What type of NOTAM contains regulatory information pertaining to flight?

FDC NOTAMs, or Flight Data Center NOTAMs, contain specific information that is regulatory in nature and crucial for flight safety and operations. These NOTAMs typically include information on temporary changes to published flight procedures, airspace usage, or hazards that impact the safety of flight. For example, they may announce changes to instrument approach procedures, updated airspace restrictions, or essential changes in conditions that pilots must be aware of prior to flight.

This type of NOTAM is vital for ensuring that pilots have access to the most current information that could affect their flight plans or safety, thus making them an integral part of pre-flight preparation and awareness. Other types of NOTAMs, like GPS NOTAMs, Local NOTAMs, or General NOTAMs, serve different purposes, generally relating to specific data or information that may not have the same regulatory impact as FDC NOTAMs.