RADAR VECTORING [ICAO]- Provision of navigational guidance to aircraft in the form of specific headings, based on the use of radar.
The benefits to the carrier are fuel and time efficiencies associated with idle descent and shorter traffic patterns than typical radar vectoring allows.[citation needed] ...
As far as horizontal separation is concerned, if you don't have 'Deemed separation' you have to have separation using radar vectoring: this means locking aircraft onto headings.
TERMINAL RADAR SERVICE AREA (TRSA) - Airspace surrounding designated airports wherein ATC provides radar vectoring, sequencing, and separation on a full-time basis for all IFR and participating VFR aircraft.
RNAV procedures offer the advantages of routings that save time and fuel, reduce dependence on radar vectoring, altitude, and speed assignments, which allows for reduction in required radio transmissions with Air Traffic Control, ...
When ATC is Radar vectoring to the final approach course or to the Intermediate Fix, ATC may specify in the approach clearance "CLEARED STRAIGHT-IN (type) APPROACH" to insure the procedure turn or hold-in-lieu-of-PT is not to be flown.
See also: Speed, Service, Separation, Direct, Pilot
 
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