If a NO TRANSFER light illuminates while fuel is still available in the AUX tank, what is the first step in the emergency procedures?

When the NO TRANSFER light illuminates while there is still fuel available in the AUX tank, the situation indicates that the fuel transfer system is not functioning as intended. The first step in the emergency procedures is to place the AUX TRANSFER switch to the OVERRIDE position. This action directly addresses the issue at hand by allowing manual control over the fuel transfer process, bypassing any automatic systems that may be malfunctioning.

Using the OVERRIDE option helps to ensure that the fuel from the AUX tank can continue to be transferred to the main system, which is crucial for maintaining engine operation and overall performance. It is a critical response that prioritizes immediate action to prevent fuel depletion from the primary tanks.

In contrast, checking the fuel levels in all tanks or turning off the standby fuel pump does not resolve the immediate problem of fuel transfer and may delay necessary actions to maintain the aircraft's operation. Resetting the fuel system might not address the current malfunction effectively and could lead to further complications. Thus, engaging the OVERRIDE option is the most logical and efficient step to take in this scenario.