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b) the current level (pressure-altitude);
c) the forecast time of penetration of 18 000 m (60 000 ft)
pressure-altitude, if applicable;
d) the forecast time and location of ground impact.
6.5 The operator of a heavy or medium unmanned free
balloon shall notify the appropriate air traffic services unit
when the operation is ended.
ANNEX 2 37 14/11/91
ATTACHMENT A. INTERCEPTION OF CIVIL AIRCRAFT
(Note.— See Chapter 3, 3.8 of the Annex and associated Note)
Note.— In the interest of completeness, the substance of the
provisions in Appendix 2 to the Annex is incorporated in this
Attachment.
1. In accordance with Article 3 d) of the Convention on
International Civil Aviation the Contracting States of ICAO
“undertake, when issuing regulations for their state aircraft,
that they will have due regard for the safety of navigation of
civil aircraft”. As interceptions of civil aircraft are, in all
cases, potentially hazardous, the Council of ICAO has
formulated the following special recommendations which
Contracting States are urged to implement through appropriate
regulatory and administrative action. The uniform
application by all concerned is considered essential in the
interest of safety of civil aircraft and their occupants. For this
reason the Council of ICAO invites Contracting States to
notify ICAO of any differences which may exist between
their national regulations or practices and the special
recommendations hereunder.
2. General
2.1 Interception of civil aircraft should be avoided and
should be undertaken only as a last resort. If undertaken, the
interception should be limited to determining the identity of
the aircraft, unless it is necessary to return the aircraft to its
planned track, direct it beyond the boundaries of national
airspace, guide it away from a prohibited, restricted or danger
area or instruct it to effect a landing at a designated aerodrome.
Practice interception of civil aircraft is not to be undertaken.
2.2 To eliminate or reduce the need for interception of
civil aircraft, it is important that:
a) all possible efforts be made by intercept control units to
secure identification of any aircraft which may be a civil
aircraft, and to issue any necessary instructions or
advice to such aircraft, through the appropriate air traffic
services units. To this end, it is essential that means of
rapid and reliable communications between intercept
control units and air traffic services units be established
and that agreements be formulated concerning
exchanges of information between such units on the
movements of civil aircraft, in accordance with the
provisions of Annex 11;
b) areas prohibited to all civil flights and areas in which
civil flight is not permitted without special authorization
by the State be clearly promulgated in aeronautical
information publications (AIP) in accordance with the
provisions of Annex 15, together with the risk, if any, of
interception in the event of penetration of such areas.
When delineating such areas in close proximity to
promulgated ATS routes, or other frequently used
tracks, States should take into account the availability
and over-all systems accuracy of the navigation systems
to be used by civil aircraft and their ability to remain
clear of the delineated areas;
c) the establishment of additional navigation aids be
considered where necessary to ensure that civil aircraft
are able safely to circumnavigate prohibited or, as
required, restricted areas.
2.3 To eliminate or reduce the hazards inherent in
interceptions undertaken as a last resort, all possible efforts
should be made to ensure co-ordinated actions by the pilots
and ground units concerned. To this end, it is essential that
Contracting States take steps to ensure that:
a) all pilots of civil aircraft be made fully aware of the
actions to be taken by them and the visual signals to be
used, as specified in Chapter 3 and Appendix 1 of this
Annex;
b) operators or pilots-in-command of civil aircraft
implement the provisions in Annex 6, Parts I, II and III
regarding the capability of aircraft to communicate on
121.5 MHz and the availability of interception
procedures and visual signals on board aircraft;
c) all air traffic services personnel be made fully aware of
the actions to be taken by them in accordance with the
provisions of Annex 11, Chapter 2 and the PANS-ATM
(Doc 4444);
d) all pilots-in-command of intercepting aircraft be made
aware of the general performance limitations of civil
aircraft and of the possibility that intercepted civil
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