*3.6. Sample Bowtie Application*

A sample event, Engine Fire, was selected and analysed by developing a Bowtie shown in Figure 8 in order to demonstrate the applicability of MxFACS output to existing risk methodologies, currently utilised by regulators. This allows users of the MxFACS data to better understand what further analysis may be required or can be done as well as the interdependencies between maintenance factors. Consequently, this aids the risk analysis and assessment processes through qualitative analysis of the control barriers which are in place.

**Figure 8.** Sample bowtie analysis.

It should be noted that the sample shown in Figure 8 shows only the threats, consequences, and escalating factors derived directly from the MxFACS qualitative analysis process. Such bowties would require analysts to further evaluate the barriers which failed in order for the top event to occur, as part of their risk analysis processes.

By developing and maintaining such Bowties, it would be possible for users to continually monitor the e ffectiveness of barriers as part of their risk managemen<sup>t</sup> process, as well as aiding in identifying the particularly high-risk areas which require further attention. This process is of course reliant upon an appropriate level of detail being captured following an event so as to be able to accurately depict the barriers which were in place and failed. Otherwise, the process becomes an exercise of interpretation as opposed to use of factual knowledge.
