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not, of the airspace affected by the disruptive circumstances
for use by international civil aviation operations. Sovereign
airspace can be used only on the initiative of, or with the
agreement or consent of, the authorities of the State concerned
regarding such use. Otherwise, the contingency arrangements
must involve bypassing the airspace and should be developed
by adjacent States or by ICAO in cooperation with such
adjacent States. In the case of airspace over the high seas or of
undetermined sovereignty, development of the contingency
plan might involve, depending upon circumstances, including
the degree of erosion of the alternative services offered,
temporary reassignment by ICAO of the responsibility for
providing air traffic services in the airspace concerned.
f) a requirement for aircraft to maintain continuous
listening watch on a specified pilot-pilot VHF frequency
in specified areas where air-ground communications are
uncertain or non-existent and to broadcast on that
frequency, preferably in English, position information
and estimates, including start and completion of climb
and descent;
g) a requirement for all aircraft in specified areas to display
navigation and anti-collision lights at all times;
h) a requirement and procedures for aircraft to maintain an
increased longitudinal separation that may be established
between aircraft at the same cruising level;
i) a requirement for climbing and descending well to the
right of the centre line of specifically identified routes;
j) establishment of arrangements for controlled access to
the contingency area to prevent overloading of the
contingency system; and
6.2 Development of a contingency plan presupposes as k) a requirement for all operations in the contingency area
much information as possible on current and alternative routes, to be conducted in accordance with FR, including
navigational capability of aircraft and availability or partial allocation of FR flight levels, from the relevant Table of
availability of navigational guidance from ground-based aids, Cruising Levels in Appendix 3 of Annex 2, to ATS
surveillance and communications capability of adjacent air routes in the area.
traffic services units, volume and types of aircraft to be
accommodated and the actual status of the air traffic services, 6.3 Notification, by NOTAM, of anticipated or actual
communications, meteorological and aeronautical information disruption of air traffic services andlor related supporting
ATT D-3
Annex 11 -Air Trafic Services Attachment D
services should be dispatched to users of air navigation 6.4 Notification by NOTAM of discontinuance of
services as early as practicable. The NOTAM should include contingency measures and reactivation of the services set forth
the associated contingency arrangements. In the case of in the regional air navigation plan should be dispatched as
foreseeable disruption, the advance notice should in any case early as practicable to ensure an orderly transfer from
not be less than 48 hours. contingency conditions to normal conditions.
- END -
2711 1103
No. 42
ATT D-4

Transmittnl Note
SUPPLEMENT TO
ANNEX 11 - AIR TRAFFIC SERVICES
(Thirteenth Edition)
1. The attached Supplement supersedes all previous Supplements to Annex 11 and includes differences notified by
Contracting States up to 3 1 December 2003 with respect to a11 amendments up to and including Amendment 42.
2. This Supplement should be inserted at the end of Annex 11, Thirteenth Edition. Additional differences and
revised comments received from Contracting States will be issued at intervals as amendments to this Supplement.
SUPPLEMENT TO ANNEX 11 - THIRTEENTH EDITION
AIR TRAFFIC SERVICES
Differences between the national regulations and practices of Contracting States
and the corresponding International Standards and Recommended Practices
contained in Annex 11, as notified to ICAO in accordance with Article 38 of the
Convention on International Civil Aviation and the Council's resolution of
2 1 November 1950.
DECEMBER 2003
-- -- -
INTERNATIONAL CIVIL AVIATION ORGANIZATION
(ii) SUPPLEMENTOT A NNEX 11 (THIRTEENETDHT ITON)
RECORD OF AMENDMENTS TO SUPPLEMENT
No.
AMENDMENTS TO ANNEX 11 ADOPTED OR APPROVED BY THE COUNCIL
SUBSEQUENT TO THE THIRTEENTH EDITION ISSUED JULY 2001
Date Entered by 1 No. Date Entered by
SUPPLEMENTOT A NNEX1 1 (THIRTEENETDHI TION) (iii)
1. Contracting States which have notified ICAO of differences
The Contracting States listed below have notified ICAO of differences which exist between their national regulations
and practices and the International Standards and Recommended Practices of Annex 11, Thirteenth Edition, up to and
　
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