Beyond the three standard flap failures, which condition can the FCWU detect as an additional fault?

• A. If the flap motor or PDU overheats, it will trip the breaker.
• B. A hydraulic leak in the flap system.
• C. Loss of electrical power to the FCWU.
• D. A software fault in the FCU.

Answer: (A)

The FCWU is designed to monitor not only flap position but also electrical and thermal conditions in the flap system. If the flap motor or its power distribution unit overheats, the protection circuitry will trip the circuit breaker. That breaker trip is an electrical fault that the FCWU can detect and report as an additional fault beyond the standard three flap failures.

Hydraulic leaks are hydraulic faults and aren’t within the FCWU’s monitoring scope. Losing power to the FCWU would prevent it from detecting faults, and a software fault in the FCU would be an issue inside a different unit, not an FCWU-detected flap fault. So the overheated motor/PDU causing a breaker trip is the scenario the FCWU can identify as an extra fault.