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either wholly or in part for the arrival, departure and
surface movement of aircraft.
Aerodrome operating minima. The limits of usability of an
aerodrome for:
a) take-off, expressed in terms of runway visual range
and/or visibility and, if necessary, cloud conditions;
b) landing in precision approach and landing operations,
expressed in terms of visibility and/or runway visual
range and decision altitudeheight (DAM) as appropriate
to the category of the operation;
C) landing in approach and landing operations with vertical
guidance, expressed in terms of visibility and/or runway
visual range and decision altitudeheight (DAM); and
d) landing in non-precision approach and landing operations,
expressed in terms of visibility and/or runway
visual range, minimum descent altitudeheight (MDA/H)
and, if necessary, cloud conditions.
Aeroplane. A power-driven heavier-than-air aircraft, deriving
its lift in flight chiefly from aerodynamic reactions on
surfaces which remain fixed under given conditions of
flight.
Aircrafl. Any machine that can derive support in the
atmosphere from the reactions of the air other than the
reactions of the air against the earth's surface.
Alternate aerodrome. An aerodrome to which an aircraft may
proceed when it becomes either impossible or inadvisable
to proceed to or to land at the aerodrome of intended
landing. Alternate aerodromes include the following:
Take-off alternate. An alternate aerodrome at which an
aircraft can land should this become necessary shortly
after take-off and it is not possible to use the aerodrome
of departure.
En-route alternate. An aerodrome at which an aircraft would
be able to land after experiencing an abnormal or
emergency condition while en route.
Destination alternate. An alternate aerodrome to which an
aircraft may proceed should it become either impossible
or inadvisable to land at the aerodrome of intended
landing.
Note.- The aerodrome from which a flight departs may
also be an en-route or a destination alternate aerodrome for
that flight.
Approach and landing operations using instrument approach
procedures. Instrument approach and landing operations
are classified as follows:
Non-precision approach and landing operations. An
instrument approach and landing which utilizes lateral
guidance but does not utilize vertical guidance.
Approach and landing operations with vertical guidance.
An instrument approach and landing which utilizes
lateral and vertical guidance but does not meet the
requirements established for precision approach and
landing operations.
~recis'ionap proach and landing operations. An instrument
approach and landing using precision lateral and vertical
guidance with minima as determined by the category of
operation.
Note.- Lateral and vertical guidance refers to the
guidance provided either by:
a) a ground-based navigation aid; or
b) computer generated navigation data.
Categories of precision approach and landing operations:
Category I (CAT I) operation. A precision instrument
approach and landing with a decision height not lower
than 60 m (200 ft) and with either a visibility not less than
800 m or a runway visual range not less than 550 m.
ANNEX 6 - PART I1 l/llml
No. 21
Annex 6 - Operation of Aircraft Part ZZ
Category II (CAT II) operation. A precision instrument
approach and landing with a decision height lower than
60 m (200 ft), but not lower than 30 m (100 ft), and a
runway visual range not less than 350 m.
Category IIIA (CAT IIIA) operation. A precision instrument
approach and landing with:
a) a decision height lower than 30 m (100 ft) or no
decision height; and
b) a runway visual range not less than 200 m.
Category IIIB (CAT IIIB) operation. A precision instrument
approach and landing with:
a) a decision height lower than 15 m (50 ft) or no
decision height; and
b) a runway visual range less than 200 m but not less
than 50 m.
Category IIIC (CAT IIIC) operation. A precision instrument
approach and landing with no decision height and no
runway visual range limitations.
Note.- Where decision height (DH) and runway visual
range (RVR) fall into different categories of operation, the
instrument approach and landing operation would be
conducted in accordance with the requirements of the most
demanding category (e.g. an operation-with a DH in the range
of CAT IIIA but with an RVR in the range of CAT IIIB would
be considered a CAT IIIB operation or an operation with a
DH in the range of CAT II but with an RVR in the range of
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