Failure of an IAC automatically switches the MFDs and controls to the other IAC. No pilot action is required.

• A. True
• B. False
• C. Only if IAC1 fails
• D. Not applicable

Answer: (A)

Dual IACs are designed with automatic failover to keep the cockpit functioning even if one unit fails. Each IAC communicates over a shared data bus and monitors the other with a heartbeat signal. When one IAC fails, the remaining unit takes over the processing and routing for the MFDs and flight controls without any pilot input. The handover is intended to be seamless so displays stay current and controls remain responsive, preserving situational awareness and control. You would only need to intervene if the automatic switchover didn’t occur or both IACs were affected.