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VOLCANIC ACTIVITY or VOLCANIC ERUPTION”
The following specifications apply:
Pre-eruption volcanic activity in this context means unusual and/or
increasing volcanic activity which could presage a volcanic eruption.
Note.— In case of volcanic ash cloud, pre-eruption volcanic activity or
volcanic eruption, in accordance with Chapter 4, 4.12.3, a post-flight
report shall also be made on the special air-report of volcanic activity
form (Model VAR).
The following phenomena shall be reported only by supersonic
transport at transonic levels and supersonic cruising levels:
• moderate turbulence as “TURBULENCE MODERATE”
Specifications under Item 12 apply.
• hail as “HAIL”
• cumulonimbus clouds as “CB CLOUDS”.
3.2 Information recorded on the volcanic activity reporting form (Model
VAR) is not for transmission by RTF but, on arrival at an aerodrome, is to be
delivered without delay by the operator or a flight crew member to the
aerodrome meteorological office. If such an office is not easily accessible, the
completed form shall be delivered in accordance with local arrangements made
between the Meteorological and ATS Authorities and the operator.
4. Forwarding of meteorological information received
by voice communications
4.1 When receiving routine or special air-reports, air traffic services units
shall forward these air-reports without delay to the associated meteorological
watch office (MWO). In order to ensure assimilation of air-reports in groundbased
automated systems, the elements of such reports shall be transmitted
using the data conventions specified below and in the order prescribed.
— ADDRESSEE. Record station called and, when necessary, relay
required.
— MESSAGE TYPE DESIGNATOR. Record “ARS” for a special airreport.
Note.— Where air-reports are handled by automatic data processing
equipment which cannot accept this message-type designator, in accordance
with Chapter 11, 11.4.2.5.5.2, the use of a different message-type designator
is permitted by regional air navigation agreement.
— AIRCRAFT IDENTIFICATION. Record the aircraft identification using
the data convention specified for Item 7 of the flight plan, without a
space between the operator’s designator and the aircraft registration
or flight identification, if used (e.g. New Zealand 103 as ANZ103).
Section 1
Item 0 — POSITION. Record position in latitude (degrees as 2 numerics
or degrees and minutes as 4 numerics, followed without a space by N or S) and
longitude (degrees as 3 numerics or degrees and minutes as 5 numerics,
followed without a space by E or W), or as a significant point identified by a
coded designator (2 to 5 characters), or as a significant point followed by
magnetic bearing (3 numerics) and distance in nautical miles (3 numerics) from
the point (e.g. 4620N07805W, 4620N078W, 46N078W, LN, MAY, HADDY or
DUB180040). Precede significant point by “ABM” (abeam), if applicable.
Item 1 — TIME. Record time in hours and minutes UTC (4 numerics).
Item 2 — FLIGHT LEVEL OR ALTITUDE. Record F followed by 3 numerics
(e.g. F310), when a flight level is reported. Record altitude in metres followed
by M or in feet followed by FT, when an altitude is reported. Record “ASC” (level)
when climbing, or “DES” (level) when descending.
Section 3
Item 8 — AIR TEMPERATURE. Record “PS” (plus) or “MS” (minus)
followed, without a space, by the temperature in degrees Celsius (2 numerics)
(e.g. MS05).
Item 9 — WIND DIRECTION.
Item 10 — WIND SPEED. Record wind direction in degrees true (3
numerics) and wind speed in kilometres per hour or knots (2 or 3 numerics),
separated by an oblique stroke, indicating the unit used (e.g. 345/55KMH,
170/65KT). Record calm as “00000”.
Item 11 — TURBULENCE. Record severe turbulence as TURB SEV and
moderate turbulence as TURB MOD and light turbulence as TURB FBL.
Item 12 — AIRCRAFT ICING. Record severe icing as ICE SEV, moderate
icing as ICE MOD and light icing as ICE FBL.
Item 13 — HUMIDITY. If reported, record “RH” followed, without a space,
by the humidity in per cent (3 numerics, e.g. RH085).
Note.— Item 13 is optional and shall be included only when available.
Item 14 — PHENOMENON PROMPTING A SPECIAL AIR-REPORT.
Record the phenomenon reported as follows:
• severe turbulence as “TURB SEV”
• severe icing as “ICE SEV”
• severe mountainwave as “MTW SEV”
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