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inclusion in ATIS.
Remark: Due to obsolete software of ATIS system, the requirements will be fully complied with
in October 2006.
4.4.2 b)
4.4.3
SPECI reports are not issued.
Remark: In accordance with EUR ANP.
4.5.1 i) At Liepaja and Ventspils aerodromes, cloud type is not available in automated reports.
4.6.1.1 At Riga aerodrome in local routine and special reports, the surface wind mean direction is reported
in magnetic degrees.
Remark: Local routine and special reports are used only for ATC purposes and ATIS broadcasts.
4.6.2.1 Definition of prevailing visibility is not applicable for Liepaja and Ventspils aerodromes; for Riga
aerodrome it is applicable when automated equipment for the measurement of visibility is used.
Remark: Priority is given to the concept of visibility representative of areas of concern to the
safety of flight operations.
4.6.2.3* At Riga aerodrome the reported visibility in METAR is representative of the touchdown zone of
the runway in use when automated equipment for the measurement of visibility is not used. At
Liepaja and Ventspils aerodromes the reported visibility representative of the point of observation
is obtained from a stand-alone weather observing system.
4.6.4.3* Phenomena in the vicinity of the aerodrome are not included in automated reports.
2 LATVIA SUPPLEMENT TO ANNEX 3 (FIFTEENTH EDITION)
* Recommended Practice
22/9/06
CHAPTER 5
5.2 a) Routine aircraft observations during en-route and climb-out phases of the flight are not made.
Remark: ATS/MET reporting points within Riga FIR are not established.
CHAPTER 6
6.2.1 Aerodrome forecasts for Ventspils aerodrome are not issued.
Remark: No requirements from operators. Compliance is expected by 2008.
6.6.3 Area forecasts for low-level flights are only issued during the daytime period.
Remark: Due to the low density of traffic operation below flight level 100 during night hours.
Compliance is expected by 2007.
CHAPTER 7
7.2.1 AIRMET information is only issued during the daytime period.
Remark: Due to the low density of traffic operating below flight level 100 during night hours.
Compliance is expected by 2007.
7.4.1 Wind shear warnings are issued for Riga aerodrome only.
CHAPTER 8
8.1.1 Aerodrome climatological summaries and tables are available only for Riga aerodrome.
Remark: Compliance is expected by 2008.
APPENDIX 2
2.2 Notification concerning significant discrepancies detected or reported in respect of WAFS
products is not sent to the WAFC concerned.
Remark: The reporting procedure is not clearly determined by the WAFC concerned.
APPENDIX 3
2.1.1 Local routine and special reports at Liepaja and Ventspils aerodromes are not issued in
abbreviated plain language in accordance with the template shown in Table A3-1.
Remark: Due to technical characteristics of observing systems.
SUPPLEMENT TO ANNEX 3 (FIFTEENTH EDITION) LATVIA 3
* Recommended Practice
22/9/06
2.3.1 c) Local special reports due to an increase in air temperature of 2oC or more are not issued at Liepaja
and Ventspils aerodromes.
Remark: Due to technical characteristics of observing systems.
2.3.1 d) The occurrence of moderate/severe turbulence, moderate/severe icing and winds shear in the
approach and climb-out areas are criteria for the issuance of local special reports.
2.3.1 e) At Liepaja and Ventspils aerodromes (during non-operational hours of the aerodromes) automated
local special reports when IC, DR (DU, SA, SN), BL (DU, SA, SN), TS, SQ, VA and FC occurs
are not issued.
Remark: Absence of technical capabilities for the automatic observing system. Detailed
information for pilots’ attention is given in Latvia AIP.
2.3.2* f), i), k) RVR, cloud base and vertical visibility thresholds for the issuance of local special reports are
determined specifically for Riga aerodrome.
Remark: To reduce the number of updates to the ATIS, thresholds have been agreed during
consultation with ATS authority.
2.3.2* d) The thresholds for the wind changes through values of operational significance are not established.
Remark: The threshold for the runway tailwind and crosswind components changes are established
in accordance with ICAO Procedures for Air Navigation Services — Air Traffic Management
(PANS-ATM, Doc 4444) requirements only for aerodrome control tower (TWR) purposes.
4.1.1.1* Surface wind is observed at a height of 6 m above the runway at Liepaja and Ventspils aerodromes.
Remark: Due to technical characteristics of the observing system. Compliance is expected by
2013.
4.1.4.1 At Riga aerodrome in local routine and special reports the surface wind direction is reported in
　
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