Different airways have different requirements.
The PBN Manual
The
PBN Manual (Doc 9613) comprises two Volumes.
Volume I of the PBN Manual is made up of two parts: Part A describes the PBN Concept, The Airspace Concept and how the PBN Concept is used in practice. Part B provides Implementation Guidance for ANSPs in the form of three processes.
Volume II of the PBN Manual is also made up of three parts. Part A describes on-board performance monitoring and alerting and Safety Assessments, whilst Parts B and C contain ICAO’s RNAV and RNP specifications which are to be used by States as a basis for certification and operational approval.
The B-RNAV standard contained in EASA AMC 20-4 is identical to the RNAV 5 specification in ICAO PBN. The term B-RNAV has been replaced by RNAV 5. RNAV 5 is now required for operation on all ATS routes in UK airspace.
The UK P-RNAV standard is not identical to the ICAO RNAV 1 specification but may be viewed as a European Application of the RNAV 1 specification. The difference between P-RNAV and RNAV1 centres on the allowable ground navigation aids and the PBN Manual identifies additional requirements for obtaining RNAV 1 approval for an operator already having approval against JAA TGL 10.