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a) identification of the aircraft to which the information
is transmitted;
b) the words TRAFFIC IS or ADDITIONAL TRAFFIC
IS;
c) direction of flight of aircraft concerned;
d) type of aircraft concerned;
e) cruising level of aircraft concerned and ETA for the
significant point nearest to where the aircraft will cross
levels.
11.4.3.1.3 MESSAGES CONTAINING ESSENTIAL LOCAL
11.4.3.1.3 TRAFFIC INFORMATION
Whenever such messages are transmitted they shall contain the
following text:
a) identification of the aircraft to which the information
is transmitted;
b) the words TRAFFIC IS or ADDITIONAL TRAFFIC
IS, if necessary;
c) description of the essential local traffic in terms that
will facilitate recognition of it by the pilot, e.g. type,
speed category and/or colour of aircraft, type of
vehicle, number of persons, etc.;
d) position of the essential local traffic relative to the
aircraft concerned, and direction of movement.
11.4.3.2 MESSAGES CONTAINING METEOROLOGICAL
INFORMATION
Note.— Provisions governing the making and reporting of
aircraft observations are contained in Annex 3. Provisions
concerning the contents and transmission of air-reports are
contained in Chapter 4, Section 4.12 of this document, and the
special air-report of volcanic activity form used for reports of
volcanic activity is shown in Appendix 1 to this document. The
transmission by ATS units, to meteorological offices, of
meteorological information received from aircraft in flight is
governed by provisions in Chapter 4, Section 4.12.6 of this
11-12 Air Traffic Management (PANS-ATM)
1/11/01
document. Provisions governing the transmission by ATS units
of meteorological information to aircraft are set forth in
Annex 11, 4.2 and in this document (see Chapter 4, 4.8.3 and
4.10.4; Chapter 6, Sections 6.4 and 6.6; Chapter 7, 7.3.1; and
Chapter 9, 9.1.3). The written forms of SIGMET and AIRMET
messages and other plain language meteorological messages
are governed by the provisions of Annex 3.
11.4.3.2.1 Information to a pilot changing from IFR
flight to VFR flight where it is likely that flight in VMC
cannot be maintained shall be given in the following manner:
“INSTRUMENT METEOROLOGICAL CONDITIONS
REPORTED (or forecast) IN THE VICINITY OF
(location)”.
11.4.3.2.2 Meteorological information concerning the
meteorological conditions at aerodromes, to be transmitted to
aircraft by the ATS unit concerned, in accordance with
Annex 11, Chapter 4 and this document, Chapter 6,
Sections 6.4 and 6.6 and Chapter 7, Section 7.3.1, shall be
extracted by the ATS unit concerned from the following
meteorological messages, provided by the appropriate
meteorological office, supplemented for arriving and departing
aircraft, as appropriate, by information from indicators relating
to meteorological sensors (in particular, those related to the
surface wind and runway visual range) located in the ATS
units:
a) local meteorological routine and special reports;
b) meteorological reports in the METAR/SPECI code
forms, for dissemination to other aerodromes beyond
the aerodrome of origin (mainly intended for flight
planning, VOLMET broadcasts and D-VOLMET).
11.4.3.2.3 The meteorological information referred to in
11.4.3.2.2 shall be extracted, as appropriate, from meteorological
reports providing information in accordance with the
following:
11.4.3.2.3.1 Mean surface wind direction and speed
11.4.3.2.3.1 and significant variations therefrom
11.4.3.2.3.1.1 In meteorological reports, the direction
shall be given in degrees true and the speed in km/h (kt). All
directional and speed variations shall refer to the preceding
10-minute period. Directional variation shall be given when
the total variation is 60 degrees or more; when the mean speed
is above 6 km/h (3 kt) and the wind varies less than 180
degrees, it shall be expressed as the two extreme directions
between which the wind has varied; otherwise, it shall be
indicated as VRB, followed by the mean speed, with no
indication of the mean wind direction. Speed variations
(gusts) shall be reported only when the variation from the
mean speed is 20 km/h (10 kt) or more.
Note.— Information on surface wind direction provided to
ATS units by the associated meteorological office is referenced
to degrees true North. Information on surface wind direction
obtained from the ATS surface wind indicator and passed to
pilots by ATS units is given in degrees magnetic.
11.4.3.2.3.1.2 In local meteorological routine and special
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