devplane wrote:If I understood it correctly FBW just replaces mechanics with electronics and is not related to the sensor redundancy.
devplane wrote:I don't see the need for more redundancy. If the two sensors disagree, the protection can simply be turned off.
Starlionblue wrote:Two systems are not enough, because as stephanwintner says you want to implement a voting mechanism to remove the disagreeing system and keep the agreeing two. If you only have two systems and they don't agree, you have bigger problems than just the protections. Which set of sensor data to you trust for the autopilot to use? Which one do you use for manual flying?
The Airbus systems are way more complex than on/off. The concept of simply "turning off the protections" doesn't exist. Protections may deactivate due to a combination of malfunction, or an ECAM may tell the pilots to take an action that deactivates protections, but you would never turn them off proactively, so to speak.
Certainly, redundancy has been increasing over time. The A350, as an example, has three complete primary air data and inertial systems (ADIRS). If all those go down, there is a complete backup sensor suite (ISIS) and if you lose ISIS as well, engine air data from FADEC can be used.
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