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cloud of operational significance, the ASHTAM also provides
information on the location, extent and movement of the ash
cloud and the air routes and flight levels affected.
1.3 Issuance of an ASHTAM giving information on a volcanic
eruption, in accordance with section 3 below, should not
be delayed until complete information A) to K) is available but
should be issued immediately following receipt of notification
that an eruption has occurred or is expected to occur, or a
change in the status of activity of a volcano of operational
significance has occurred or is expected to occur, or an ash
cloud is reported. In the case of an expected eruption, and
hence no ash cloud evident at that time, items A) to E) should
be completed and items F) to I) indicated as "not applicable".
Similarly, if a volcanic ash cloud is reported, e.g. by special
air-report, but the source volcano is not known at that time, the
ASHTAM should be issued initially with items A) to E)
indicated as "unlcnown", and items F) to K) completed, as
necessary, based on the special air-report, pending receipt of
finther information. In other circumstances, if information for
a specific field A) to K) is not available indicate 'NIL".
1.4 The maximum period of validity of ASHTAM is
24 hours. New ASHTAM must be issued whenever there is a
change in the level of alert.
2. Abbreviated heading
2.1 Following the usual AFTN communications header,
the abbreviated heading "TT AAiiii CCCC MMYYGGgg
(BBB)" is included to facilitate the automatic processing of
ASHTAM messages in computer data banks. The explanation
of these symbols is:
TT = data designator for ASHTAM = VA;
AA = geographical designator for States, e.g. NZ = New
Zealand (see Location Indicators (Doc 7910), Part 2,
Index to Nationality Letters for Location Indicators);
iiii = ASHTAM serial number in a four-figure group;
CCCC = four-letter location indicator of the flight information
region concerned (see Location Indicators
(Doc 79 1 O), Part 5, addresses of centres in charge of
FIR/UIR);
MMYYGGgg = dateltime of report, whereby:
MM = month, e.g. January = 01, December = 12
YY = day of the month
GGgg = time in hours (GG) and minutes (gg) UTC;
(BBB) = Optional group for correction to an ASHTAM
message previously disseminated with the same serial
number = COR.
Note.- Brackets in (BBB) are used to indicate that this
group is optional.
Example: Abbreviated heading of ASHTAM for Auckland
Oceanic FIR, report on 7 November at 0620 UTC:
VANZOOOI NZZO 11 070620
3. Content of ASHTAM
3.1 Item A - Flight information region affected, plainlanguage
equivalent of the location indicator given in the
abbreviated heading, in this example "Auckland Oceanic
FIR".
3.2 Item B - Date and time (UTC) of first eruption.
3.3 Item C - Name of volcano, and number of volcano as
listed in the ICAO Manual on Volcanic Ash, Radioactive
Material and Toxic Chemical Clouds (Doc 969 l), Appendix H,
and on the World Map of Volcanoes and Principal Aeronautical
Features.
3.4 Item D - LatitudeJLongitude of the volcano in whole
degrees or radial and distance of volcano from NAVAID (as
listed in the ICAO Manual on Volcanic Ash, Radioactive
Material and Toxic Chemical Clouds (Doc 969 I), Appendix H,
and on the World Map of Volcanoes and Principal Aeronautical
Features).
3.5 Item E - Colour code for level of alert indicating
volcanic activity, including any previous level of alert colour
code as follows:
APP 3-2
Appendix 3 Annew IS - Aeronautical Information Services
Level of
alert colour
code Status of activity of volcano
RED Volcanic eruption in progress. Ash plumelcloud reported above FL 250.
ALERT
or
Volcano dangerous, eruption likely, with ash plume/cloud expected to rise
above FL 250.
ORANGE Volcanic eruption in progress but ash plume/cloud not reaching nor
ALERT expected to reach FL 250.
Volcano dangerous, eruption likely but ash plumdcloud not expected to
reach FL 250.
YELLOW Volcano known to be active from time to time and volcanic activity has
ALERT recently increased significantly, volcano not currently considered dangerous
but caution should be exercised.
(After an eruption, i.e. change in alert to yellow from red or orange.)
Volcanic activity has decreased significantly, volcano not currently
considered dangerous but caution should be exercised.
GREEN Volcanic activity considered to have ceased and volcano reverted to its
ALERT normal state.
Note.- The colour code for the level of alert indicating the status of activity of the volcano
　
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