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6 – i ndex
Note: There are three categories of significant points: ground-
basednavigation aid, intersection andwaypoint. In the
context of this definition, intersection is a significant point
expressedas radials, bearings and/or distances from
ground-basednavigation aids.
SignificantWeather:
Anyweather phenomenonwhichmight affect
flight visibilityor present ahazard to an aircraft.
SimultaneousOppositeDirectionParallelRunway
Operations (SODPROPS):
A conditionwhereby arriving aircraftwill
approach and landonone runway, concurrentwithaircraft departures
from theparallel runwayusing theoppositedirection to that being
used for approach and landing.
SituationDisplay:
An electronic displaydepicting thepositionand
movement of aircraft andother information as required.
SoleMeansNavigationSystem:
Anavigation system that, for
agivenphaseof flight,must allow the aircraft tomeet all four
navigation systemperformance requirements - accuracy, integrity,
availability and continuityof service.
SSRCode:
Thenumber assigned to aparticularmultiple-pulse reply
signal transmittedby a transponder inModeAorModeC.
Standard InstrumentArrival (STAR):
Adesignated IFRarrival
route linking a significant point, normallyon anATS route, witha
point fromwhichapublished instrument approachprocedure canbe
commenced.
Standard InstrumentDeparture (SID):
Adesignated IFR
departure route linking the aerodromeor a specified runwayof the
aerodromewitha specified significant point, normallyon adesignated
ATS route, atwhich the en routephaseof aflight commences.
StandardPressure:
Thepressureof 1013.2Hectopascalswhich, if
set upon thepressure sub-scaleof a sensitivealtimeter, will cause the
latter to read zerowhen atmean sea level ina standardatmosphere.
StandardPressureRegion:
Airspace above10 000 ftwhere the
sub-scaleof apressure sensitive altimeter is set to1013.2HPa.
definitions