Instrument Landing System

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  • Topic: Instrument landing system, Instrument approach, Radio navigation
  • Pages : 14 (4148 words )
  • Download(s) : 18
  • Published : May 22, 2011
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Instrument Landing System Operational Notes Contents

Disclaimer These notes are a reproduction of a booklet originally published by the Department of Aviation. Although these notes are no longer in print, they continue to provide a valuable resource and are made available as reference material for students, pilots and instructors. The notes have not been edited, and as they were written 20 or more years ago, may contain information relating to systems that are no longer in production or have been modernised. 1. 2. 3. Introduction ................................................................................................................................ 1-1 Basic Principles.......................................................................................................................... 2-1 Ground Equipment ..................................................................................................................... 3-1 3.1 Localiser ............................................................................................................................. 3-1 3.2 Glide Path ........................................................................................................................... 3-2 3.3 Marker Beacons.................................................................................................................. 3-3 3.4 Monitoring ........................................................................................................................... 3-4 4. Airborne Equipment ................................................................................................................... 4-1 4.1 Receivers ............................................................................................................................ 4-2 4.2 Aerials ................................................................................................................................. 4-3 4.3 Instrumentation ................................................................................................................... 4-4 4.4 Cross Pointer Flag Alarm .................................................................................................... 4-5 4.5 Marker Receiving Equipment .............................................................................................. 4-6 5. Points to Observe when Flying the ILS ...................................................................................... 5-1

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Instrument Landing System Operational Notes 1. Introduction

1.

Introduction

The Instrument Landing System (ILS) is an instrument presented, pilot interpreted, precision approach aid. The system provides the pilot with instrument indications which, when utilised in conjunction with the normal flight instruments, enables the aircraft to be manoeuvred along a precise, predetermined, final approach path. The ILS ground facilities have been categorised by international standardisation as follows: Facility Performance Category I An ILS which provides a specified quality of guidance information from the coverage limit of the ILS to the point at which the localiser course line intersects the ILS glide path at a height of 200 ft or less above the threshold. Using this category of equipment and provided that appropriate supplementary ground and airborne equipment is installed and operating, operations can be permitted down to a decision height of 200 ft and with a runway visual range (RVR) of the order of 800 metres. Facility Performance Category II An ILS which provides a specified quality of guidance information from the coverage limit of the ILS to the point at which the localiser course line intersects the ILS glide path at a height of 50 ft or less above the threshold. Using this category of equipment and provided that appropriate supplementary ground and airborne equipment is installed and rating, operations can be permitted down to a decision height of 100 ft and with...
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