NATCA Bookshelf

2016 CBA Tentati ve Agreement Page 168 of 217 E. Each transitional IFR/SVFR overflight (aircraft that exit center airspace at an altitude 4000 feet or more different from the aircraft altitude entering the center area) is given a weight of 1.50. F. Each overflight (non - transitional) is given a weight of 1.00. G. Each VFR advisory is given a weight of 0.50. H. For each hour of operation the hourly counts for (A) th rough (G) are added together to obtain the average weighted hourly count. I. For each day, and the prior 364 days (i.e., use a 365 - day count), calculate the percent that military air traffic comprises of total air traffic. Divide that percent figure by four, and then multiply by the average weighted hourly count derived in (H). This will yield the military add - on count. (Example: The military traffic count equals 20% of the total traffic count; the average weighted hourly count (H) = 500). The formula is: (. 2 / 4 = .05 x 500 = 25) J. For each day, and the prior 364 days (i.e., use a 365 - day count) calculate: 1. The percent of total traffic that is: a) Jet aircraft b) Piston powered and turbo - prop aircraft combined 2. Take the lower percentage of the two figures derived in (1) above and divide it by four, then multiply by the average weighted hourly count derived in (H). This will yield the traffic mix add - on count. Example: 1. Jet aircraft = 58% 2. Piston powered and turbo - prop aircraft combined = 32% 3. Average weighted hou rly count (H) = 500 4. .32 / 4 = .08 x 500 = 40 K. For each day, and the prior 364 days (i.e., use a 365 - day count), calculate the percent that domestic over water traffic comprises of total domestic traffic and divide by 5. Multiply that modified percentage f igure by the average weighted hourly count derived in (H). This will yield the domestic over water add - on count. (Example: The domestic over water traffic count equals 20% of the total domestic traffic count; the average weighted hourly count (H) = 500). T he formula is: (note: the domestic over water count is included in the total domestic traffic count) (.20/5 = .04 x 500 = 20)

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