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This chapter has sought to explain safety criteria in the greater context of the safety case approach to safety assessment. To this end, explanations have been provided on some basic concepts, how safety can be evaluated and an outline of the safety case approach has also been provided.
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4.1 INTRODUCTION............................................................................................................... C-4-2

4.2 WHAT ARE ASSUMPTIONS, CONSTRAINTS AND ENABLERS? ................................ C-4-3

4.2.1 ASSUMPTIONS ...............................................................................................................................C-4-3

4.2.1.1 Traffic Assumptions.....................................................................................................................................C-4-3

4.2.1.2 Runway in use ............................................................................................................................................C-4-4

4.2.2 CONSTRAINTS................................................................................................................................C-4-4

4.2.3 ENABLERS ......................................................................................................................................C-4-4

4.2.4 SIMILARITIESANDDIFFERENCES................................................................................................C-4-4

4.3 SELECTINGASSUMPTIONS,CONSTRAINTSANDENABLERS.................................C-4-6

4.3.1 CHOOSING A TRAFFIC SAMPLE....................................................................................................C-4-6

4.3.1.1 Traffic distribution over Time .......................................................................................................................C-4-7

4.3.1.2 Geographic distribution of traffic ..................................................................................................................C-4-8

4.3.1.3 Using Forecast Traffic Samples ....................................................................................................................C-4-9

4.3.2 DETERMINING THE PREDOMINANT & SECONDARY RUNWAY(S) IN USE...............................C-4-10

4.3.3 CONSTRAINTS, MITIGATION AND ENABLERS.............................................................................C-4-10

4.4 WHEN TO IDENTIFY ASSUMPTIONS, CONSTRAINTS & ENABLERS....................... C-4-11

4.5 SUMMARY...................................................................................................................... C-4-11

Figure 4 - 1: Consistency ..................................................................................................C-4-2
Figure 4 - 2: ATM/CNS......................................................................................................C-4-3
Figure 4 - 3: Constraints – Mitigation - Enablers...............................................................C-4-5
Figure 4 - 4: Geographic Traffic Distribution .....................................................................C-4-8
　
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