A yellow UFCP 2 FAIL caution advisory on the CAS display means what?

• A. The rear UFCP is not communicating with IAC1 or IAC2, or the unit has failed
• B. The rear UFCP is not communicating with IAC1
• C. The rear UFCP has automatically switched to the REPEAT mode due to a power source failure
• D. The rear UFCP has lost power it's power source from the generator bus

Answer: (A)

A UFCP 2 FAIL on the CAS display points to a problem with the rear User Flight Control Panel. The system expects the rear UFCP to talk to its interface controllers (IAC1 and IAC2). If that communication is broken, the CAS shows a caution because the panel can’t send or receive the necessary data. It can also indicate the rear UFCP itself has failed internally, meaning the unit is not functioning at all.

That’s why this option is the best: it covers either a loss of communication with either IAC1 or IAC2, or a complete UFCP failure. The other possibilities describe power or mode changes that aren’t what this particular UFCP 2 warning signals, and they wouldn’t align with a direct communication/failure indication.