What must be done before rigging a Pilot's ladder?

Before rigging a Pilot's ladder, the correct step is to inspect the ladder for defects. This inspection is crucial because it ensures that the ladder is safe for use and that it can support the weight and provide a secure means for the pilot to board the vessel. A thorough inspection would include checking for any physical damage, wear and tear, and ensuring that all parts are functioning correctly.

While preventative maintenance as per MRC is important for the overall upkeep of equipment and safety protocols on board, the immediate action prior to rigging the ladder focuses on verifying its condition. This step directly addresses safety concerns and ensures that there are no hazards that could jeopardize the pilot's safety during boarding or disembarking.

Additional preparations, such as securing lines or signaling readiness, are necessary parts of the process but come after confirming that the Pilot's ladder itself is in proper working order. Therefore, inspecting the ladder for defects is the correct action to undertake initially.