Figure 4 - 3: Airspace Protected Volumes
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4.3.1 FAST TIME SIMULATION ADVANTAGES
. one of the most frequently used methods for sector capacity assessments

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gives opportunity to collect quality data

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relatively unlimited scope and great flexibility

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relatively simple to assess various alternatives

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relatively easy Test Case adaptation

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relatively easy to test large number of traffic samples

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can use real traffic and environment data

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good acceptance of the results

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can evaluate the achievement of the TLS (Target Level of Safety)

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can inform safety case development

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4.3.2 FAST TIME SIMULATION DISADVANTAGES
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simplified model of “real” operation

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can provide only statistical data

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cannot replicate tactical controller interventions

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quality of results depends heavily on the accuracy of the model

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limited aircraft performance and simplified aircraft behaviour

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low representation of meteorological conditions

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difficult to involve users

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Because of the theoretical nature of this method, the simulation objectives should be achieved by analysing statistical recorded data such as: capacity, sector and segment load, workload, number of conflicts, etc.
The design team should take consideration of the following principles when setting up the simulation objectives. Objectives should :
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be specific and limited

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be measurable

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not aim to test too many things in one simulation

After deciding on the simulation objectives the design team should complete the following actions:

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define the Base and Test Cases in general terms and ascertain their feasibility.

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decide on the number of assessments required

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estimate the time and resources needed

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set target and the completion deadline

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4.5.1 ESTABLISH DATA COLLECTION METHOD
Prior to Test Case definition it is necessary to decide which parameters and performance indicators will be used to assess the simulation and what method will be used to collect the required data.
The output from a fast-time simulation includes a large amount of data which can be clustered into several groups:
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generic statistical data

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 sector load

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 routes/segments load

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 point load

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airport/runway acceptance rate

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airport/runway departure rate

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