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infonnation service and air traffic control service, the provision
of air traffic control service shall have precedence over the
provision of flight information service whenever the provision
of air traffic control service so requires.
Note.- It is recognized that in certain circumstances
aircrafi on final approach, landing, take-off and climb may
require to receive without delay essential information other
than that pertaining to the provision of air traffic control
service.
4.2 Scope of flight information service
4.2.1 Flight information service shall include the provision
of pertinent:
a) SIGMET and AIRMET isformation;
b) information concerning pre-eruption volcanic activity.
volcanic eruptions and volcanic ash clouds;
C) information concerning the release into the atmosphere
of radioactive materials or toxic chemicals;
d) information on changes in the serviceability of navigation
aids;
e) information on changes in condition of aerodromes and
associated facilities, including information on the state
of the aerodrome movement areas when they are affected
by snow, ice or significant depth of water;
f ) information on unmanned free balloons;
and of any other information likely to affect safety.
4.2.2 Flight information service provided to flights shall
include, in addition to that outlined in 4.2.1, the provision of
information concerning:
a) weather conditions reported or forecast at departure,
destination and alternate aerodromes;
b) collision hazards, to aircraft operating in airspace
Classes C, D, E, F and G;
C) f o f~li ght over water areas, in so far as practicable and
when requested by a pilot, any available infonnation
such as radio call sign, position, true track, speed, etc.,
of surface vessels in the area.
Note 1.- The information in b), including only known
aircraft the presence of which might constitute a collision
hazard to the aircraft informed, will sometimes be incomplete
and air traffic services cannot assume responsibility for its
issuance at all times or for its accuracy.
Note 2.- When there is a need to supplement collision
hazard information provided in compliance with b), or in case
of temporary disruption offlight information service, traffic
information broadcasts by aircraft may be applied in
designated airspaces. Guidance on traffic infonnation broadcasts
by aircrafi and related operating procedures is contained
in Attachment C.
4.2.3 Recommendation.- ATS units should transmit, as
soon as practicable, special air-reports to other aircraft
concerned, to the associated meteorological office, and to
other ATS units concerned. Transmissions to aircrafi should
be continued for a period to be determined by agreement
between the meteorological and air traffic services authorities
concerned.
4.2.4 Flight information service provided to VFR flights
shall include, in addition to that outlined in 4.2.1, the provision
of available information concerning traffic and weather conditions
along the route of flight that are likely to make operation
under the visual flight rules impracticable.
4.3 Operational flight information
service broadcasts
4.3.1 Application
4.3.1.1 The meteorological infonnation and operational
information concerning navigation aids and ~rodromes
included in the flight infonnation service shall. whenever
available, be provided in an operationally integrated form.
ANNEX 11 4- 1 w1m
No. 43
Annex 11 - Air Tram Services Chapter 4
4.3.1.2 Recommendation.- Where integrated operational
flight information messages are to be transmitted to
aircrafr, they should be transmitted with the content and,
where specified, in the sequence indicated, for the various
phases of jlight.
4.3.1.3 Recommendation.- Operational flight information
service broadcasts, when provided, should consist of
messages containing integrated information regarding selected
operational and meteorological elements appropriate to the
various phases of jlight. These broadcasts should be of three
major types, i.e. HF, VHF and ATIS.
4.3.1.4 Use of the OFIS messages in directed
requestheply transmissions
g) the full broadcast message should be repeated if this is
feasible within the remainder of the time allotted to the
broadcasting station;
h) the broadcast information should be updated immediately
a signijkant change occurs; and
i) the HF OFIS message should be prepared and disseminated
by the most appropriate unit(s) as designated by
each State.
4.3.2.3 Recommendation.- Pending the development
and adoption of a more suitable form of speech for universal
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