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.