If the airplane is equipped with a battery temperature light and the temperature continues to rise and reaches 150 degrees F, the crew should:

• A. Switch the battery OFF and monitor the battery temperature. It should decrease. If it doesn't, LAND.
• B. Continue normal operation.
• C. Increase the battery temperature to reset the sensor.
• D. Disconnect the battery.

Answer: (A)

When a battery temperature light comes on and the temperature climbs to 150°F, the immediate priority is to prevent a thermal event by removing electrical load from the battery. Switching the battery OFF stops charging and discharging, which helps the battery cool and reduces the risk of further heating or a potential fire. After turning it off, you monitor the temperature to see if it falls. If it does not decrease, you plan a landing as soon as practical to address the situation safely and complete the necessary shutdown procedures.

Continuing normal operation would keep feeding heat into an overheating battery and could lead to a more serious failure. Increasing the temperature to reset a sensor isn’t a remedy and could worsen the risk. Disconnecting the battery removes power from essential systems and isn’t the recommended immediate action in this scenario; the proper step is to shut the battery off and monitor, with a landing if the temperature doesn’t drop.