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Supplementary services
A radar unit normally operates as an integral part of the parent ATS unit and provides radar service to aircraft to the maximum extent practicable, to meet the operational requirement. Many factors, such as radar coverage, controller workload and equipment capabilities, may affect these services, and the radar controller shall determine whether he is able to provide, or continue to provide radar services in each specific case.
A pilot will know when radar services are provided by use of following phrases by a radar controller:
a. “... (call sign), radar contact ...”
b. “... (call sign), identified ...”
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The application of radar control service
Radar identification is achieved in accordance with the provisions specified by ICAO.
A radar control service is provided in controlled airspaces to aircraft operating within the Riga TMA above 1500 FT MSL and along all AWYs above FL 095. This service may include: -
- radar separation of arriving, departing and en-route traffic;
- radar monitoring of arriving, departing and en-route traffic to provide information on any significant deviation from the normal flight path;
- radar vectoring when required;
- assistance to aircraft in an emergency;
- assistance to aircraft crossing controlled airspace;
- warnings and position information on other aircraft considered to constitute a hazard;
- information to assist in the navigation of aircraft.
The minimum horizontal radar separations are:
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- CTA and ATS routes: 5 NM between identified controlled aircraft in the same, opposite or crossing track, at the same level;
- TMA RIGA: 3 NM between identified controlled aircraft;
- 10 NM between identified and unidentified aircraft, in all cases.
Levels assigned by the radar controller to pilots will provide a minimum terrain clearance according to the phase of flight.
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Radar and air-ground communication failure procedures
Radar failure
In the event of radar failure or loss of radar identification, the appropriate ATS unit shall establish: the longitudinal interval - 10 minutes and in the crossing airways - 10 minutes.
Radio failure
The radar controller will establish whether the aircraft radio receiver is working by instructing the pilot to carry out a turn or turns. If the turns are observed, the radar controller will continue to provide radar service to the aircraft.
If the aircraft radio is completely unserviceable, the pilot should carry out the procedures for radio failure in accordance with ICAO provisions. If radar identification has already been established, the radar controller will vector other identified aircraft clear of its track until such time as the aircraft leaves radar coverage. -
Voice and CPDLC position reporting requirements
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Graphic portrayal of area of radar coverage
PSR station at Riga, position 565547.00N 0235705.41E, range 80 NM.
For the area of radar coverage see Figure 1 - Area of Primary Radar Coverage.