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AIP
Aeronautical Information Publication

Armenia

eAIP 1st Edition

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ARMATS of ARMENIA

ENR 1.6  Radar services and procedures

1  Primary radar

1.1  Supplementary services
1.1.1 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 the practicability of providing or continuing to provide radar services in any specific case.
1.1.2 Radar services shall be provided by the air traffic control units, which are using the following call signs:
  1. ACC (area control centers) - “Control”;
  2. APP (approach control) - “Approach”;
  3. TWR (tower control) - “Tower”;
1.1.3 Yerevan area control service is operated by two radar stations:
  1. PSR/SSR - station at position 9km south-west from airport Zvartnots “Zvartnots”, range 370 KM;
  2. PSR/SSR - station at airport “Zvartnots” position, range 200 KM;
1.1.4 Gyumri approach service is operated by one radar station. PSR/SSR - station at airport position, range 120 KM (only eastern mode).
1.1.5 Stepanavan approach service is operated by one radar station. PSR/SSR - station at airport position, range 120 KM (only eastern mode).
1.2  The application of radar control service
1.2.1 Radar identification is achieved according to the provisions specified by ICAO.
1.2.2 Radar control service is provided to aircraft operating within Yerevan, Gyumri and Stepanavan TMA and along all AWYs. This service may include:
  1. radar separation of arriving, departing and en-route traffic;
  2. radar monitoring of arriving, departing and en-route traffic to provide information on any significant deviation from the normal flight path;
  3. radar vectoring when required;
  4. assistance to aircraft in emergency;
  5. assistance to aircraft crossing controlled airspace;
  6. warnings and position information on other aircraft considered to constitute a hazard;
  7. information to assist in the navigation of aircraft;
1.2.3 The minimum horizontal radar separations are:
  1. - CTA, UTA and ATS routes: 10 km between identified aircraft in the same and opposite tracks at the same level,
  2. - TMA: 10 km between identified controlled aircraft,
  3. - CTR: 6 km between identified controlled aircraft,
  4. - between aircraft on crossing tracks at the same flight level (altitude) – 40km at the moment of crossing.
  1. - CTA, UTA and ATS routes: 10 km between identified aircraft in the same and opposite tracks at the same level,
  2. - TMA: 10 km between identified controlled aircraft,
  3. - 6 km between succeeding aircraft which are established on the same final approach track to the runway end.
1.2.4 Levels assigned by the radar controller to pilots will provide a minimum terrain clearance according to the phase of flight.
1.3  Radar and radio failure procedures
1.3.1  Radar failure

In the event of radar failure or loss of radar identification, instructions will be issued to restore non-radar standard separation and the pilot will be instructed to communicate with the parent ATS unit.
The longitudinal interval – 10 minutes and in the crossing airways 15 minutes.

1.3.2  Radio failure
1.3.2.1 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.
1.3.2.2  If the aircraft’s radio is unserviceable, the pilot shall affect see GEN 3.4 point 4.4. In case of fully radio communication failure the pilot shall affect according Regional Supplementary Procedures Doc. 7030.
1.4  Graphic portrayal of area of radar coverage

Since the area of radar coverage is identical to that of SSR, seeENR-1.6.3

2  Secondary surveillance radar (SSR)

2.1  Emergency procedures
2.1.1 Except when encountering a state of emergency, pilots shall operate transponders and select modes and codes in accordance with ATC instructions. In particular, when entering Yerevan FIR, pilots who have already received specific instructions from ATC concerning the setting of the transponder shall maintain that setting until otherwise instructed.
2.1.2 Pilots of aircraft about to enter Yerevan FIR who have not received specific instructions from ATC concerning the setting of the transponder shall operate the transponder on Mode A+C, Code 20 (or 2000) before entry and maintain that code setting until otherwise instructed.
In all other circumstances, the transponder shall be set to Mode A+C, Code 77 (or 7700).
2.1.3 If the pilot of an aircraft encountering a state of emergency has previously been directed by ATC to operate the transponder on a specific code, this code setting shall be maintained until otherwise advised.
2.1.4 Notwithstanding the procedure in 2.1.1 above, a pilot may select Mode A+C, Code 77 (or 7700) whenever the nature of the emergency is such that this appears to be the most suitable course of action.
2.1.5 Aircraft equipped only with eastern type of SSR transponder will not be served within Yerevan TMA without special permission from Yerevan ATC center. This dose not applies to ambulance or search and rescue flights. Request for operating single flights must be submitted not later than two hours before the estimated time of departure to the following address:

Tel:+3741 593231

Tel:+37410 593231

Fax:+3741 593304

Fax:+37410 593304

AFS:UDDDZRZX

Note: Continuous monitoring of responses on Mode A Code 77 is provided.

2.2  Radio communication failure and unlawful interference procedures
2.2.1  Radio communication failure procedure

In the event of an aircraft radio receiver failure, a pilot shall select Mode A+C, Code 76 (or 7600) and follow established procedures; subsequent control of the aircraft will be based on those procedures.

2.2.2  Unlawful interference procedure

Pilots of aircraft in flight subjected to unlawful interference shall endeavour to set the transponder to Mode A, Code 7500 to make the situation known, unless circumstances warrant the use of Mode A, Code 77 (or 7700).

Note 1: Mode A, Code 7500 is permanently monitored in the Yerevan FIR/UIR.

Note 2: In emergency situations, which are prescribed above in ENR 1.6 para 2.1 and 2.2, during using the transponder in eastern mode, the crew shall to set mode “EMERGENCY”-“BEDSTVIE”, which is permanently monitoring in Yerevan FIR..

2.3  System of SSR Code assignment

The following functional codes (first two digits) are assigned by Yerevan ACC: The functional codes for arriving and transiting aircraft are supported by Yerevan ACC. The functional codes for departing aircraft are supported by Yerevan APP. :

for international flights3140 – 3177
for domestic flights 0040 – 0057
Figure . Graphic portrayal of area of coverage of radar/SSR
PDF../graphics/Enr 1-6-3.pdf
Figure 1. Graphic portrayal of area of coverage of radar/SSR