To continue refueling after the HI-LEVEL TEST, which switch should be set to the NORMAL position?

After completing the HI-LEVEL TEST on the C-17, it is essential to set the TEST SELECT switch to the NORMAL position to enable continued refueling. This switch is specifically designed to control the operational mode for the refueling system. When the TEST SELECT switch is in the TEST position, it allows for system checks and diagnostics. However, to resume regular refueling operations, the switch must be returned to the NORMAL position, which facilitates the standard flow of fuel during refueling procedures.

The other switches mentioned in the question have different functions: the Fill valve switch controls the opening and closing of the fuel fill valves, the Avionics switch manages power to avionics systems but is not directly involved in the refueling process, and the Fuel dump switch is used to jettison fuel. None of these switches will affect the refueling operation as directly as the TEST SELECT switch will. Therefore, ensuring that the TEST SELECT switch is set to NORMAL is critical for the successful continuation of refueling after conducting the HI-LEVEL TEST.