When I switch on "Attitude control" with GeoLink aid on a separate channel, the helicopter slowly descends until I toggle the switch off. I have no collective control until I disable the setting via switch off.

I've tried increasing the collective given via settings in app, changing the height of the 'floor' from 5m to 10m and it still descends the same (no change in behavior).

The Geolink was/is calibrated (90 degrees at North heading) and shows as connected/fixed.

Has anyone else run into this?

Hello,

possibly you are engaging a wrong feature.

Altitude Control is not present, but there is Altitude Limit or Altitude Hold.
If it is Altitude Limit then you can verify easily on the bench if it is working properly.

Just after initialization and GeoLink signal acquisition you can engage the Altitude Limit feature. Right at the moment Collective Pitch must increase to a configured level.

If not, then possibly you have a Banks enabled and this feature is not enabled for selected bank.
Or you have other features engaged at the same time.

Which features are engaged is visible at the Diagnostic tab.

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Spirit System developer