CSS Software

Aircraft FAQ

Updating the AIRAC

Instructions on updating the FMC AIRAC cycle.

Updated Latest published version

The AIRAC is updated via Navigraph Hub, using a similar process to every other addon.

Afterwards, when you load the aircraft in the sim, go to the FMC IDENT page. The new AIRAC will be displayed at the bottom.

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Click on the LSK next to it to copy it to scratchpad, and then click on the LSK next to the current active AIRAC to replace it with the new one.

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Source: CSS Launcher User Manual, Rev. 5 — December 2025.