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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) for flight over water areas, in so far as practicable and
when requested by a pilot, any available information
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 of flight information service, traffic
information broadcasts by aircraft may be applied in
designated airspaces. Guidance on traffic information broadcasts
by aircraft 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 aircraft 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 information and operational
information concerning navigation aids and aerodromes
Annex 11 — Air Traffic Services Chapter 4
1/11/01 4-2
included in the flight information service shall, whenever
available, be provided in an operationally integrated form.
4.3.1.2 Recommendation.— Where integrated operational
flight information messages are to be transmitted to
aircraft, they should be transmitted with the content and,
where specified, in the sequence indicated, for the various
phases of flight.
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 flight. These broadcasts should be of three
major types, i.e. HF, VHF and ATIS.
4.3.2 HF operational flight information
service (OFIS) broadcasts
4.3.2.1 Recommendation.— HF operational flight information
service (OFIS) broadcasts should be provided when it
has been determined by regional air navigation agreements
that a requirement exists.
4.3.2.2 Recommendation.— Whenever such broadcasts
are provided:
a) the information should be in accordance with 4.3.2.5, as
applicable, subject to regional air navigation agreements;
b) the aerodromes for which reports and forecasts are to
be included should be as determined by regional air
navigation agreements;
c) the time-sequencing of stations participating in the
broadcast should be as determined by regional air
navigation agreements;
d) the HF OFIS broadcast message should take into
consideration human performance. The broadcast message
should not exceed the length of time allocated for it
by regional air navigation agreements, care being taken
that the readability is not impaired by the speed of the
transmission;
Note.— Guidance material on human performance
can be found in the Human Factors Training Manual
(Doc 9683).
e) each aerodrome message should be identified by the
name of the aerodrome to which the information
applies;
f) when information has not been received in time for a
broadcast, the latest available information should be
included together with the time of that observation;
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
　
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