A CONTROLLER TOOL FOR TRANSITION AIRSPACE

David McNally, Heinz Erzberger, and Ralph Bach
NASA Ames Research Center

William Chan
San Jose State University


Abstract

This paper describes simulation and field test evaluation of an integrated decision support 
tool for trial planning and arrival metering in transition airspace, i.e., en route airspace 
near the terminal area. The challenge for this tool will be to solve tactical arrival-
metering problems.  The tool calculates fuel-efficient descent trajectories, arrival 
sequencing and metering, and includes a trial-planning function for conflict resolution.  
Simulation evaluations were conducted at NASA Ames in April and July of 1998 and 
field-test evaluation was conducted at Fort Worth Center in November 1998.  Results 
indicate the trial-planning function provided benefits for strategic conflict resolution but 
controllers preferred not to use it in the more tactical arrival-metering environment.  
Controllers often used the trial planner to determine if a direct route to a downstream fix 
along the aircraft's route of flight was feasible.  The test also confirmed the high 
controller acceptance of the trial-planning capability.