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44 Seventh Session of the With the creation of Volume I1 and the inclusion of appropriate provi-
COM Division sions which up to that time were included in Doc 7181 P A N S -
Radiotelephony Procedures, a general rearrangement of the provisions
relating to communications procedures was necessary and was
effected in the new Volume 11.
45 Sixth Meeting of the Panel of A number of detailed changes in the AFTN procedures; amendment
Teletypewriter Specialists; to Chapters 5 and 6, to indicate more precisely the procedures to be
Fourth AN Conference used when communications take place directly between a pilot and an
air traffic controller; and a rewording of 3.7 - Use of Abbreviations
and Codes, to correct an unintentional change in meaning introduced
in Amendment 42.
46 Fifth Meeting of the ATC Provisions for the transmission of ATS messages intended for use in
Automation Panel an ATC computer.
47 COMIOPS Divisional Introduction of new simplified Aeronautical Mobile Distress
Meeting Procedures which are better suited to the special requirements of
international civil aviation.
48 Seventh Meeting of the Panel Introduction of changes to message classification and teletypewriter
of Teletypewriter Specialists procedures in the light of experience gained in automated operation of
the AFTN.
49 First Meeting of the Automated Provision concerning the use of the 7-unit code for data interchange
Data Interchange Systems at medium signalling rates; introduction of provisions relating to the
Panel; Sixth AN Conference categories of aeronautical mobile service messages. On the basis of
the study of consolidation and presentation of the Regional Sup
plementary Procedures, it introduces provisions relating to:
appropriate diversion routing lists at AFTN communication centres;
early transmission of AFTN messages bearing Priority Indicators GG
or higher; guarding of 121.5 MHz during long over-water flights;
action by aeronautical stations receiving an air-report or a message
containing meteorological information transmitted by an aircraft; and
the action taken by a station receiving a distress message or an
emergency message; and when it is aware that the distress condition
is ended.
31 May 1965
1 October 1965
10 March 1966
12 December 1966
12 April 1967
24 August 1967
7 June 1967
5 October 1967
8 Februaly 1968
11 December 1967
11 April 1968
22 August 1968
23 Janualy 1969
23 May 1969
18 September 1969
1 June 1970
1 October 1970
4 Februaly 1971
27111103
No. 78
Annex 10 - Aeronautical Telecommunications
Adopted
Effective
Amenhent Source (s) Su bject(s) Applicable
50 Fifth NAT RAN Meeting;
Second Meeting of the
Automated Data Interchange
Systems Panel; Air Navigation
Study on RAN Meeting
recommendations of
worldwide applicability;
Sixth AN Conference
Introduction of the term "Hertz (Hz)" in place of the term "cycles per
second (c/ s)" as the unit of frequency for electric and radio-technical
matters; changes in the provisions relating to short-term and longterm
retention of AFTN trafic records and the period of thirty days
for the retention of communications logs; expansion of the
Introduction to Volume I1 with material relating to the 7-unit coded
character set; introduction of the definitions for "ATS direct speech
circuif', "Meteorological operational channel" and "Meteorological
operational telecommunication network; reorganizahon of the
provisions at Chapters 3 and 4 by grouping under Chapter 3 the
general provisions for the four parts of the international aeronautical
telecommunication service and under Chapter 4 the provisions
relating to the aeronautical fixed service, including the aeronautical
fixed telecommunication network; provisions concerning the
recording of air-reports in AIREP form.
24 March 1972
24 July 1972
7 December 1972
Sixth EUM RAN Meeting Introduction of provisions concerning the use of a predetermined
distribution system for AFTN messages.
11 December 1972
11 April 1973
16 August 1973
Fourth Meeting of the
Automated Data Interchange
Systems Panel
Insertion of cross-references in Volume I, Part I, Chapter 4, 4.12 and 17 June 1974
in the Introduction to Volume 11, concerning data exchange rates. -
ASIA/PAC RAN Meeting Amendments concerning the maintenance of guard on the VHF
emergency frequency 121.5 MHz by the crews of aircraft crossing
designated areas, and the elimination of ocean station vessels from
those aeronautical stations with which radio contact should be
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