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Note 1.— The terms “strayed aircraft” and “unidentified
aircraft” in this paragraph have the following meanings:
Strayed aircraft. An aircraft which has deviated significantly
from its intended track or which reports that it is lost.
Unidentified aircraft. An aircraft which has been observed
or reported to be operating in a given area but whose identity
has not been established.
Note 2.— An aircraft may be considered, at the same time,
as a “strayed aircraft” by one unit and as an “unidentified
aircraft” by another unit.
2.23.1.1 As soon as an air traffic services unit becomes
aware of a strayed aircraft it shall take all necessary steps as
outlined in 2.23.1.1.1 and 2.23.1.1.2 to assist the aircraft and
to safeguard its flight.
Note.— Navigational assistance by an air traffic services
unit is particularly important if the unit becomes aware of an
aircraft straying, or about to stray, into an area where there
is a risk of interception or other hazard to its safety.
2.23.1.1.1 If the aircraft’s position is not known, the air
traffic services unit shall:
a) attempt to establish two-way communication with the
aircraft, unless such communication already exists;
b) use all available means to determine its position;
c) inform other ATS units into whose area the aircraft may
have strayed or may stray, taking into account all the
factors which may have affected the navigation of the
aircraft in the circumstances;
d) inform, in accordance with locally agreed procedures,
appropriate military units and provide them with
pertinent flight plan and other data concerning strayed
aircraft;
e) request from the units referred to in c) and d) and from
other aircraft in flight every assistance in establishing
communication with the aircraft and determining its
position.
Note.— The requirements in d) and e) apply also to ATS
units informed in accordance with c).
27/11/03
No. 42
Annex 11 — Air Traffic Services Chapter 2
1/11/01 2-10
2.23.1.1.2 When the aircraft’s position is established, the
air traffic services unit shall:
a) advise the aircraft of its position and corrective action to
be taken; and
b) provide, as necessary, other ATS units and appropriate
military units with relevant information concerning the
strayed aircraft and any advice given to that aircraft.
2.23.1.2 As soon as an air traffic services unit becomes
aware of an unidentified aircraft in its area, it shall endeavour
to establish the identity of the aircraft whenever this is
necessary for the provision of air traffic services or required by
the appropriate military authorities in accordance with locally
agreed procedures. To this end, the air traffic services unit
shall take such of the following steps as are appropriate in the
circumstances:
a) attempt to establish two-way communication with the
aircraft;
b) inquire of other air traffic services units within the flight
information region about the flight and request their
assistance in establishing two-way communication with
the aircraft;
c) inquire of air traffic services units serving the adjacent
flight information regions about the flight and request
their assistance in establishing two-way communication
with the aircraft;
d) attempt to obtain information from other aircraft in the
area.
2.23.1.2.1 The air traffic services unit shall, as necessary,
inform the appropriate military unit as soon as the identity of
the aircraft has been established.
2.23.2 Interception of civil aircraft
2.23.2.1 As soon as an air traffic services unit learns that
an aircraft is being intercepted in its area of responsibility, it
shall take such of the following steps as are appropriate in the
circumstances:
a) attempt to establish two-way communication with the
intercepted aircraft via any means available, including
the emergency radio frequency 121.5 MHz, unless such
communication already exists;
b) inform the pilot of the intercepted aircraft of the
interception;
c) establish contact with the intercept control unit
maintaining two-way communication with the intercepting
aircraft and provide it with available information
concerning the aircraft;
d) relay messages between the intercepting aircraft or the
intercept control unit and the intercepted aircraft, as
necessary;
e) in close coordination with the intercept control unit take
all necessary steps to ensure the safety of the intercepted
aircraft;
f) inform ATS units serving adjacent flight information
　
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