NAV ADR 1+2 FAULT

Climb passing FL150, VIDP–VABB. Both ADR 1 and ADR 2 have failed simultaneously — NAV ADR 1+2 FAULT ECAM caution triggers (Level 2, amber, single chime). AP 1+2 and A/THR disconnect. Flight controls revert to ALTERNATE LAW (PROT LOST). CAPT PFD and F/O PFD show conflicting or unreliable speed/altitude data. ADR 3 remains available — set it to the captain's side via AIR DATA SWTG.

Fly the aircraft in alternate law (MANEUVER WITH CARE, MAX 320 KT). Follow the ECAM: set AIR DATA SWTG to CAPT 3, then switch off both affected ADR pushbuttons. Crosscheck CAPT PFD, F/O PFD, and STBY ISIS to confirm ADR 3 is reliable. Switch off GPWS TERR and GPWS SYS if their fault lights come on. Review STATUS (AP 1+2, A/THR, ATC/XPDR, F/CTL PROT all INOP). Plan for FLAP 3 landing at VREF+10 KT.