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45 Sixth Meeting of the Panel of
Teletypewriter Specialists;
Fourth AN Conference
A number of detailed changes in the AFTN procedures; amendment
to Chapters 5 and 6, to indicate more precisely the procedures to be
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.
12 December 1966
12 April 1967
24 August 1967
46 Fifth Meeting of the ATC
Automation Panel
Provisions for the transmission of ATS messages intended for use in
an ATC computer.
7 June 1967
5 October 1967
8 February 1968
47 COM/OPS Divisional
Meeting
Introduction of new simplified Aeronautical Mobile Distress
Procedures which are better suited to the special requirements of
international civil aviation.
11 December 1967
11 April 1968
22 August 1968
48 Seventh Meeting of the Panel
of Teletypewriter Specialists
Introduction of changes to message classification and teletypewriter
procedures in the light of experience gained in automated operation of
the AFTN.
23 January 1969
23 May 1969
18 September 1969
49 First Meeting of the Automated
Data Interchange Systems
Panel; Sixth AN Conference
Provision concerning the use of the 7-unit code for data interchange
at medium signalling rates; introduction of provisions relating to the
categories of aeronautical mobile service messages. On the basis of
the study of consolidation and presentation of the Regional Supplementary
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.
1 June 1970
1 October 1970
4 February 1971
27/11/03
No. 78
Annex 10 — Aeronautical Telecommunications Volume II
1/11/01 (x)
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 long-term
retention of AFTN traffic records and the period of thirty days for the
retention of communications logs; expansion of the Introduction to
Volume II with material relating to the 7-unit coded character set;
introduction of the definitions for “ATS direct speech circuit”,
“Meteorological operational channel” and “Meteorological
operational telecommunication network”; reorganization 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
51 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
52 — No change. —
53 — No change. —
541 Fourth Meeting of the
Automated Data Interchange
Systems Panel
Insertion of cross-references in Volume I, Part I, Chapter 4, 4.12 and
in the Introduction to Volume II, concerning data exchange rates.
17 June 1974
——
55 — No change. —
56 — No change. —
57 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
attempted in case of air-ground communications failure.
16 June 1976
16 October 1976
6 October 1977
58 Sixth Meeting of the
　
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