Master Plan 2009 - Sydney Airport

Glossary and Aviation Terminology
AIRCRAFT NOISE TERMS
Australian Noise Exposure Concept (ANEC)
A set of contours based on hypothetical aircraft operations at an airport in the future. In this master plan,
ANECs have been used to model the impact of the new generation of quieter aircraft such as the A380 and
B787. As ANEC maps are based on hypothetical assumptions and may not have been subject to review
or endorsement, they have no official status and cannot be used for land use planning purpose. An ANEC
however, can be turned into an ANEF.
Australian Noise Exposure Forecast (ANEF)
A set of contours showing forecast of future aircraft noise levels. The ANEF is fundamentally a tool for
land use planning, and is used in Australian Standard 2021-2000 to define areas where construction of
certain building types is “acceptable”, “conditionally acceptable” and “unacceptable”. At ANEF values
less than 20, all building types are considered “acceptable”, and hence 20 ANEF is the lowest-valued
contour generally shown on ANEF charts. ANEF maps are subject to review and endorsement by Airservices
Australia.
Australian Noise Exposure Index (ANEI)
A set of contours calculated using ANEF techniques and based on historical data that shows the average
noise exposure for a given period such as a year. Airservices Australia publishes the quarterly and annual
ANEI for Sydney Airport.
Flight path movement maps
These maps provide an indication of where aircraft fly and how many overflights there are over a particular
period.
N70 contours
These are one of a number of alternative noise descriptors. N70 refers to the number of noise events louder
than 70 dB(A) over a particular period. The level of 70 dB(A) has been chosen because it is equivalent to the
single event level of 60 dB(A) specified in the Australian Standard AS2021-2000 as the indoor design sound
level for normal domestic areas in dwellings. An external single event noise level will be attenuated by
approximately 10 dB(A) by the fabric of a house with the windows open. An internal noise level of 60 dB(A)
is likely to interfere with conversation or with listening to radio or television. Airservices Australia publish
regular N70 contour charts which will be able to be compared to the chart shown in the master plan.
Respite
A respite hour is a whole clock hour where there are no aircraft movements over a particular area in that
hour.
SODPROPS
Simultaneous opposite direction parallel runway operations.
A noise sharing procedure where aircraft depart and arrive over Botany Bay. Runway 16L is used for
departures and Runway 34L is used for arrivals. This can only be operated in good weather conditions with
low winds.
AIRFIEld TERMS
Aprons
Aprons are defined areas for the safe parking of aircraft. The transfer of passengers and freight between
aircraft and terminal facilities as well as servicing and maintenance of aircraft in between flights takes place
on aprons.
Stand
Physical location of an aircraft parking position for either passenger or cargo aircraft.
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