What action should you take before signaling the smoking lamp is out during refueling?

Signaling that the smoking lamp is out during refueling is a critical safety protocol on a vessel, as it indicates that smoking is prohibited due to the presence of flammable materials. Before making this signal, it is essential to notify the crew through the 1MC public address system. This action provides a clear communication method to ensure that all personnel on board are aware of the prohibition against smoking and can take the necessary precautions to maintain safety during the fuel operation.

Effective communication via 1MC is vital because it reaches the entire crew simultaneously, ensuring that everyone understands that smoking is not permitted at that time. This is crucial in maintaining an environment free from potential ignition sources during the refueling process, thus enhancing safety and minimizing the risk of fire or explosions.

While locking chains, logging actions, and ensuring personnel wear protective gear are also important safety practices during refueling operations, notifying the crew is the first and most immediate step that directly affects the safety and awareness of all personnel on board.