What is the function of the in-transit light associated with an electrically operated fuel tank shutoff valve?

The function of the in-transit light associated with an electrically operated fuel tank shutoff valve is to provide an indication that the valve is in motion between positions. This light serves as a visual cue to the pilot or maintenance personnel that the valve is actively transitioning from one state to another, whether it is closing or opening.

Understanding that the in-transit light is specifically designed to signal the movement of the valve is crucial for ensuring operational safety. If the light is illuminated, it informs the operator that the fuel flow control is currently being adjusted, which can be critical during start-up, shutdown, or in emergency situations where quick valve operation is needed.

Other options, such as indicating fuel flow rate, showing the fuel tank level, or signaling an engine fuel feed issue, do not pertain to the specific function of the in-transit light. These functions are associated with other instruments or warning systems within the fuel management system. Thus, the primary purpose of the in-transit light is clearly defined as providing an indication of the valve's movement.