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2) messages originated by an aircraft operating agency or
by an aircraft, of immediate concern to an aircraft in
flight;
3) meteorological advice of immediate concern to an
aircraft in flight or about to depart (individually
communicated or for broadcast);
4) other messages concerning aircraft in flight or about to
depart.
5.1.8.5 Meteorological messages shall comprise meteorological
information to or from aircraft, other than those in
5.1.8.4, 3).
5.1.8.6 Flight regularity messages shall comprise the
following:
1) messages regarding the operation or maintenance of
facilities essential for the safety or regularity of aircraft
operation;
2) messages concerning the servicing of aircraft;
3) instructions to aircraft operating agency representatives
concerning changes in requirements for passengers and
crew caused by unavoidable deviations from normal
operating schedules. Individual requirements of passengers
or crew shall not be admissible in this type of
message;
4) messages concerning non-routine landings to be made
by the aircraft;
5) messages concerning aircraft parts and materials
urgently required;
6) messages concerning changes in aircraft operating
schedules.
5.1.8.6.1 Air traffic services units using direct pilotcontroller
communication channels shall only be required to
handle flight regularity messages provided this can be
achieved without interference with their primary role and no
other channels are available for the handling of such messages.
N o t e . The messages at 5.1.8.4, 2) and 5.1.8.6, 1) to 6)
typzh some of the operational control communications deJined
in Chapter 1.
5.1.8.7 Recommendation.- Messages having the same
priority should, in general, he transmitted in the order in
which they are received for transmission.
5.1.8.8 Interpilot air-to-air communication shall comprise
messages related to any matter affecting safety and regularity
of flight. The category and priority of these messages shall be
determined on the basis of their content in accordance with
5.1.8.
5.1.9 Cancellation of messages
5.1.9.1 Incomplete transmissions. If a message has not
been completely transmitted when instructions to cancel are
received, the station transmitting the message shall instruct the
receiving station to disregard the incomplete transmission. Ths
shall be effected in radiotelephony by use of an appropriate
phrase
5.1.9.2 Complete transmissions
Recommendation.- When a completed message
transmission is being heldpending correction and the receiving
station is to he informed to take no forwarding action, or when
delivery or onward relay cannot he accomplished, transmission
should he cancelled. This should he effected in radiotelephony
by the use of an appropriate phrase.
5.1.9.3 The station cancelling a transmission shall be
responsible for any further action required.
5.2 Radiotelephony procedures
N o t e . When Selective Calling (SELCAL) equipment is
used certain of the following procedures are superseded by
those contained in 5.2.4.
Chapter 5 Annex 10 - Aeronautical Telecommunications
5.2.1 General
5.2.1.1 PANS.- When a controller or pilot communicates
via voice, the response should be via voice. Except as
provided by 8.2.12.1, when a controller or pilot communicates
via CPDLC, the response should be via CPDLC.
5.2.1.2 Language to be used
5.2.1.2.1 The air-ground radiotelephony communications
shall be conducted in the language normally used by the
station on the ground or in the English language.
Note 1 .Th e language normally used by the station on the
ground may not necessarily be the language of the State in
which it is located. A common language may be agreed upon
regionally as a requirement for stations on the ground in that
region.
Note 2 .Th e level of language proficiency required for
aeronautical radiotelephony communications is speczj?ed in
the Appendix to Annex 1.
5.2.1.2.2 The English language shall be available, on
request from any aircraft station, at all stations on the ground
serving designated airports and routes used by international air
services.
5.2.1.2.3 The languages available at a given station on the
ground shall form part of the Aeronautical Information
Publications and other published aeronautical information
concerning such facilities.
5.2.1.3 Word spelling in radiotelephony. When proper
names, service abbreviations and words of whch the spelling
is doubtful are spelled out in radiotelephony the alphabet in
Figure 5-1 shall be used.
Note 1 .Th e pronunciation of the words in the alphabet as
　
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