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Air Data and Inertial Reference System
Also from: ADIRS
Provides air data and inertial information to the EFIS, FMGC, and other users (fly-by-wire controls, engine management system, GPWS, transponder, SFCC). The system consists of:
- 3 separate ADIRUs
- one ADIRS panel on the overhead panel
- 2 GPS receivers
- sensors
- 8 ADMs
- switching for use in failures
- a MAG/TRUE pb sw for polar navigation
Air Data Modules
Connected to each of the pitot probes and static ports (the 2 standby static ports are connected to 1 ADM) and supply numerical data to the ADIRUs. Only the standby instruments (such as ISIS) get speed and altitude information directly from pneumatic inputs without processing by an ADM.
Failures
| NAV ADR 1(2) FAULT | - speed and altitude information lost from affected PFD - AIR DATA sw should be selected to failed side - failed ADR and GPWS must be switched off |
| NAV ATT DISCREPANCY | - different attitude displayed on captain's and first officer's PFDs - ATT HDG sw should be selected to failed side |