Safety assessment of RNP AR approach procedures

Abstract

The required navigation performance authorisation required (RNP AR) approach, which is one of the performance-based navigation procedures, enables safer and efficient flight operations in busy and challenging mountainous areas. The RNP system increases situational awareness of pilots because of including monitoring and alerting service on board and ensuring lateral track accuracy of up to +/- 0.1 NM. In this study, RNP AR approach (RNP AR APCH) procedures which will be a solution to prevent controlled flight into terrain (CFIT) accidents are defined. CFIT accidents mostly occur in the approach and landing phase of flights because of the lack of precision approaches. Moreover, flight operational safety assessment (FOSA) methodology published for only RNP AR APCH procedures is assessed. The FOSA is a significant part of the operational authorisation for RNP AR APCH procedures and also is applied to evaluate particular cases and could be useful method for mitigating the risk of CFIT.