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Many tasks are interruptible.  The current task might be interrupted if an event occurs that requires a response with a higher priority.  In addition, some tasks involve one or more subtasks and must be paused temporarily while these subtasks are completed.
Errors in controller perception of data have not been included in this initial version of the specification.  When the controller completes a scan of sector conditions, for example, it is assumed that the data observed from the radar display is accurately perceived and recognized.  Future enhancements to the specification could incorporate perception errors that could be applied to any action where new information is obtained, such as scanning the radar display or receiving a radio message.
The fundamental responsibility of a sector controller is to detect and resolve conflicts between aircraft, where a conflict is defined as aircraft flight paths that will result in a horizontal separation of less than 5nm between aircraft that are separated by less than 1,000 feet vertically (2,000 feet above Flight Level 290).
General Structure
For convenience in presentation, controller tasks have been grouped into three modules addressing different aspects of the controller’s responsibilities.  These modules are listed below and their interrelation is illustrated in Figure V-2.
. Basic Sector Management.  This module represents the controller tasks involved in accepting and performing handoffs, maintaining situation awareness of aircraft positions through periodic scans of the radar display, and checking for potential conflicts between aircraft or deviations of an aircraft from its last clearance.

. Conflict Resolution.  This module represents the controller tasks performed after a conflict has been identified, including formulating and issuing an appropriate clearance to resolve the conflict.

. CAT.  This module represents the controller tasks that are involved in responding to events associated with clear air turbulence.  These tasks include receiving pilot reports (PIREPs), using these reports to maintain situation awareness of turbulence conditions, and responding to pilot requests for information or turbulence avoidance maneuvers.

 

Figure V-2  Functional Specification Overview
Module Components
The activity within each module is divided into a number of specific tasks, as discussed below.
Basic Sector Management Tasks
Sector Management.  This is an overall management task in which the controller identifies, prioritizes, and initiates tasks to be completed.  This task is executed continuously.
Respond to Radio Message.  As various radio messages are received, the controller must hear and understand the message, then identify an appropriate course of action.  This task initiates additional tasks in response to each message, depending on the content of the message.
Receive Handoff.  An aircraft approaching a sector boundary will be instructed by the upstream controller to change radio frequencies and contact the downstream controller (known as a handoff).  As aircraft enter the sector, the controller must update his or her situation awareness.  This includes recognizing that an aircraft is being handed off (by observing a flashing aircraft data block on the radar display), locating and reviewing the flight progress strip, and storing this information in memory.  The controller also initiates checks for conflicts and potential turbulence encounters for the subject aircraft. 
Issue Handoff Clearance.  Upon receiving a handoff call from an entering aircraft, the downstream controller first completes the turbulence and conflict checks initiated in the previous task after first observing the aircraft approaching the sector, then issues a handoff clearance, which includes any required changes in flight path or turbulence reports.
Turbulence Check.  The controller determines if an aircraft entering the sector will be traveling through any areas of known turbulence.  This is achieved by comparing the planned flight path for the aircraft to the controller’s awareness of the presence of turbulence from prior CAT reports.  If the controller believes the subject aircraft will encounter an area of turbulence, a turbulence warning will be provided to the aircraft as part of the handoff clearance.
　
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