tested it with my sim. I don't have BS Boanza, but I tested with their Caravan Pro.
All works good. You set your NAV frq in TDS to ILS frq (I tested at EPSY, ILS 108.1 with 012* course). First flying in GPS mode. Then I switch to VLOC - HSI correctly displayed ILS reading.
Maybe some bug in Bonanza?
I tested it with my sim. I don't have BS Boanza, but I tested with their Caravan Pro.
All works good. You set your NAV frq in TDS to ILS frq (I tested at EPSY, ILS 108.1 with 012* course). First flying in GPS mode. Then I switch to VLOC - HSI correctly displayed ILS reading.
Maybe some bug in Bonanza?
Paweł
Thank you for confirming this, Pawel, we shall see exactly when Valter will post the screenshots.
Hello.
Thank you all for your kind interest and testing.
Here are some screenshots indicating the issue.
The first image is an ILS approach at SBKP, RNW 15.
After activating the ILS X 15 approach vectors in TDS, the artificial horizon immediately showed the red NAV flag, alerting that the autopilot, despite the indications on the annunciator, was not active.
There was no capture of LOC and GS, and the landing was performed entirely manually.
The second and third images show the approach at SBSP, RNW 17R.
Similarly, after activating the ILS X 17R approach vectors in TDS, the artificial horizon immediately showed the red NAV flag, alerting that the autopilot, despite the indications on the annunciator, was not active.
There was also no capture of LOC and GS.
Any ideas?
Thank you.
03-31-2026, 11:25 AM (This post was last modified: 03-31-2026, 11:30 AM by adminOwner2.)
Hello,
We are looking into this, however from the initial find, in the screenshots provided, the TDS GTNXi frequency entered for NAV1 has been 109.30, while the SBKP RW 15 ILS frequency is: 110.30.
We suggest trying this: start a new flight on ground SBKP RW 15, with the TDS GTNXi, do not enter any flight plan. Enter frequency 110.30, then switch to VLOC mode, show us a new screenshot.
Thank you for your response, but please look carefully at the text and screenshots.
Just for your information, these are two procedures at different airports, to demonstrate that the problem is not related to a specific location or frequency.
The first image (green background on the panel, night landing) corresponds to SBKP, RNW 15 approach, and the ILS frequency is correct: 110.30.
The next two images correspond to the ILS of SBSP, RNW 17R (natural panel color, daytime landing) approach, and the frequency is also correct: 109.30.
Sure, as you suggested, I'll take some screenshots at the SBKP 15 runway head, without any flight plan, TDS GTNXi with 110.30 in VLOC mode.
Thank you
Hello.
Thank you all for your interest in this problem.
From what I observed in this post and some research, as you initially stated, the problem really seems to be inherently related to my system, and not TDS.
Therefore, based on various information, I did three actions to try to solve the issue:
a) repair MSFS 2024 through the system menu (Settings -> Apps -> Installed Apps -> Microsoft Flight Simulator 2024 -> Advanced options -> Repair)
b) delete the rolling cache file (C:\Users\XXXXX\AppData\Local\Packages\Microsoft.Limitless_8wekyb3d8bbwe\LocalCache\rollingcache.ccc)
c) remove and reinstall all Navigraph files, using the Navigraph Hub utility, both in the "installed in MSFS2024" tab and in the "installed outside the simulator" tab (referring to TDS SIM).
After restarting the computer,the ILS worked normally. This indicates that the ILS issue was potentially related to corrupted files, and not the TDS.
In fact, according to information in several MSFS-specialized forums, this is particularly true for Navigraph.
For now, everything is back to normal, and I'm observing the behavior from now on.
Once again, thank you very much for everyone's kind attention.
