Hi areobat,
Originally Posted by areobat
Are there parameters recorded on the FDR that could be used to determine retroactively that something like this occurred?
Certainly. This is the main reason why the BEA should be given all the time necessary to make a complete correlation between all the dataset recorded as, of course, some data could have been erroneously displayed (and recorded). Because all the flight parameters are related to each others, it would be possible to find, beyond any doubt, if anything was wrong with the airspeed before the system started to reject it.
In fact, in normal flight, all the sensors are already not displaying the same data by a certain margin due to their airframe location: an aircraft is almost never flying in a perfect symetrical attitude and this will cause some noticeable variation between the various sensed pressures. This is also the main reason why a clean probe system would very very unlikely be clogged (in flight) at exactly the same rate and at exactly the same time.