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with the Compliance Administration Manual.
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GEN (GENERAL) A/L 45 effective 24 NOV 05
GEN 2. TABLES AND CODES
GEN 2.1 MEASURING SYSTEM, AIRCRAFT MARKINGS, HOLIDAYS
1. UNITS OF MEASUREMENT
1.1 Units of measurement to be used in airways operations and
air-ground communications are as follows:
Measurement Units
Distances used in navigation nautical miles and
(generally in excess of 2NM.) tenths *
Short distances metres
Altitudes, elevations and heights feet
Horizontal speed, including wind speed knots
Vertical speed feet per minute
Wind direction for runway operations degrees magnetic
Wind direction except for runway degrees true
operations
Visibility, including runway visual kilometres or
range metres
Altimeter setting hectopascals
Temperature degrees celsius
Weight (Mass) Metric tonnes or
kilograms
Time hours and minutes
* Miles must be read as meaning nautical miles unless otherwise
stated. The word “nautical” may be omitted from air-ground
communications.
1.1.1 An aircraft which is temporarily unable to use these units must so
advise and request the ground station to transmit in units useable
by the aircraft.
2. TIME SYSTEM
2.1 Coordinated Universal Time (UTC) is used for civil aviation.
2.2 Date and time is indicated in a combination of the date and time in
a single six figure group. However, a 10 figure group comprising
the year, month, date, hours and minutes is used for NOTAM and
SUPs. This is reduced to an eight figure group (nil year) for SPFIB.
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3. GEODETIC REFERENCE DATUM
3.1 All published geographical coordinates are expressed in term of
the World Geodetic System – 1984 (WGS-84). Most coordinates
have been surveyed; however, those coordinates that have been
mathematically derived are indicated by an asterisk.
3.2 Coordinates published in AIP documents/charts and NOTAM are
expressed in degrees, minutes and tenths of a minute with the
cardinal point placed first; eg, S32 46.3 E138 24.0. When more
accurate coordinate information is required (eg, the
commissioning of a new navigation aid) the more detailed set of
coordinates may be included in brackets. The Designated
Airspace Handbook (DAH) departs from this convention in that
coordinates are expressed in degrees, minutes and seconds, and,
if required, tenths/hundredths of a second with the cardinal point
last; eg, 05 07 21.2S 065 25 22.6E.
4. PUBLIC HOLIDAYS
4.1 National
New Year’s Day 1 January
Australia Day 26 January
Good Friday Friday before Easter
Easter Monday Monday after Easter Sunday
Anzac Day 25 April
Queen’s Birthday Usually second Monday in
June (except WA)
Christmas Day 25 December
Boxing Day 26 December
4.2 Some services may be affected on public holidays. Operators
should check NOTAM and/or contact the relevant aerodrome
owner/operator.
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GEN 2.2 DEFINITIONS AND ABBREVIATIONS
1. DEFINITIONS
Aerodrome: A defined area of land or water (including any buildings,
installations and equipment) intended to be used either wholly or in part for the
arrival, departure and movement of aircraft.
Aerodrome Beacon: An aeronautical beacon, used to indicate the location of
an aerodrome from the air.
Aerodrome Control Service: ATC service for aerodrome traffic.
Aerodrome Control Tower: A unit established to provide ATC service to
aerodrome traffic.
Aerodrome Elevation: The elevation of the highest point of the landing area.
Aerodrome Meteorological Minima (Ceiling and Visibility Minima): The
minimum heights of cloud base (ceiling) and minimum values of visibility which
are prescribed in pursuance of CAR 257 for the purpose of determining the
useability of an aerodrome either for take-off or landing.
Aerodrome Proprietor: Any Owner, Licensee, Authority, Corporation, or any
other body which has a legal responsibility for a particular aerodrome.
Aerodrome Reference Point (ARP): The designated geographical location
of an aerodrome.
Aerodrome Traffic: All traffic on the manoeuvring area of an aerodrome, and
all aircraft flying in the vicinity of an aerodrome.
Note: An aircraft is in the vicinity of an aerodrome when it is in, entering, or
leaving the traffic circuit.
Aerodrome Traffic Circuit: The specified path to be flown by aircraft
operating in the vicinity of an aerodrome.
Aeronautical Beacon: An aeronautical ground light visible at all azimuths,
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