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interested unit using Mode S for identification purposes.
8.5.4 Level information based on
the use of Mode C
8.5.4.1 VERIFICATION OF ACCURACY
OF MODE C-DERIVED LEVEL INFORMATION
8.5.4.1.1 The tolerance value used to determine that
Mode C-derived level information displayed to the controller
is accurate shall be ±90 m (±300 ft).
8.5.4.1.2 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 altimeterderived
level information received from the same aircraft by
radiotelephony. The pilot of the aircraft whose Mode
C-derived level information is within the approved tolerance
value need not be advised of such verification.
8.5.4.1.3 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.
8.5.4.1.4 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.
8.5.4.2 DETERMINATION OF LEVEL OCCUPANCY
8.5.4.2.1 The criterion which shall be used to determine
that a specific level is occupied by an aircraft shall be ±90 m
(±300 ft), except that appropriate ATS authorities may specify
a smaller criterion but not less than ±60 m (±200 ft) if this is
found to be more practical.
Note.— For a brief explanation of the considerations
underlying this value see the Air Traffic Services Planning
Manual (Doc 9426).
8.5.4.2.2 Aircraft maintaining a level. An aircraft is
considered to be maintaining its assigned level as long as the
SSR Mode C-derived level information indicates that it is
within ±90 m (±300 ft) of the assigned level.
8.5.4.2.3 Aircraft vacating a level. An aircraft cleared to
leave a level is considered to have commenced its manoeuvre
and vacated the previously occupied level when the SSR Mode
C-derived level information indicates a change of more than
90 m (300 ft) in the anticipated direction from its previously
assigned level.
8.5.4.2.4 Aircraft passing a level in climb or descent. An
aircraft in climb or descent is considered to have crossed a
level when the SSR Mode C-derived level information
indicates that it has passed this level in the required direction
by more than 90 m (300 ft).
8.5.4.2.5 Aircraft reaching a level. An aircraft is considered
to have reached the level to which it has been cleared
when three consecutive renewals of Mode C-derived level
information have indicated that it is within 90 m (300 ft) of its
assigned level.
Note.— In automated ATS systems, the cycles of renewals
of Mode C data may not be evident to controllers. It may,
therefore, be necessary to specify in instructions to controllers
the number of display repetition cycles, or a time interval,
corresponding to three consecutive renewals of Mode C data.
Chapter 8. Radar Services 8-5
1/11/01
8.5.4.2.6 Intervention by a controller shall only be
required if differences in level information between that
displayed to the controller and that used for control purposes
are in excess of the values stated above.
8.6 GENERAL RADAR PROCEDURES
8.6.1 Performance checks
8.6.1.1 The radar controller shall adjust the radar
display(s) and carry out adequate checks on the accuracy
thereof, in accordance with the technical instructions prescribed
by the appropriate authority for the radar equipment
concerned.
8.6.1.2 The radar controller shall be satisfied that the
available functional capabilities of the radar system as well as
the information presented on the radar display(s) is adequate
for the functions to be performed.
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