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APP 3-23
APPENDIX 4. TECHNICAL SPECIFICATIONS RELATED TO AIRCRAFT
OBSERVATIONS AND REPORTS
(See Chapter 5 of this Annex.)
1. CONTENTS OF AIR-REPORTS Message type designator
Aircraft identification
1.1 Routine air-reports by air-ground data link Data block 1
Latitude
1.1 .I When air-ground data link is used and automatic Longitude
dependent surveillance (ADS) is being applied, the elements Level
contained in routine air-reports shall be: Time
Message type designator
Aircraft identification
Data block 1
Latitude
Longitude
Level
Time
Data block 2
Wind direction
Wind speed
Wind quality flag
Temperature
Turbulence (if available)
Humidity (if available)
Note.- When ADS is being applied, the requirements of
routine air-reports may be met by the combination of the basic
ADS data block (data block I) and the meteorological information
data block (data block 2). available from ADS reports.
The ADS message format is specified in the PANS-ATM
(Doc 4444), Part 11, Section 14.4 and in Annex 10, Volume 111,
Part I - Digital Data Communication Systems.
1 .I .2 When air-ground data link is used while ADS is not
being applied, the elements contained in routine reports shall
be in accordance with 1.3.
Note.- When air-ground data link is used while ADS'is not
being applied, the requirements of routine air-reports may be
met by the controller-pilot data link communication (CPDLC)
application entitled "Position report". The details of this data
link application are specified in the Manual of Air Traffic
Services Data Link Applications (Doc 9694) and in Annex 10,
Volume Ill, Part I.
1.2 Special air-reports by air-ground data link
When air-ground data link is used, the elements contained in
special air-reports shall be:
Data block 2
Wind direction
Wind speed
Wind quality flag
Temperature
Turbulence (if available)
Humidity (if available)
Data block 3
Condition prompting the issuance of a special air-report
(one condition to be selected from the list presented in
Table A4-3).
Note I.- The requirements of special air-reports may be
met by the data link flight information service (D-FIS) application
entitled "Special air-report service". The details of this
data link application are specified in Doc 9694.
Note 2.- In the case of a special air-report ofpre-eruption
volcanic activity, volcanic eruption or volcanic ash cloud,
additional requirements are indicated in 4.2.
1.3 Routine air-reports by voice communications
When voice communications are used, the elements contained
in routine air-reports shall be:
Message type designator
Section 1 (Position information)
Aircraft identification
Position or latitude and longitude
Time
Flight level or altitude
Next position and time over
Ensuing significant point
Section 2 (Operational information)
Estimated time of arrival
Endurance
ANNEX 3 APP 4-1
Annex 3 - Meteorological Service for International Air Navigation Appendir 4
Section 3 (Meteorological information)
Air temperature
Wind direction
Wind speed
Turbulence
Aircraft icing
Humidity (if available)
1.4 special air-reports by voice communications
When voice communications are used, the elements contained
in special air-reports shall be:
Message type designator
Section 1 (Position information)
Aircraft identification
Position or latitude and longitude
Time
2.4 Wind quality flag
The wind quality flag shall be reported as 0 when the roll
angle is less than 5 degrees and as 1 when the roll angle is
5 degrees or more.
2.5 Temperature
The temperature shall be reported to the. nearest tenth of a
degree Celsius.
The turbulence shall be observed in terms of the eddy dissipation
rate (EDR).
2.6.1 Routine air-reports
Flight level or altitude The turbulence shall be reported during the en-route phase of
the flight and shall refer to the 15-minute period immediately
Section 3 (Meteorological information) preceding the observation. Both the average and peak value of
Condition prompting the issuance of a special air-report, turbulence, together with the time of occurrence of the peak
to be selected from the list presented in Table A4-3. value to the nearest minute, shall be observed. The average
and peak values shall be reported in terms of a turbulence
Note 1.- Airmreports are considered by default. i-he index comprising seven intensity levels of EDR as indicated in
message type designator for special air-reports is specified in Table A4-1- The time of occurrence of the peak value shall be
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