For internal refueling, what action is not required with drop tanks?

When it comes to internal refueling with drop tanks, the action that is not required is to check the external precheck switch. This switch is typically involved in the process of monitoring and verifying the status of external fuel systems rather than the internal ones. During internal refueling operations, the focus is primarily on the internal fueling systems and their proper functions, which are separate from the checks typically performed for external tanks.

Engaging the internal pumps, disconnecting all external feeds, and performing a skip check are all necessary steps to ensure a safe and efficient refueling process. Engaging the internal pumps is critical to transfer fuel from the drop tanks, while disconnecting external feeds helps eliminate the risk of fuel transfer complications. The skip check confirms that the pumps are functioning correctly, which is essential to maintain the integrity of the fuel system during operations.