TL

This issue has been encountered by several people (including myself) already. The last time as I played Arma3 on a fresh installed PC, without any active mods. The following helped to solve the issue (as stupid as it sounds): 1) Create a new loadout (content does not matter) on one of the Ahoyworld-servers. Not sure, if this step is necessary, but I performed it anyway. 2) Open the loadout-loading screen and click onto randomly selected entries, no matter if they are greyed out or not. 3) Load some of them and repeat step 2. The load-button should become active again for all the entries. The other option is to recreate your Arma3-profile from scratch. This was the solution, which was provided by some external forums, but since the above described steps worked for me, I have not tried the other options.

This obviously applies to other vehicles as well. A few days ago, one squad member reported that his previously used quad-bike suddenly disappered next to him. The issues with the helicopters seem to appear in the last days often and somehow affected only some pilots much more often than others. Obviously the take-off at the main base is critical: One helicopter disappeared after I entered it (before it was moved from its spawn-position to the helipads), the other disappeared after take-off from the helipads about 1 km outside of the main base and well... sad story... Yesterday some helicopters disappeared immediately after the pilots entered them at their respawn-locations at the main base as well. Maybe the despawn-script, which handles all the removal of the unused assets has an issue?

Far too much coffee...

Luetin09