4.3.1.1.1 Due to the factors influencing the nature of the flight information services, and particularly the question of provision of information on possible collision hazards to aircraft operating outside controlled airspace, it is not possible to specify standard texts for these messages.
4.3.1.1.2 Where such messages are transmitted they shall, however, contain sufficient data on the direction of flight and the estimated time, level and point at which the aircraft involved in the possible collision hazard will pass,
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overtake or approach each other. This information shall be given in such a way that the pilot of each aircraft concerned is able to appreciate clearly the nature of the hazard.
4.3.1.2 Messages containing essential traffic information to IFR flights within controlled airspace
4.3.1.2.1 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;
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.
4.3.1.3 Messages containing essential local
traffic information
4.3.1.3.1 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.
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 Part II, Section 15, 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 Part II, Section 16, of this 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 Part II, 9.3 and 12.3; Part IV, 6 and 15; Part V, 7; and Part VII, 1.3). The written forms of SIGMET and AIRMET messages and other plain language meteorological messages are governed by the provisions of Annex 3.
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)”.
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, Part IV, Sections 6 and 15 and Part V, Section 7, 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) meteorological reports disseminated locally at the aerodrome, intended for arriving and departing aircraft;
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