MAY 2005

CIVIL AVIATION TRAINING COLLEGE,

BAMRAULLI, ALLAHABAD.PREFACE

The DME Concept Level Course is developed at Civil Aviation Training College, Allahabad, India with the purpose to equip the CNS maintenance personnel with the conceptual knowledge and skill on DME, including functional description block level of the various DMEs used in Airports Authority of India (AAI) and to explain the standards and recommendations given by ICAO.

DME Concept Level Introduction to DME, Communication Principles, Concepts of DME, ICAO specifications and terminologies, functional description with block diagrams of DMEs used in AAI (AWA/GCEL, ASI, THALES) specifically AWA/GCEL models in brief.

Communication Principles in relations to DME (Chapter- 2 of DME Concept Level) is covered in the relevant portions of Communication Principles (General) Volume.

A copy of this manual is furnished to each trainee and Regional Training Centres. For changes, additions or deletions users are encouraged to submit their valuable suggestions to

CHIEF INSTRUCTOR (CNS)

Civil Aviation Training College

Airports Authority of India

P.O. - Bamrauli, Allahabad 211 012

(INDIA)

TABLE OF CONTENTS

CHAPTER NO.TOPICPAGE NO

1INTRODUCTION TO DME1-6

2COMMUNICATION PRINCIPLES IN RELATION TO DME7A-7B

3DME CONCEPTS8-21

4DME TERMINOLOGIES22-23

5ICAO SPECIFICATIONS24-37

6MONITOR AND CONTROL38-42

7FUNCTIONAL DESCRIPTIONS WITH BLOCK DIAGRAM

i. AWA / GCEL

ii. ASI

iii. THALES

43-151

ANNEXUREASI DME SIMPLIFIED BLOCK DIAGRAM

Chapter No.: One

Subject:

Introduction

Topic:

Introduction to DME

Objective: Upon completion of this lesson the trainees will be able to explain

a. Navigation Categorization; Navigation Fix

b. Purpose and use of DME

c. Models of DME used in AAIChapter No.: Two

Subject:

Communication Principles

Topic:

Communication Principles (DME)

Objective: Upon completion of this lesson the trainees will be able to explain

a. Modulation Techniques specifically Amplitude Modulation and Pulse transmission

b. Transmission Lines and its basic concept

c. Antenna Systems

d. Space Wave PropagationChapter No.: Three

Subject:

DME

Topic:

DME Concepts

Objective: Upon completion of this lesson the trainees will be able to explain

i. Principles of operation of DMEii. Principles of Secondary Radar

iii. Simplified Block Diagram Of DME System

iv. Modes of Operation

v. SYSTEM TIMING

vi. RANGE CALCULATION

vii. CHARACTERISTIC FEATURE OF DMEChapter No.: Four

Subject:

DME Terminologies

Topic:

DME Terminologies

Objective: Upon completion of this lesson the trainees will be able to explain

Terminologies used in relation to DME

Chapter No.: Five

Subject:

ICAO Specification

Topic:

Updated ICAO Specification

Objective: Upon completion of this lesson the trainees will be able to understand

ICAO Specifications and recommendations in respect of DME and

Chapter No.: Six

Subject:

Monitor and Control

Topic:

Monitor and Control

Objective: Upon completion of this lesson the trainees will be able to explain

Monitoring and control guidelines

Monitored Parameters and Tolerances for Alarm

Primary and Secondary Parameters

Chapter No.: Seven

Subject:

Functional Description With Block Diagram

Topic:

DME Block Diagram DescriptionObjective: Upon completion of this lesson the trainees will be able to explain

AWA DME Block Diagram Description

AWA DME Antenna And Its Characteristics

ASI DME Functional Description And Block Diagram Thales DME Functional Description And Block Diagram