AIR DATA

34-13-00-810-998-A [8]
Altitude or Airspeed Discrepancy between CAPT PFD - F/O PFD - STDBY/ISIS
34-13-00-810-998-B [8]
Altitude or Airspeed Disagree between the CAPT PFD or F/O PFD and Standby Horizon Indicator or ISIS (Aircraft with RVSM capability on the three ADIRUs)