In the event of a dual air data fault, which sources should be consulted for fault isolation?

• A. ECAM/QRH and standby air data as cross-check.
• B. Captain’s notebook only.
• C. ATC guidance only.
• D. Passenger announcements and crew memory.

Answer: (A)

When a dual air data fault occurs, you need reliable, independent reference data to identify where the problem lies. The official ECAM/QRH provides the fault message and the exact steps to isolate and manage the fault. The standby air data system offers an independent set of instruments that aren’t fed by the same faulty sensors. Cross-checking the standby readings against the primary air data helps determine whether the issue is in the pitot/static/ADIRU path or in the data processing, guiding you to the correct reversion or backup procedure. Relying on captain’s notes, ATC guidance, or passenger information won’t give you the technical diagnostic capability needed for proper fault isolation.