I hadn't updated navdata for a couple of months, so I've only just come across this issue. With cycle 2509 released, I went into the OIS to update it (I already had NAVIGRAPH data selected and linked). I did this with the aircraft on external power, no engines running. I downloaded the latest revision (2509r1) and that showed up correctly in the OIS with a green success banner and an updated revision nymber. However the FMS is still on the old revision. I tried powering off the aircraft completely then reapplying battery and external power. That didn't load the new database. I had to go back to the main MSFS menu then reload the A350 to get the new revision loaded.

• The FAQ says downloading a new navdata revision wipes the database, but it doesn't indicate that in the OIS and the FMS still has the old data.
• The FAQ says switching from NAVIGRAPH to SIM DEFAULT would wipe the database, but it doesn't indicate that in the OIS and the FMS still has the old data.
• The FAQ doesn't mention having to reload the sim to get the new database loaded in the FMGS.

So how is this supposed to work? Is a reload now a required step? If so that's not great, as it takes up a lot of time in MSFS. The PMDG 777 EFB updates the navdata loaded in the FMS so there's no need to reload the sim. So it is possible.

An offline method of updating navdata would be much faster and more convenient unless this can be fixed. Managing this via the Navigraph Hub would be a way to do that.

Finally, a suggestion. The sim doesn't keep a back up navdata revision (unlike the real aircraft). That would be a nice feature to implement so you could easily revert to the previous revision in the FMS in case there's a problem with the latest data.

Kevin

On 9/16/2025 at 5:27 PM, kevinh said:

I hadn't updated navdata for a couple of months, so I've only just come across this issue. With cycle 2509 released, I went into the OIS to update it (I already had NAVIGRAPH data selected and linked). I did this with the aircraft on external power, no engines running. I downloaded the latest revision (2509r1) and that showed up correctly in the OIS with a green success banner and an updated revision nymber. However the FMS is still on the old revision. I tried powering off the aircraft completely then reapplying battery and external power. That didn't load the new database. I had to go back to the main MSFS menu then reload the A350 to get the new revision loaded.

• The FAQ says downloading a new navdata revision wipes the database, but it doesn't indicate that in the OIS and the FMS still has the old data.

• The FAQ says switching from NAVIGRAPH to SIM DEFAULT would wipe the database, but it doesn't indicate that in the OIS and the FMS still has the old data.

• The FAQ doesn't mention having to reload the sim to get the new database loaded in the FMGS.

So how is this supposed to work? Is a reload now a required step? If so that's not great, as it takes up a lot of time in MSFS. The PMDG 777 EFB updates the navdata loaded in the FMS so there's no need to reload the sim. So it is possible.

An offline method of updating navdata would be much faster and more convenient unless this can be fixed. Managing this via the Navigraph Hub would be a way to do that.

Finally, a suggestion. The sim doesn't keep a back up navdata revision (unlike the real aircraft). That would be a nice feature to implement so you could easily revert to the previous revision in the FMS in case there's a problem with the latest data.

Kevin

I asked this last year and still no response. I have 1.2.6 installed, have downloaded the latest AIRAC in the OIS but the FMGC still will not update in the sim. You have to reload. Why can't this be done in the Navigraph Hub, would be much easier?

Edited yesterday at 01:20 PM1 day by kevinh

I usually just click somewhere in the MDCU after installing the update, usually a route page or ATC COM page, something that takes away from the INIT Page with the Data Cycle, and then I enter back into the INIT Page and the cycle is always updated. I've never had to reload the sim to refresh their navdata nor do I personally know anyone else that has yet to do so. I'll ask the team about keeping the prior data on-board and the feasibility of that as it could be helpful. Let me know if this helps