What action should be taken immediately after ensuring the landing gear is down?

When the landing gear has been confirmed to be down, it is crucial to ensure communication and coordination with the co-pilot before proceeding to land. This step is vital for safety and operational efficiency in the cockpit. The co-pilot can assist in confirming the landing gear status and monitoring other parameters during the approach. This collaboration helps ensure that all flight operations are well-coordinated and that any last-minute checks or adjustments are made as necessary.

While checking for abnormal sounds or vibrations, preparing for take-off clearance, and deploying extra flaps may be important in other contexts, they are not the immediate actions required after confirming the landing gear is down. The priority immediately following this confirmation is to communicate with the co-pilot to finalize preparations for a safe landing.