TAER Processing Circle Files

• Use tables by approach fix, runway configuration, equipment type (jet, piston, turbine) and weather conditions (IMC, VMC) to obtain average speed from 100-mile position to 40-mile approach fix.
• Use average speed to compute time from 100-mile to 40-mile approach fix.
• Using same tables, obtain average time from 40-mile approach fix to Wheels On (sum of time from 100 to 40 and 40 to Wheels On).
• Time as computed above becomes the Start of Demand. Actual Wheels On becomes End of Demand.