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Respond to Ride Information Request.  When a pilot requests a ride report at a specific altitude, the controller must determine if sufficient information is available from prior reports of turbulence to provide information to the pilot.  If previous relevant ride reports have been provided, the controller transmits this information to the pilot.  If no previous relevant reports exist, then other aircraft in the area may be queried to obtain information on ride conditions.
Check for Better Ride.  When a pilot asks the controller whether other flight levels have a better ride, the controller considers the position and altitude of the subject aircraft and information from previous relevant ride reports.  The resulting ride information is transmitted to the subject aircraft.
Evaluate Requested Maneuver.  This task takes place when a pilot requests an altitude change to avoid turbulence.  The controller must determine if the maneuver can be completed without creating new potential conflicts.  The controller can grant or deny the request, or modify the request by delaying it until a conflict will not occur.
Evaluate Requested Speed.  This task takes place when a pilot requests a speed change to reduce the effect of a turbulence encounter.  The controller must determine if the speed change can be completed without creating new conflicts.  The controller can grant or deny the request.
Assess Speed Change.  This task takes place when a pilot initiates a speed change after encountering severe turbulence.  The controller must determine if the new speed will create any new potential conflicts.  The controller can clear the aircraft to continue at its new speed or instruct it to revert to its previous speed.
Issue Emergency Descent Clearance.  If a pilot requests an emergency descent after encountering severe turbulence, it is assumed that the controller immediately vectors the aircraft clear of other traffic and issues a handoff clearance to the appropriate sector into which the aircraft will descend.
A more detailed description of the controller tasks is provided in Appendix D.  This appendix provides a full description of each task, which includes the task objective, subtasks required to perform the task, its relationship to other tasks, information requirements, and sample radio communications.
 

VI. OBSERVATIONS AND CONCLUSIONS

The present report documents the methodology and findings of the third and final year’s research (CY01) entitled "Development of Fast-Time Simulation Techniques to Model Safety Issues in the National Airspace System."  This chapter summarizes the accomplishments in meeting the research objectives, discusses observations regarding those accomplishments, and makes recommendations for further research and development.
Objectives and Accomplishments
This final phase focused on the following two research objectives:
Integration of human performance models of pilot and controller behavior with a simulation of air traffic through a region of airspace 

Operation of the linked simulation model for a clear-air turbulence sensor technology scenario.

These research objectives were met with the following accomplishments:
Identification of a scenario of air traffic in an en route sector with CAT and specification of an experimental design of simulation runs to assess the impacts of a CAT sensor technology in that sector.  Traffic volumes and routes for the scenario were derived from ETMS data for an en route sector in the Boston ARTCC.

Specification of flight crew and controller procedures, including message communications, related to aircraft transit of an en route sector and encounter with clear-air turbulence events.

Development of an agent-based simulation model of air traffic in an en route sector with CAT.  The model includes agents for controllers, flight crews, aircraft, radar surveillance, communication channels, CAT weather events, and sensors.  The simulation was built using the RFS simulation technology, which implements agent-based, hybrid (continuous time/discrete event) simulations.  The RFS-based model (i.e., without the MIDAS linkage) was executed to simulate a two-hour period in the sector, including 40 aircraft transiting the sector, some of which encountered turbulence and issued PIREPs.  Evasive maneuvers were not simulated for this test.
　
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