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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.
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 5.3.1 above 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.
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.
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 inter-national civil aviation are required to have an aircraft identification feature (Annex 10, Volume IV, Chapter 2, 2.1.5.2 refers).
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.
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 interested unit using Mode S for identification purposes.
5.4 Level information based on the use of Mode C

5.4.1  Verification of accuracy of Mode C-derived level information
5.4.1.1 The tolerance value used to determine that Mode C-derived level information displayed to the controller is accurate shall be ±90 m (±300 ft).
5.4.1.2 Verification of the accuracy of Mode C-derived level information displayed to the controller shall be effected at least once by each suitably equipped ATC unit on initial contact with the aircraft concerned or, if this is not feasible, as soon as possible thereafter. The verification shall be effected by simultaneous comparison with altimeter-derived level information received from the same aircraft by radio-telephony. The pilot of the aircraft whose Mode C-derived level information is within the approved tolerance value need not be advised of such verification.
7/11/96
5.4.1.3 If the displayed level information is not within the approved tolerance value or when a discrepancy in excess of the approved tolerance value is detected subsequent to verification, the pilot shall be advised accordingly and requested to check the pressure setting and confirm the aircraft’s level.
5.4.1.4 If, following confirmation of the correct pressure setting the discrepancy continues to exist, the following action should be taken according to circumstances:
a)  request the pilot to stop Mode C transmission, provided this does not interrupt the operation of the transponder on Mode A and notify the next control positions or ATC unit concerned with the aircraft of the action taken; or
b)  inform the pilot of the discrepancy and request that Mode C operation continue in order to prevent loss of position and identity information on the aircraft and notify the next control position or ATC unit concerned with the aircraft of the action taken.
　
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