Electric trim available with battery off/crashbar down
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You will find that the trims work when you are using external hardware, but not when the switches are moved in the cockpit. This is because I have no way of telling when someone is controlling the trim on their external hardware with a simple switch, or with a physical knob, which should never stop working in most aircraft.
You might find this post helpful to create a solution specific to your hardware.
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@Black-Square Thanks - I've implemented a condition within SPAD to prevent electric trims from working when there is no power to the bus, which is a good workaround :-)