How is a failed alternator detected and indicated to the pilot?

How is a failed alternator detected and indicated to the pilot?

• A. The system monitors ambient temperature and lights a warning if too hot
• B. The system detects abnormal voltage or current and triggers a warning light or annunciator
• C. Automatic engine shutdown occurs
• D. The cockpit displays a graphic of the alternator on the screen

Answer: (B)

The system detects an alternator problem by watching the electrical output and alerting the pilot when it falls outside normal limits. It continuously monitors the alternator’s output voltage and current; if voltage drops too low (or the current/charging capability is abnormal), a warning light or annunciator comes on. This immediate indication lets the pilot know the electrical system isn’t being supported by the alternator, so loads can be managed, and battery power or standby sources can be used if available. Other options don’t fit because ambient temperature monitoring isn’t how an alternator fault is signaled, and automatic engine shutdown doesn’t typically occur just from generator failure—the engine usually continues running and the pilot must handle power management. Displaying a graphic of the alternator isn’t the standard, immediate indication pilots rely on during a fault.

The system detects an alternator problem by watching the electrical output and alerting the pilot when it falls outside normal limits. It continuously monitors the alternator’s output voltage and current; if voltage drops too low (or the current/charging capability is abnormal), a warning light or annunciator comes on. This immediate indication lets the pilot know the electrical system isn’t being supported by the alternator, so loads can be managed, and battery power or standby sources can be used if available.

Other options don’t fit because ambient temperature monitoring isn’t how an alternator fault is signaled, and automatic engine shutdown doesn’t typically occur just from generator failure—the engine usually continues running and the pilot must handle power management. Displaying a graphic of the alternator isn’t the standard, immediate indication pilots rely on during a fault.