# Simbrief - INVALID F\_PLN UPLINK

**URL:** <https://forum.navigraph.com/t/simbrief-invalid-f-pln-uplink/16453>\
**Category:** General\
**Created:** [July 25, 2024, 4:46pm UTC](https://forum.navigraph.com/t/simbrief-invalid-f-pln-uplink/16453 "2024-07-25T16:46:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![rich\_cooke](https://avatars.discourse-cdn.com/v4/letter/r/b77776/32.png) [@rich\_cooke](https://forum.navigraph.com/u/rich_cooke)\
**Post date:** [July 25, 2024, 4:46pm UTC](https://forum.navigraph.com/t/simbrief-invalid-f-pln-uplink/16453/1 "2024-07-25T16:46:45Z")

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Hi! My Simbrief has always worked with Prosin A320 without problems but today I got the above error message in the MCDU when trying to import the Flight Plan. I checked and my Simbrief Pilot Number is still entered in the Prosim systems configuration. I tried generating a different flight plan but got the same message.

I just updated to 2407 AIRAC. If I understand this correctly from 2407 Navigraph introduced a new navigation database for Prosim users and publicised this in your 2407 Newsletter. It seems the major change was to shift to DFD (=Digital Flight Data). I’m wondering (from reading the Prosim forum) if that shift seems to have caused incompatibility issues? Does anyone have any ideas how I can fix this?  
Thanks, Rich