General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

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What causes the BACKUP GEN "OFF" light to illuminate?

The converter has failed
The backup generator is out of fuel
The main switch is ON
Maintenance is being performed

The correct answer is: The converter has failed

The illumination of the BACKUP GEN "OFF" light is primarily indicative that the backup generator is not operational due to a failure in the converter. This is a critical alert, as it informs the flight crew that the backup generator cannot supply power when the converter is malfunctioning, influencing the aircraft's ability to maintain essential power systems in the event of a primary power failure. In contrast, if the backup generator were out of fuel, it would typically not be indicated by the BACKUP GEN "OFF" light but rather by a separate fuel-related alert. The state of the main switch being ON suggests that the main power source is functioning and should not relate to the backup generator's off light. Additionally, maintenance activities could potentially trigger various alerts, but they wouldn't normally cause the BACKUP GEN "OFF" light to illuminate unless they relate directly to the functionality of the generator or associated systems undergoing checks in relation to its operation. Thus, a failure in the converter is the originating factor for the light’s activation.