
reduces the need to maintain sensor-specific routes and procedures, and their costs.PBN offers a number of advantages over the sensor-specific method of developing airspace and obstacle clearance criteria: Technology can evolve over time without requiring the operation itself to be revisited as long as the requisite performance is provided by the RNAV or RNP system. A chosen solution would be the most cost-effective for the civil aviation authority, as opposed to a solution being established as part of the operational requirements. Civil aviation authorities then evaluate options in respect of available technology and navigation services. Under PBN, generic navigation requirements are first defined based on the operational requirements. The navigation specifications provide specific implementation guidance in order to facilitate global harmonisation. Performance requirements are identified in navigation specifications, which also identify the choice of navigation sensors and equipment that may be used to meet the performance requirements. One not having such requirements is referred to as an area navigation (RNAV) specification. A navigation specification that includes an additional requirement for on-board navigation performance monitoring and alerting is referred to as a required navigation performance (RNP) specification. Historically, aircraft navigation specifications have been specified directly in terms of sensors (navigation beacons and/or waypoints).


8 Minimum navigation performance specifications.6 On-board performance monitoring and alerting.
