This Advisory Circular is a reference document on Flight Inspections and calibration of navigation and landing aids. It provides policy, procedures, information and guidance on how the Service Provider can implement the requirements in the relevant parts of Nigeria Civil Aviation Regulations. This is the first edition of the advisory circular on flight inspection and Calibration of navigation and landing aids. The document describes inspection types and facilities subject to flight inspections and their periodicity of inspection as acceptable means of compliance with the requirements of Nig. CARs 14.7.24-14.7.25. It further describes flight Inspection preparations, planning, co-ordination, notification of flight inspection status and presentation of flight inspection and calibration report. It details the requirements for authorization of flight Inspection Organization, crew members, airborne and ground support equipment requirements.