The standby battery is charged by what bus and activates if power is lost from which bus?

The standby battery is charged by what bus and activates if power is lost from which bus?

• A. Charged from left mission bus; activates if power lost from right mission bus
• B. Charged from right mission bus; activates if power lost from left mission bus
• C. Charged from left mission bus; activates if power lost from left mission bus
• D. Charged from right mission bus; activates if power lost from right mission bus

Answer: (A)

Standby power is a dedicated source to keep essential flight instruments alive when the main electrical system loses power. In this arrangement, the standby battery is kept charged from the left mission bus during normal operation, so it has a full charge ready if needed. It is wired to automatically connect to the essential bus and provide power when the right mission bus loses power. This setup ensures critical systems remain available even if one mission bus fails, by having the battery charged from the left side and take over when the right side goes dark.

Standby power is a dedicated source to keep essential flight instruments alive when the main electrical system loses power. In this arrangement, the standby battery is kept charged from the left mission bus during normal operation, so it has a full charge ready if needed. It is wired to automatically connect to the essential bus and provide power when the right mission bus loses power. This setup ensures critical systems remain available even if one mission bus fails, by having the battery charged from the left side and take over when the right side goes dark.