What is the purpose of FDC NOTAMs?

The purpose of FDC NOTAMs is to advise of changes in flight data that affect procedures, which aligns perfectly with the chosen answer. FDC NOTAMs, or Flight Data Center Notices to Airmen, are essential in ensuring that pilots receive timely and accurate information regarding significant changes affecting air navigation, airspace, and operational procedures. This includes updates on instrument approach procedures, temporary flight restrictions, and other critical information that could impact flight safety or operations. By disseminating this information, FDC NOTAMs help maintain safe and efficient air traffic management, ensuring pilots are well-informed before and during their flights.

In contrasting this with the other choices, while providing information on navigation facilities and issuing notices quickly can be important, they do not specifically capture the essence of what FDC NOTAMs are primarily used for. Non-urgent flight information communication also falls outside the main focus of FDC NOTAMs, which specifically cater to urgent updates that directly affect flight operations and safety.