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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 altitude/height (DA/H) 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 altitude/height (DA/H); and
d) landing in non-precision approach and landing
operations, expressed in terms of visibility and/or
runway visual range, minimum descent altitude/height
(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.
Aircraft. 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.
Aircraft operating manual. A manual, acceptable to the State
of the Operator, containing normal, abnormal and
emergency procedures, checklists, limitations, performance
information, details of the aircraft systems and other
material relevant to the operation of the aircraft.
Note.— The aircraft operating manual is part of the
operations manual.
Air operator certificate (AOC). A certificate authorizing an
operator to carry out specified commercial air transport
operations.
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.
ETOPS en-route alternate. A suitable and appropriate
alternate aerodrome at which an aeroplane would be
able to land after experiencing an engine shutdown or
other abnormal or emergency condition while en route
in an ETOPS operation.
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.
Altimetry system error (ASE). The difference between the
altitude indicated by the altimeter display, assuming a
correct altimeter barometric setting, and the pressure altitude
corresponding to the undisturbed ambient pressure.
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.
24/11/05
No. 29
Annex 6 — Operation of Aircraft Part I
1/11/01 1-2
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.
Precision approach 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.
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
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