Air Traffic Management
Procedures for
Air Navigation Services
This edition incorporates all amendments
approved by the Council prior to 30 June 2001
and supersedes, on 1 November 2001,
all previous editions of Doc 4444.
International Civil Aviation Organization
Doc 4444
ATM/501
Fourteenth Edition — 2001
AMENDMENTS
The issue of amendments is announced regularly in the ICAO Journal and in the
monthly Supplement to the Catalogue of ICAO Publications and Audio-visual
Training Aids, which holders of this publication should consult. The space below is
provided to keep a record of such amendments.
RECORD OF AMENDMENTS AND CORRIGENDA
AMENDMENTS CORRIGENDA
No.
Date
of issue
Date
entered
Entered
by No.
Date
of issue
Date
entered
Entered
by
(ii)
PANS-ATM (iii) 1/11/01
TABLE OF CONTENTS
Page Page
FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (xi)
1. Historical background . . . . . . . . . . . . . . . . . . . . . . . (xi)
2. Scope and purpose. . . . . . . . . . . . . . . . . . . . . . . . . . (xi)
3. Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (xi)
4. Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . (xii)
5. Publication of differences . . . . . . . . . . . . . . . . . . . . (xii)
6. Promulgation of information. . . . . . . . . . . . . . . . . . (xii)
7. Contents of the document . . . . . . . . . . . . . . . . . . . . (xii)
CHAPTER 1. DEFINITIONS . . . . . . . . . . . . . . . . . 1-1
CHAPTER 2. ATS SAFETY MANAGEMENT. . 2-1
2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.3 ATS safety management activities. . . . . . . . . . . . . 2-1
2.4 Monitoring of safety levels . . . . . . . . . . . . . . . . . . 2-1
2.4.1 Collection and evaluation of
safety-related data . . . . . . . . . . . . . . . . . . . . 2-1
2.4.2 Review of incident and other
safety-related reports . . . . . . . . . . . . . . . . . . 2-1
2.5 Safety reviews . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.5.1 General requirements . . . . . . . . . . . . . . . . . . 2-2
2.5.2 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.6 Safety assessments . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.6.1 Need for safety assessments . . . . . . . . . . . . 2-3
2.6.2 Safety-significant factors . . . . . . . . . . . . . . . 2-3
2.7 Safety-enhancing measures . . . . . . . . . . . . . . . . . . 2-4
CHAPTER 3. ATS SYSTEM CAPACITY AND
AIR TRAFFIC FLOW MANAGEMENT. . . . . . . . . 3-1
3.1 Capacity management . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.2 Capacity assessment. . . . . . . . . . . . . . . . . . . 3-1
3.1.3 Regulation of ATC capacity and
traffic volumes . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.4 Enhancement of ATC capacity . . . . . . . . . . 3-1
3.1.5 Flexible use of airspace . . . . . . . . . . . . . . . . 3-2
3.2 Air traffic flow management . . . . . . . . . . . . . . . . . 3-2
3.2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2.2 Flow management procedures . . . . . . . . . . 3-2
3.2.3 Strategic planning . . . . . . . . . . . . . . . . . . . . 3-2
3.2.4 Pre-tactical planning . . . . . . . . . . . . . . . . . . 3-3
3.2.5 Tactical operations . . . . . . . . . . . . . . . . . . . 3-3
3.2.6 Liaison. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
CHAPTER 4. GENERAL PROVISIONS FOR
AIR TRAFFIC SERVICES . . . . . . . . . . . . . . . . . . . . 4-1
4.1 Responsibility for the provision of
air traffic control service. . . . . . . . . . . . . . . . . . . . 4-1
4.1.1 Area control service . . . . . . . . . . . . . . . . . . 4-1
4.1.2 Approach control service . . . . . . . . . . . . . . 4-1
4.1.3 Aerodrome control service . . . . . . . . . . . . . 4-1
4.2 Responsibility for the provision of flight
information service and alerting service . . . . . . . 4-1
4.3 Division of responsibility for control
between air traffic control units . . . . . . . . . . . . . . 4-1
4.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.3.2 Between a unit providing aerodrome
control service and a unit providing
approach control service. . . . . . . . . . . . . . . 4-1
4.3.3 Between a unit providing approach
control service and a unit providing
area control service. . . . . . . . . . . . . . . . . . . 4-2
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