According to ICAO (Advisory Circular 91-009) a Flight Operational Safety Assessment or FOSA must be conducted for RNP AR APCH procedures when the specific aircraft characteristics,
operational environment, obstacles, etc., warrant the conduction of an additional assessment to ensure that safety objectives are met. This assessment must give proper attention to the inter-dependence of design, aircraft capability, crew procedure, and operational environment elements. The FOSA is a key part of the operational authorization for RNP AR APCH procedures. This methodology is associated with a specific type of aircraft or a specific performance, and may be applied to a demanding environment.
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