B-RNAV

Basic Area Navigation (B-RNAV) is the forerunner of the RNAV programme. It was introduced to enable capacity gains to be achieved through modifications to the en-route structure. It requires aircraft conformance to a track-keeping accuracy of ± 5NM for at least 95% of flight time to ensure that the capacity gains are achieved whilst meeting the required safety targets.

B-RNAV can be achieved using inputs from VOR/DME, DME/DME or GPS. (INS may be used for up to 2 hours after the last radio or on-ground update. Loran C may be used in European airspace where suitable coverage exists and the aircraft system has been certified to FAA AC 20-121A – no JAA advisory material exists for LORAN C). The JAA has published a Temporary Guidance Leaflet (TGL) No 2, AMJ 20X2, entitled Guidance Material On Airworthiness Approval And Operational Criteria For The Use Of Navigation Systems In European Airspace Designated For Basic RNAV Operations.

B-RNAV requirements became mandatory in ECAC airspace on 23 April 1998 on the entire ATS route network above FL 95. (In certain States the minimum Flight Level was initially set higher) B-RNAV is also being used on selected routes into and out of terminal airspace in some States.

 Next Page