[[File:Atm-scope.png]]
The objectives of ATS, as stated in [https://www.pilot18.com/wp-content/uploads/2017/10/Pilot18.com-ICAO -Annex -11-Air-Traffic-Services.pdf ICAO Annex 11], are to# prevent collisions between aircraft;# prevent collisions between aircraft on the maneuvering area and obstructions on that area; note that this objective does not include the apron and ATS in general is not intended to prevent collision with terrain.# expedite and maintain an orderly flow of air traffic;# provide advice and information useful for the safe and efficient conduct of flights;# notify appropriate organizations regarding aircraft in need of search and rescue aid and assist such organizations as required.
# prevent collisions between aircraft;
# prevent collisions between aircraft on the maneuvering area and obstructions on that area; note that this objective does not include the apron and ATS in general is not intended to prevent collision with terrain.
# expedite and maintain an orderly flow of air traffic;
# provide advice and information useful for the safe and efficient conduct of flights;
# notify appropriate organizations regarding aircraft in need of search and rescue aid, and assist such organizations as required.
The air traffic control (ATC) service is established Air Traffic Control Service to accomplish the first three objectives. While the first 1, 2 & 3 above and third are universally applicable to all ATC units, the second one this service is only relevant to aerodrome divided into: a. Area control unitsservice for objectives 1 & 3. b. The fourth objective is covered by the flight information Approach control service (FIS) and the last one is the subject of the alerting for objectives 1 & 3. c. Aerodrome control servicefor objectives 1, 2 & 3.Flight Information Service to accomplish objective 4 above.Alerting Service to accomplish objective 5 above.
As seen from the definition, there is a fourth type of ATS, the advisory service. No specific objectives are defined for this type of service. It is considered a temporary measure to facilitate the smoother transition from FIS to ATC.
Air Traffic Management The air traffic control (ATC) service is established to accomplish the aggregation of first three objectives. While the airborne functions first and ground-based functions required third are universally applicable to ensure all ATC units, the safe and efficient movement of aircraft during all phases of operations second one is only relevant to enable aircraft operators to meet their planned times of departure and arrival and adhere to their preferred aerodrome control units. The fourth objective is covered by the flight profiles with minimum constraints information service (FIS) and without compromising agreed levels of safetythe last one is the alerting service.
The advisory service has no specific objectives defined. It is considered a temporary measure to facilitate the smoother transition from FIS to ATC. Air Traffic Management is the aggregation of the airborne and ground-based functions required to ensure the safe and efficient movement of aircraft during all phases of operations to enable aircraft operators to meet their planned times of departure and arrival and adhere to their preferred flight profiles with minimum constraints and without compromising agreed levels of safety. '''Air Traffic Services (ATS)''', A generic term meaning air traffic control service which includes :
area control service
approach control service and
== Divisions of Airspace ==
Hong Kong's Division of Airspace in general divides into East, South, West Sector. The General Radar Sector Area and Vertical Limits are displayed in the diagram The detailed [[Areas-of-Responsibility]] that will be discussed in later chapters.
[[File:Division of-airspace.png|thumb|200px|Divisions of Airspace with Sector Limits]]
== See Also ==
[[Abbreviations]]