Nigerian Civil Aviation Authority Advisory Circulars from Directorate of Aerodrome and Airspace Standards contain information about standards, practices and procedures by which the Authority provides description or explanation to the part or section of the regulation in other to aid the operator(s)/service provider(s) comply with the said regulation as well as develop an Acceptable Means of Compliance (AMC) where the specific standard is not met. An AMC is not intended to be the only means of compliance with a regulation, and consideration will be given to other methods of compliance that may be presented to the Authority provided safety is given priority.