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STANDARD PRESSURE
The pressure of 1013.2 hectopascals which, if set upon the pressure sub-scale of
a sensitive altimeter, will cause the latter to read zero when at mean sea level in a
standard atmosphere. This pressure must be set on the sub-scale of an altimeter
before the vertical displacement indicated by the altimeter is corrected to a true value
by applying the temperature correction.
356
Civil Aviation Safety Authority Australia
INDEX
09/2001
5 SECTION
DEFINITIONS
STOPWAY
A defined rectangular area on the ground at the end of a runway in the direction of
take-off designated and prepared by the Competent Authority as a suitable area in
which an aircraft can be stopped in the case of an interrupted take-off.
TAKE-OFF DISTANCE AVAILABLE (TODA)
The length of the take-off run available plus the length of clearway available.
TAKE-OFF RUN AVAILABLE (TORA)
The length of runway which is declared by the State to be available and suitable for
the ground run of an aeroplane taking-off. This in most cases corresponds to the
physical length of the runway pavement.
TAXI HOLDING POINT
A designated position on a taxiway, runway or channel at which taxiing aircraft may
be required to stop pending receipt of permission to proceed.
TAXIWAY (TWY)
A defined path on a land aerodrome, selected or prepared for the use of taxiing
aircraft.
Note: Caution, taxiways may also include a holding point.
TERRAIN CLEARANCE
The vertical displacement of an aircraft’s flight path from the terrain. Minimum
values are prescribed relative to the flight rules in force and the conditions
prevailing.
THRESHOLD (THR)
The beginning of that portion of the runway useable for landing.
TO ALERT
To warn to prepare for search and rescue and/or to direct the guarding of specified
radio frequencies.
TOTAL ESTIMATED ELAPSED TIME
For VFR flights the estimated time required from take-off to arrive over the
destination aerodrome.
TRACK
The projection on the earth’s surface of the path of an aircraft, the direction of
which path at any point is usually expressed in degrees from North (True, Magnetic
or Grid).
TRANSITION ALTITUDE
The altitude at or below which the vertical position of an aircraft
is controlled by reference to altitudes.
357
Civil Aviation Safety Authority Australia
INDEX
09/2001
5 SECTION
DEFINITIONS
TRANSITION LAYER
The airspace between the transition altitude and the transition level.
TRANSITION LEVEL (TRL)
The flight level at or above which the vertical position of an aircraft
is controlled by reference to flight levels.
UNDERSHOOT SHEAR
A wing shear occurrence which produces an INITIAL effect of undershooting the
desired approach path and/or decreasing air speed.
UNSERVICEABLE AREA
A portion of the movement area not available for use by aircraft because of the
physical condition of the surface, or because of any obstruction on the area.
VHF OMNI-DIRECTIONAL RADIO RANGE (VOR)
A VHF radio navigational aid which provides a continuous indication of magnetic
bearing from the selected VOR ground station.
VISUAL APPROACH SLOPE INDICATOR SYSTEM (VASIS)
A system of lights so arranged as to provide visual information to pilots of
approaching aircraft of their position in relation to the optimum approach slope
for a particular runway.
VISIBILITY (VIS)
The ability, as determined by atmospheric conditions and expressed in units of
distance, to see and identify prominent unit objects by day and prominent lit objects
by night.
Visibility is divided into two classes as follows:
Flight Visibility: The average range visibility forward from the cockpit of an
aircraft in flight.
Ground Visibility: The visibility at an aerodrome, as reported by and approved
observer.
358
Civil Aviation Safety Authority Australia
INDEX
09/2001
5 SECTION
DEFINITIONS
CODE DEFINITION A
A/A Air to Air
AACC Area Approach Control
Centre
AAD Assigned Altitude Deviation
AAL Above Aerodrome Level
ABM Abeam
ABN Aerodrome Beacon Information
Service
ABT About
ABV Above
AC Altocumulus
+ACAS Airborne Collision Avoidance
System
ACC Area Control Centre
ACCID Initial Notification of an Aircraft
Accident
ACD Airways Clearance Delivery
ACFT Aircraft
ACK Acknowledge Service
ACN Aircraft Classification Number
ACPT Accept, Accepted
Telecommunication
ACT Active, Activated, Activity
AD Aerodrome Zone(s)
ADC Aerodrome Chart
ADDGM Aerodrome Diagrams
　
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