[mkschreder]

I want to configure failsafe to activate a servo upon signal loss, but only if armed and in flight. Is there a built in way to configure something like this or do I need to modify the source code?

[f5soh]

Hi, welcome

Assign a Accessory input to the servo output (Vehicle tab)
Like here for a buzzer:
https://librepilot.atlassian.net/wiki/display/LPDOC/Adding+a+buzzer+to+Multirotor+frame

Go to UAVOBrowser tab and look at ManualControlSettings > Failsafe settings

And set the Accessory value when failsafe occurs.
Be sure the failsafe is working fine, some receiver still sending a valid signal and flight controller cannot know the signal is lost.

Also consider you can got a brief failsafe and regain control while the parachute is released....

[mkschreder]

Thanks!