Turbulence exposure, by intensity level (total aircraft-minutes)
Turbulence exposure with not all passengers seated (i.e., with warning less than two minutes), by intensity level (number of aircraft and total aircraft-seconds)
Turbulence exposure with not all flight attendants seated (i.e., with warning less than a random time from two to five minutes), by intensity level (number of aircraft and total aircraft-seconds)
Number of aircraft warned and, for those aircraft, amount of warning time prior to entering turbulence, by intensity level (seconds)
Percent of aircraft not “warned” prior to entering various turbulence intensity levels
Number of emergency descent initiations
Number of non-emergency altitude change initiations
Number of speed change initiations
Flight Crew Response to CAT
In order to assess the response of flight crews to the CAT, statistics (mean and standard deviation) for each of the following were specified:
Number of CAT sensor alerts received
Number of relevant PIREPs overheard
Number of pilot-to-controller messages transmitted
Number of controller-to-pilot messages received
Controller Response to CAT
In order to assess the response of controllers to the CAT, statistics (mean and standard deviation) for each of the following were specified for the subject-sector controller agent (within each one-minute interval and for the whole simulation time):
Controller visual workload, time-weighted average as summed over all activities
Controller auditory workload, time-weighted average as summed over all activities
Controller cognitive workload, time-weighted average as summed over all activities
Controller psychomotor workload, time-weighted average as summed over all activities
Controller overall workload, time-weighted average of sum of visual, auditory, cognitive, and psychomotor loads as summed over all activities
Also, within each 10-minute interval and for the whole simulation time, the following statistics (mean and standard deviation) were specified:
Time spent in Conflict Resolution task
Time spent in Evaluate Requested Maneuver task
Communication
In order to assess the amount of controller-pilot communication resulting from the use of the various CAT sensors, statistics (mean and standard deviation) for each of the following (within each 5-minute interval) were specified:
Number of PIREPs transmitted during the interval
Number of altitude change requests transmitted during the interval
Number of pilot-to-controller messages other than PIREPs or altitude change requests transmitted during the interval
Number of controller-to-pilot messages transmitted during the interval
Experimental Protocol
Five cases are modeled in the planned experiments: one case for each of the three sensors tested, a nominal case where all aircraft have no sensor, and a nominal case without turbulence in the sector. Statistical sampling is planned using a Monte Carlo simulation, where ten statistically independent replications of the traffic are used to test each of the five cases.
IV. MODELING APPROACH
An overview of the modeling logic for the Phase III demonstration is depicted in Figure IV-1, showing the agents simulated and the information passed among them. All agents are RFS agents unless indicated as being simulated with the MIDAS human performance model. Two hours of traffic in the subject sector are simulated. All neighboring sectors are modeled as a single upstream/downstream sector.
The agents and their behavioral assumptions modeled are described further in the following sections.
Figure IV-1 Simulation Model for En Route CAT Sensor Analysis
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