The ACC is solely responsible for the en-route traffic, while the APP unit controls the Arrival/Departure traffic in a single extended sector. which may be large in both horizontal and vertical dimensions.
ACC EN-ROUTE SECTOR 
APP DEPARTURE SECTOR  APP ARRIVAL SECTOR 
TOWER 

As traffic density increases, it may be necessary to establish functional Arrival and Departure Sectors within the APP area of responsibility.
ACC EN-ROUTE SECTOR 
APP DEPARTURE SECTOR  APP ARRIVAL SECTOR 
APP FINAL DIRECTOR 
TOWER 

As traffic density increases even further, the Arrival task itself could be sectorised into an (Initial) Arrival Sector and a Final Director (Sector).
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OPTION 4

Whilst traffic density is low, the ACC handles most of the traffic in a combined En-route
+ Arrival/Departure Sector. APP is responsible only for the final vectoring of arrival traffic

As traffic density increases, it may be necessary to divide the ACC function into two sectors (En-route and Departure).
ACC EN-ROUTE SECTOR 
ACC DEPARTURE SECTOR  ACC ARRIVAL SECTOR 
APP ARRIVAL SECTOR 
TOWER 

At high traffic density an ACC Arrival Sector is introduced to separate the arrival function from the en-route function.
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OPTION 5

At low traffic density, the APP unit has responsibility for arriving traffic in the APP Arrival Sector.
ACC EN-ROUTE SECTOR 
ACC DEPARTURE SECTOR  APP ARRIVAL SECTOR 
TOWER 

As traffic density increases, it may be necessary to establish a functional Departure Sector within the ACC area of responsibility.
ACC EN-ROUTE SECTOR 
ACC DEPARTURE SECTOR  APP ARRIVAL SECTOR 
APP FINAL DIRECTOR 
TOWER 

As traffic density increases even further, the Arrival task itself could be sectorised into an APP (Initial) Arrival Sector and an APP Final Director (Sector).
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7.1 INTRODUCTION..............................................................................................................................C-7-2

7.2 EVOLUTIONOFTERMINALAIRSPACE........................................................................................C-7-2

7.2.1 EVOLUTION OF THE APPROACH CONTROL FUNCTION ............................................................C-7-4

7.3 EVOLUTIONARY CHARACTERISTICS..........................................................................................C-7-5

7.3.1 GENERAL CHARACTERISTICS .....................................................................................................C-7-5
　
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本文鏈接地址：EUROCONTROL MANUAL FOR AIRSPACE PLANNING 2(66)