Momentarily placing the BAT MSTR switch to ENGAGE connects the battery to which busses?

• A. Main bus 1
• B. Main bus 2
• C. Main bus 1 and Main bus 2
• D. Nonessential Bus

Answer: (C)

When you flip the Battery Master switch to ENGAGE, the battery is connected into the aircraft’s electrical distribution so power can flow to the main buses. The system is arranged with two Main Buses so the battery can feed both of them through the bus connections, energizing Main Bus 1 and Main Bus 2. This provides power to a wide set of circuits and preserves redundancy if one path or generator fails. The Nonessential Bus isn’t connected directly by this switch, so it won’t be energized just by ENGAGE.