What should be done if the battery is hot?

• A. Increase engine power
• B. BAT switch - OFF
• C. Check battery fluid levels
• D. Land immediately

Answer: (B)

Turning the BAT switch OFF is the appropriate action to take if the battery is hot. This step is crucial because overheating can indicate a battery failure or other electrical issues that might lead to hazardous conditions, such as a potential fire or further damage to the electrical systems. By switching off the battery, the electrical load is removed, which can help prevent worsened damage and ensure safety for the crew and aircraft.

While options such as increasing engine power or checking battery fluid levels might seem relevant in various scenarios, they do not directly address the immediate risk posed by a hot battery. Additionally, while landing immediately might seem like a prudent action, it isn't practical unless specific circumstances dictate such urgency, and it does not mitigate the immediate electrical issue at hand. Therefore, the best first response to ensure safety and manage the situation effectively is to turn off the battery.