What is an example of a system like MCAS? The related question "Is it common for automated control systems to use non-redundant sensors?" does not ask about a specific example, nor are specific examples provided in the answer.

The criteria for my question:


Activates on its own, or always active.
No light/text indication of it being active.
No specific disable switch.
Relies on 1 sensor when 2+ exist.
The system is not disabled when the 2+ sensors disagree.


As you can see, these properties are modeled after what is known about MCAS.

This question isn't about the 737 in particular but about any commercial (fly-by-wire or not) airplane, so eventually the answers should specify the model, and if possible the justification of the design.
Irrespective of 737 MAX MCAS, I haven't seen similar decision relying on a single sensor on 777 or on 757.

Similarly I found nothing similar on Airbus 320, 330, 340, 350, or 380. On these Airbuses, 3 sensors are used for critical decisions, thus the faulty sensor is isolated by voting the data. If the 3 sensors are diverging (no 2 sensors giving similar data), the system goes into safe degraded mode, and the pilots are informed by automatic displayed message.