A "Bowtie" diagram can be used in safety risk assessments to analyse and demonstrate causal relationships in high risk scenarios – in this case, the challenge of returning air traffic services to normal.
The Amsterdam Schipol airport COVID-19 HIRM bowtie chart provides an example Bowtie diagram that identifies potential threats and hazards associated with returning air traffic services to normal at the Amsterdam Schiphol airport. It contains acronyms and references to organisations and locations on that airport, which may be unfamiliar to other parties. Rather than being a general template, it is provided to assist ANSPs to avoid overlooking potential threats and hazards at their own airports.
It should be noted that each actor with safety responsibilities within the Schiphol organisation will produce a similar diagram for their area of operations. These will then all be coordinated by a safety office to ensure that no threats are missed, and work is not duplicated. The colour coded rankings (for example, 'good', 'poor', 'medium', 'low contribution') refer to the estimated effectiveness of the barriers (i.e. the chance that a barrier could prevent a threat becoming an event).
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