Why would my electric turn coordinator suddenly stop working? The electric Turn Coordinator in our Cardinal stopped working and we would like to understand the cause.
It simply doesn't move at all, it remain fix.
The red flag is not on, I have double checked the circuit breakers as well.
What could be the cause to that?
The motor for the gyro in a Turn Coordinator runs off fixed frequency ac power. For this there is a circuit board in the unit that includes a solid state static inverter to convert the airplane's 12 vdc to ac (110 v at 400 hZ IIRC).  When they just die like that it's usually because the inverter or something else on the circuit board has gone south.