1 introduction to categorical amendment criteria (cac) joe jurecka aviation program leader nws...
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Introduction to Categorical Amendment Criteria (CAC)
Joe JureckaAviation Program Leader NWS Lubbock, TX Commercial Pilot ASMEL Instrument
SAWS IIIPhoenix, AZ23 Mar 2010
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Contributors
Cammye Sims, Aviation Services BranchBrad Sipperley, WFO Fairbanks, AKAaron Tyburski, WFO State College, PADavid Hotz, WFO Morristown, TNJoe Dellicarpini, WFO Boston, MATodd Lericos, WFO Caribou, ME
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Presentation Outline
Why change? Review of Standard Amendment Criteria CAC Methodology, Thresholds, and Limitations Amendments Using CAC Benefits of Using CAC Implementation
• To provide the aviation community with a more responsive product tailored to their regulatory needs
• A more concise productis possible when theforecast is tailored toaeronautical decisionsand impacts.
Why make a change?
Impacts of Standard Amendment Criteria
• Non-standard individual airport minimums ignoredOnly 200 feet and 1/2SM used (CAT I ILS)Airfields served only by non-precision
approaches are not represented
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Impacts of Standard Amendment Criteria
• Aviation community receives too many amendments that do not have an impact on airport operations
• Forecaster time is diverted from sites/tasks needing attention
• TEMPO groups may restrict operations resulting in flight delays and impacts the National Airspace System (NAS)
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Employs the following important concepts:Ceiling and Visibility meet specific airport
requirementsGroup Ceiling and Visibility together into
categories to match FAA RegulationsTEMPO groups checked immediately against
METARS to notify forecasters of resulting customer impacts
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Methodology
Customized Airport Minimums
• Airport minimums tailored and grouped together to meet specific airport requirements
• Eliminates unnecessary or non applicable amendments
• Example: Airport minimums 400’ AND 1SM (not standard 200’ AND/OR 1/2SM)
• Eliminates need for amendments once ceiling or visibility falls below 400’ and 1SM
• Also applies to alternate minimums14
• WFOs have the ability to meet the special needs of the airport or local Air Traffic Management with additional amendment criteriaExamples
• Phoenix Sky Harbor (KPHX)– Visual approaches: Minimum ceiling of 5000’
• Boston Logan Airport (KBOS)– Circling approaches: Minimum ceiling of 1400’ and
visibility of 3SM
• Increased service to our customersThese are new, customer-driven thresholds only available using CAC
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CAC Local Thresholds
CAC Limitations
Example: KLBB - Runway 17R Category A Minimum:
200’ and 1/2SM- Runway 35 Category A Minimum:
600’ and ¾ SM
• CAC uses the lowest airport minimums, which are 200’ and 1/2SM
Only addresses categories for ceiling and visibility
Does not include wind or RVRThresholds are not “runway specific”
• Limited to one value for each category at each airport
• Categorical Amendment Criteria:The lowest element of ceiling or visibility is
considered “controlling” for amendment purposes
• Standard Amendment Criteria:Software prompts for an amendment based on
ceiling OR visibility
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CAC vs. Standard Amendment Criteria
• Better customer service amendments based upon specific airport criteria Regulatory needs of the flying community addressed Quicker response to customer needs, including out of category
TEMPO groups
• Forecaster’s time maximized Improved situational awareness Allows focus on sites needing attention amendments only issued for meaningful
thresholds• Fewer amendments
(WFO FAI decreased by 23%)• Comparable reduction seen in Lubbock
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Benefits of Using CAC
• Notify Users well ahead of transition date– Airlines– FBOs– ATC Facilities (TRACON/ARTCC/AFSS)– FAA Safety Team (delivery to GA community)
• Modify AVNFPS to display CATegory well in advance of transition date.
• Transition to CAC and remove CIG/VSBY from AvnFPS
• Follow-up with your aviation partners20
CAC Transition for NWS Offices
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