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arrival rate modeling tool

This tool calculates landing rates and an appropriate inter-arrival spacing through a feed sector or Gate.

Range From Touchdown / IAS

10 Nm 250 245 240 235 230 225 220 215 210 205 200 195 190 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 095 090 085 080 075 070 065 060

8 Nm 250 245 240 235 230 225 220 215 210 205 200 195 190 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 095 090 085 080 075 070 065 060

6 Nm 250 245 240 235 230 225 220 215 210 205 200 195 190 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 095 090 085 080 075 070 065 060

5 Nm 250 245 240 235 230 225 220 215 210 205 200 195 190 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 095 090 085 080 075 070 065 060

4 Nm 250 245 240 235 230 225 220 215 210 205 200 195 190 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 095 090 085 080 075 070 065 060

3 Nm 250 245 240 235 230 225 220 215 210 205 200 195 190 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 095 090 085 080 075 070 065 060

2 Nm 250 245 240 235 230 225 220 215 210 205 200 195 190 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 095 090 085 080 075 070 065 060

1 Nm 250 245 240 235 230 225 220 215 210 205 200 195 190 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 095 090 085 080 075 070 065 060

Runway and winds

Runway 360 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110 100 090 080 070 060 050 040 030 020 010

2000ft_wind 010 020 030 040 050 060 070 080 090 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 / 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120

surface_wind 010 020 030 040 050 060 070 080 090 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 / 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120

Gate One

gate_one_heading 360 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110 100 090 080 070 060 050 040 030 020 010

Gate FL 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110 100 090 080 070 060 050 040 030

Gate IAS 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110 100 090 080 070 060

gate_one_wind 010 020 030 040 050 060 070 080 090 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 / 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120

Gate Two

gate_two_heading 360 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110 100 090 080 070 060 050 040 030 020 010

Gate FL 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110 100 090 080 070 060 050 040 030

Gate IAS 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110 100 090 080 070 060

gate_two_wind 010 020 030 040 050 060 070 080 090 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 / 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120

 

Use

• Select an IAS for each of the ranges from touchdown for an average speed profile on final approach.
• Select a runway direction.
• Select a surface and 2000ft wind.
• Select a flight level, IAS, and wind for each Gate.
• Click the [Calculate table of speeds and landing rates] button.

A 'gate' is a point on an arrival route where a sector delivers arrivals to the next sector at a specified in trail spacing. The 'gate' concept also applies to feeding a sequence from a hold by providing in trail spacing between arrivals leaving the hold.

Results

This tool generates a table of distances from touchdown at 0.5 Nm increments. Each row shows:

• Range from touchdown in NM.
• IAS, and predicted Ground Speed (GS).
• Headwind (HW).
• Time to transit the half mile segment (Secs).
• Total time to touchdown (TTT).
• Arrival Rate (Rate).
• Predicted Ground Speed at the gate (GGS).
• Recommended in-trail spacing at Gate One and Gate Two for an arrival rate in NM (GnTr).

For example: aircraft are spaced on final approach so that the average range from touchdown of the next to land is 5 NM when the one ahead lands. Read across from 5 NM for the results.

Figures are rounded to the nearest integer.

The in-trail spacing figure is for a flow of arrivals through a single 'gate'. Double the in-trail figures for an balanced delivery rate through two gates at the same time.

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20070426