422 / 476
412
6 – i ndex
IndependentParallelDepartures:
Simultaneous departures in the
samedirection fromparallel or near-parallel instrument runways.
InertialNavigation / ReferenceSystem (INS/IRS):
A self-contained
navigation system that continuallymeasures the accelerations acting
upon the vehicleofwhich it is part. Suitably integrated, these forces
provide velocity and thenceposition information.
InstrumentApproachand LandingOperations:
Instrument
approach and landingoperations are classified as follows:
• Non-precisionApproachand LandingOperations: Instrument
approaches and landingswhichdonot utilise electronic glidepath
guidance.
• PrecisionApproach and LandingOperations: Instrument
approaches and landings usingprecision azimuth andglide
pathguidancewithminima as determinedby the categoryof
operation.
Categories of PrecisionApproach and LandingOperations are:
- Category I (CAT I) operation. Aprecision instrument approach
and landingwith adecisionheight not lower than200 ft and a
visibilitynot less than 800m, or aRVRnot less than 550m.
- Category II (CAT II) operation: Aprecision instrument approach
and landingwith adecisionheight lower than 200 ft but not
lower than 100 ft, and a runwayvisual rangenot less than 350m.
- Category IIIA (CAT IIIA) operation: Aprecision instrument
approach and landingwith adecisionheight lower than100 ft,
or nodecisionheight and a runway visual rangenot less than
200m.
- Category IIIB (CAT IIIB) operation: Aprecision instrument
approach and landingwith either, adecisionheight lower than
50 ft, orwithnodecisionheight and a runway visual range less
than 200mbut not less than 50m.
- Category IIIC (CAT IIIC) operation: Aprecision instrument
approach and landingwithnodecisionheight andno runway
visual range limitations.
InstrumentApproachProcedure:
A series of predetermined
manoeuvres by reference toflight instrumentswith specifiedprotection
fromobstacles from the initial approachfixorwhere applicable, from
thebeginningof adefined arrival route toapoint fromwhich a landing
definitions