Radio Navigation System
The aircraft has 2 of each navaid:
- VOR
- DME
- ILS
- ADF
The FMGCs can automatically tune the VORs, DMEs and ILSs for position updating and display purposes. Navaids are tuned manually via the RAD NAV page on the MCDUs. ILS 1 is displayed on PFD 1 and ND 2, ILS 2 is displayed on PFD 2 and ND 1. VOR, DME and ADF raw data is displayed on the DDRMI. The DDRMI compass card displays bearing supplied by ADIRU 1.
If both FMGCs fail, the backup tuning mode is through the RMPs.