Glossary of Terms


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T

TAA

Terminal arrival altitude (TAA). The lowest altitude that will provide a minimum clearance of 300 m (1 000 ft) above all
objects located in an arc of a circle defined by a 46 km (25 NM) radius centred on the initial approach fix (IAF), or where
there is no IAF on the intermediate approach fix (IF), delimited by straight lines joining the extremity of the arc to the IF.
The combined TAAs associated with an approach procedure shall account for an area of 360 degrees around the IF.


Take-off Power

Power definitions applicable to engines for aeroplanes and helicopters

‘Take-off Power’ means the output shaft power identified in the performance data for use during
take-off, discontinued approach and baulked landing and limited in use to a continuous period of
not more than 5 minutes,


Take-off Power Rating

Power definitions applicable to engines for aeroplanes and helicopters

‘Take-off Power Rating’ means the test bed minimum acceptance output shaft power as stated
in the engine type certificate data sheet, of series and newly overhauled engines when running
at the declared maximum coolantlcylinder head temperatures and within the appropriate
acceptance limitations.


Take-off safety speed

“Take-off safety speed’ (V2) means a referenced airspeed obtained after lift-off at which the required
one-engine-inoperative climb performance can be achieved.


Target level of safety (TLS)

“target level of safety (TLS)“ means a generic term representing the level of risk
which is considered acceptable in particular circumstances


Taxi/ground idle

Taxi/ground idle. The operating phases involving taxi and idle between the initial starting of the propulsion engine(s) and the
initiation of the take-off roll and between the time of runway turn-off and final shutdown of all propulsion engine(s).


Taxiing Taxying

“taxiing” means the movement of an aircraft on the surface of an aerodrome under its own
power, excluding take-off and landing, and in the case of helicopters including air-taxiing,
that is, operation over the surface of an aerodrome within a height band associated with
ground effect and at speeds associated with taxiing


Taxiway

“taxiway” means a defined path on a land aerodrome established for the taxiing of aircraft
and intended to provide a link between one part of the aerodrome and another including
rapid exit taxiway, that is, a taxiway connected to a runway at an acute angle and designed
to allow landing aeroplanes to turn off at higher speeds than are achieved on other exit
taxiways.

A defined path on a land aerodrome established for the taxiing of aircraft and intended to provide a link between one
part of the aerodrome and another, including:


a) Aircraft stand taxilane. A portion of an apron designated as a taxiway and intended to provide access to aircraft stands
only.


b) Apron taxiway. A portion of a taxiway system located on an apron and intended to provide a through taxi route across
the apron.


c) Rapid exit taxiway. A taxiway connected to a runway at an acute angle and designed to allow landing aeroplanes to
turn off at higher speeds than are achieved on other exit taxiways thereby minimizing runway occupancy times.


TCAC

Tropical cyclone advisory centre (TCAC). A meteorological centre designated by regional air navigation agreement to
provide advisory information to meteorological watch offices, world area forecast centres and international OPMET
databanks regarding the position, forecast direction and speed of movement, central pressure and maximum surface wind
of tropical cyclones.


TDM

Time division multiplex (TDM). A channel sharing strategy in which packets of information from the same source but with
different destinations are sequenced in time on the same channel.



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