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procedures. Standard radiotelephony phraseology shall be used
and the correct setting of transponder codes shall be ensured at
all times.
8.5.2 SSR Code management
8.5.2.1 Codes 7700, 7600 and 7500 shall be reserved
internationally for use by pilots encountering a state of emergency,
radiocommunication failure or unlawful interference,
respectively.
8.5.2.2 SSR Codes are to be allocated and assigned in
accordance with the following principles.
8.5.2.2.1 Codes should be allocated to States or areas in
accordance with regional air navigation agreements, taking
into account overlapping radar coverage over adjacent
airspaces.
8.5.2.2.2 The appropriate ATS authority shall establish a
plan and procedures for the allocation of codes to ATS units.
8.5.2.2.3 The plan and procedures should be compatible
with those practised in adjacent States.
8.5.2.2.4 The allocation of a code should preclude the
use of this code for any other function within the area of
coverage of the same SSR for a prescribed time period.
8.5.2.2.5 To reduce pilot and controller workload and the
need for controller/pilot communications, the number of code
changes required of the pilot should be kept to the minimum.
8.5.2.2.6 Codes shall be assigned to aircraft in
accordance with the plan and procedures laid down by the
appropriate ATS authority.
8.5.2.2.7 Where there is a need for individual aircraft
identification, each aircraft shall be assigned a discrete code
which should, whenever possible, be retained throughout the
flight.
8.5.2.3 SSR Codes shall be reserved, as necessary, for
exclusive use by medical aircraft operating in areas of
international armed conflict. SSR Codes shall be allocated by
ICAO through its Regional Offices in coordination with States
concerned and should be assigned to aircraft for use within the
area of conflict.
Note.— The term “medical aircraft” refers to aircraft
protected under the Geneva Conventions of 1949 and under
the Protocol Additional to the Geneva Conventions of
12 August 1949, and relating to the protection of victims
of international armed conflicts (Protocol I).
8.5.3 Operation of SSR transponders
Note.— SSR transponder operating procedures are
contained in Procedures for Air Navigation Services —
Aircraft Operations (PANS-OPS, Doc 8168), Volume I,
Part VIII.
8.5.3.1 When, after a pilot has been directed to operate
the aircraft’s transponder on an assigned code, or to effect a
code change, it is observed that the code shown on the radar
display is different from that assigned to the aircraft, the pilot
shall be requested to reselect the assigned code.
8.5.3.2 Whenever it is observed that the code of an
aircraft as shown on the radar display, or aircraft identification
where code/call sign conversion is effected, is different from
that assigned to the aircraft and the application of the procedure
described in 8.5.3.1 has not resolved this discrepancy
or is not warranted by circumstances (e.g. unlawful interference),
the pilot shall be requested to confirm the correct
code has been selected.
8.5.3.3 If the discrepancy still persists, the pilot may be
requested to stop the operation of the aircraft’s transponder.
The next control position and any other affected unit using
SSR in the provision of ATS shall be informed accordingly.
8.5.3.4 Aircraft equipped with Mode S having an aircraft
identification feature shall transmit the aircraft identification
as specified in Item 7 of the ICAO flight plan or, when no
flight plan has been filed, the aircraft registration.
Note.— All Mode S-equipped aircraft engaged in international
civil aviation are required to have an aircraft
identification feature (Annex 10, Volume IV, Chapter 2, 2.1.5.2
refers).
8-4 Air Traffic Management (PANS-ATM)
1/11/01
8.5.3.5 Whenever it is observed on the radar display that
the aircraft identification transmitted by a Mode S-equipped
aircraft is different from that expected from the aircraft, the
pilot shall be requested to reselect aircraft identification.
8.5.3.6 If, following confirmation by the pilot that the
correct aircraft identification has been set on the Mode S
identification feature, the discrepancy continues to exist, the
following actions shall be taken by the controller:
a) inform the pilot of the persistent discrepancy;
b) where possible, rectify the radar label showing the
aircraft identification on the radar display; and
c) notify the erroneous identification transmitted by the
aircraft to the next control position and any other
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