Which FMGC is designated as master during a dual-channel approach with AP1 and AP2?

Which FMGC is designated as master during a dual-channel approach with AP1 and AP2?

• A. FMGC 2
• B. FMGC 1
• C. FMGC 1 or FMGC 2
• D. Neither FMGC

Answer: (B)

In a dual-channel setup, the two FMGCs operate in a master/slave relationship to ensure continuous and reliable flight guidance. The master FMGC performs the primary navigation and flight management calculations and provides the authoritative guidance data that the flight control system uses during the approach. The other FMGC mirrors that data and monitors for discrepancies, ready to take over if the master should fail. By convention, the master is FMGC 1, so AP1 relies on the guidance from the master while AP2 serves as the secondary channel. If FMGC 1 were to fail, FMGC 2 automatically becomes the master to maintain guidance and allow continued control with AP2.

In a dual-channel setup, the two FMGCs operate in a master/slave relationship to ensure continuous and reliable flight guidance. The master FMGC performs the primary navigation and flight management calculations and provides the authoritative guidance data that the flight control system uses during the approach. The other FMGC mirrors that data and monitors for discrepancies, ready to take over if the master should fail. By convention, the master is FMGC 1, so AP1 relies on the guidance from the master while AP2 serves as the secondary channel. If FMGC 1 were to fail, FMGC 2 automatically becomes the master to maintain guidance and allow continued control with AP2.