What should be done after successfully connecting the fuel nozzle?

Locking the fuel nozzle in position is an essential step after successfully connecting it to ensure that a proper and secure connection is maintained during the refueling process. This action prevents any accidental disconnection that could lead to fuel spillage or disruptions in fuel flow, which are critical for safety procedures in aircraft maintenance.

Ensuring that the nozzle is firmly locked allows for proper sealing, preventing vapor leaks and maintaining the integrity of the fuel system. This step is part of standard operating procedures aimed at ensuring both the safety of personnel and the aircraft during refueling operations.

The other actions, while related to the overall refueling or operational process, do not follow directly after connecting the fuel nozzle. Inspecting fuel flow, for instance, is important, but it typically comes after securing the nozzle. Releasing pressure and turning on external power are also vital steps in various maintenance or pre-flight check procedures, but they should not be prioritized immediately following the connection of the fuel nozzle.