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revised parameter listings; introduction of two-hour duration CVRs; 1 November 2001
b) amendment of the classification of instrument approach and landing
operations;
C) new provisions pertaining to approach with vertical guidance (APV)
operations; and
d) new definitions and update of provisions pertaining to
maintenance-related requirements.
Revised requirements for the ground proximity warning system (GPWS) and
forward looking terrain avoidance function.
Authorization by the State of Registry for operations in RNP airspace.
a) New definitions and provisions regarding height-keeping performance
and height-monitoring requirements associated with reduced vertical
separation minimum (RVSM) operations; and
15 March 2002
15 July 2002
28 November 2002
13 March 2003
14 July 2003
27 November 2003
28 February 2005
I1 July 2005
24 November 2005
b) new requirements for the carriage of airborne collision avoidance systems
(ACAS 11) in general aviation aeroplanes, and associated training
requirements for pilots.
(xiii) 2411 1/05
No. 24
INTERNATIONAL STANDARDS
AND RECOMMENDED PRACTICES
CHAPTER 1. DEFINITIONS
When the following terms are used in the Standards, Take-off alternate. An alternate aerodrome at which an
Recommended Practices and Definitions for the operation of aircraft can land should this become necessary shortly
aeroplanes in international general aviation, they have the after take-off and it is not possible to use the aerodrome
following meanings: of departure.
A e ~wlor k. An aircraft operation in which an aircraft is used
for specialized services such as agriculture, construction,
photography, surveying, observation and patrol, search and
rescue, aerial advertisement, etc.
Aerodrome. A defined area on land or water (including any
buildings, installations and equipment) intended to be used
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 @A/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 altitudeheight O M ) ; and
d) landing in non-precision approach and landing operations,
expressed in terms of visibility andlor runway
visual range, minimum descent altitudeheight (MDM)
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.
Aircrrrfr. 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:
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 j7ight.
A h e t r y 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 apprwch
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.
Precision approach and landing operations. An instrument
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