Evaluating Airfield Capacity (2012) / Chapter Skim
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From page 73... ...
71 How to Select the Appropriate Airfield Capacity Model Selecting the appropriate level of model sophistication is not as easy as a one-size-fits-all approach. Many factors contribute to the type of model that is best suited to analyze a particular capacity issue.
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From page 74... ...
72 evaluating airfield Capacity • Changes in air traffic control (ATC) rules and procedures • ATC workload and human factors (such as pilot proficiency)
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From page 75... ...
how to Select the appropriate airfield Capacity Model 73 extension also may depend on the purpose and anticipated benefits of the improvement, which, in turn, may determine the evidence the model must provide to convince stakeholders that the benefits of the improvement are at least as great as its cost. For example, there may be a need for convincing evidence that the benefit of the improvement is justified because it would require significant capital investment or it may have adverse environmental effects.
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From page 76... ...
74 evaluating airfield Capacity Changes in Runway Crossings Airfield simulation modeling generally is required to reflect the effects of runway crossings on airfield capacity primarily because of the complex interactions between the aircraft arriving and/or departing on the runway and the aircraft trying to cross that runway. Changes in the frequency of runway crossings can be caused by addition or removal of runway crossing points, use of land and hold short operations (LAHSO)
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From page 77... ...
how to Select the appropriate airfield Capacity Model 75 procedure, such as a simultaneous offset instrument approach procedure or a dependent converging instrument approach procedure using a converging runway display aid. Such improvements increase the complexity of an existing airfield operation to the extent that analyzing their benefits using analytical models becomes very difficult.
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76 evaluating airfield Capacity voice communication is required on the part of the pilots and controllers, often is characterized as being driven by how fast controllers and pilots can talk. Pilot proficiency is rarely modeled in terms of how it affects airfield capacity except in cases where pilot proficiency with the English language limits the ability of controllers at busy international airports to conduct visual approaches.
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From page 79... ...
how to Select the appropriate airfield Capacity Model 77 modeling sophistication. In most cases, these conditions occur at larger airports rather than at smaller airports.
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From page 80... ...
78 evaluating airfield Capacity other factors that may affect airfield capacity. Airports without commercial passenger service, referred to as general aviation airports, can still be served by a diverse aircraft fleet and may still require a Level 4 or Level 5 airfield capacity evaluation based on this fleet and the number of operations at the airport, particularly if airport taxiways and aircraft parking areas are an issue.
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From page 81... ...
how to Select the appropriate airfield Capacity Model 79 model was calibrated properly. New data should be collected to refresh any needed inputs related to forecasts and demand patterns.
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From page 82... ...
80 evaluating airfield Capacity See Chapter 3 for a discussion of the data requirements for each level of sophistication. A guide to data sources is provided in Appendix B of this guidebook.
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how to Select the appropriate airfield Capacity Model 81 High-Level Matrix for Preliminary Screening of Levels of Modeling Sophistication Figure 5-2 presents a high-level matrix of the major decision factors to be considered in choosing a level of modeling sophistication for a particular set of circumstances and conditions. This matrix is intended for preliminary screening purposes, and can be used in conjunction with the more detailed decision hierarchy described in the text.
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82 Evaluating Airfield Capacity Figure 5-2. High-level matrix for choosing a level of modeling sophistication.
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How to Select the Appropriate Airfield Capacity Model 83 Figure 5-3. Decision hierarchy for selecting level of modeling sophistication.
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84 Evaluating Airfield Capacity Table 5-1. Explanatory comments on questions in decision hierarchy.
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How to Select the Appropriate Airfield Capacity Model 85 Source: ACRP 03-17 Research Team. Table 5-1.
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Main Purposes of Airfield Capacity Analysis Elements of Airfield Considered Airfield Capacity Metrics Level of Modeling Sophis�ca�on Case Study (short �tle) Capacity Benefits Aircra� Delay NextGen Technologies Environmental Constraints System Planning Runways Taxiways Gates Terminal Airspace NAS Hourly Throughput Annual Service Volume Level 1 & 2 AC Level 3 Analy�cal Level 5 Simula�on Master Plans 1 Airport Master Plan (ARW)
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From page 89... ...
how to Select the appropriate airfield Capacity Model 87 • Elements of Airfield Considered: Runways, taxiways, gates, terminal airspace, NAS • Airfield Capacity Metrics: Hourly throughput, annual service volume • Level of Modeling Sophistication: Level 1 and 2 table lookup or nomographs (e.g., the AC) ; Level 3 analytical models (e.g., the ACM)
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