Originally Posted by infrequentflyer789
Originally Posted by auv-ee
It seems that an alternative air speed measurement is needed to augment the pitot tubes, something that would be affected differently by environmental effects and other failure modes.
Already exists - BUSS. Not fitted on AF airbuses.
The description of BUSS does not make it sound very appealing. I was thinking of something that would be a precise speed measurement, as valid as the pitots, a few of which would provide more inputs to the voting logic and the Kalman filter.
Originally Posted by bearfoil
Redundancy is a siren on the rocks when one is up against common fault.
The idea is to add a speed sensor based on different physics that would not be subject to the same failure modes as pitots. I agree about "parallel" redundancy, like multiple pitots, where a common fault is possible, or the case of "series" redundancy where the pre-existing failure of a backup is not evident until the primary fails (double pressure seals come to mind).