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services. Following are the main elements to be considered fur
contingency planning depending upon circumstances:
a) re-routing of traffic to avoid the whole or part of the
airspace concerned, normally involving establishment of
additional routes or route segments with associated
conditions for their use;
b) establishment of a simplified route network through the
airspace concerned, if it is available, together with a
flight level allocation scheme to ensure lateral and
vertical separation, and a procedure for adjacent area
control centres to establish longitudinal separation at the
entry point and to maintain such separation through the
airspace;
C) reassignment of responsibility for providing air trafftc
services in airspace over the high seas or in delegated
airspace;
d) provision and operation of adequate air-ground
communications, AFTN and ATS direct speech links,
including reassignment, to adjacent States, of the
responsibility for providing meteorological information
and information on status of navigation aids;
section should include agreeme,nt on a detailed, common e) special arrangements for collecting. and disseminating
NOTAM text to be promulgated at a commonly agreed effective in-flight and post-flight reports from aircraft;
date.
6. Development, promulgation and
application of contingency plans
6.1 Development of a sound contingency plan is
dependent upon circumstances. including the availability, or
not, of the airspacc 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 thc 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 trafftc 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 arc
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 sircraft to maint at' n 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 he conducted in accordance with EX, 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
sn~eillance and communications capability of adjacent air routes in thc area.
traffic services units, volume and types of aircraft to bc
accommodated and the actual status of the air traffic services, 6.3 Notification, by NOTAM, of anticipated or actual
cornmunications, meteorological and aeronautical information disruption of air traffic services and/or related supporting
ATT D-3 2711 1103
Nu. 42
Annex 11 -Air Traffic Services Astachmetat C
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 -
ATT D-4

COVER SHEET TO AMENDMENT 43
INTERNATIONAL STANDARDS
　
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