UK Overseas Territories Aviation Circular (OTAC) - Air Safety ...

Documenting the SMS OTAC 119-4, 125-2, 139-3, 140-3, 145-8, 171-3, 172-5, 173-3, 176-4Appendix DRisk assessment matrixThis example is illustrative only. Other models may be found with different numbers oflevels on the severity/likelihood scales.Table 1Extreme HarmModerate HarmSlight HarmNuisanceSeverityQualitative definitionsAccidentAs defined in OTAR 1Fatal or serious injuries caused, structural damage etc.Serious incidentOutcome not under controlAffecting or would affect safety of operationMinor incidentNo or minor injuries causedNo immediate effect on safetyTable 2LikelihoodQualitativedefinitionVeryUnlikelyUnlikely everto occurUnlikely Possible Likely Very LikelyUnlikely tooccurduring totaloperational lifeMay occurduring totaloperational lifeLikely to occuronceduring totaloperational lifeLikely to occurseveral timesduring totaloperational lifeTable 3ExtremeHarmModerateHarmSlightHarmRisk ClassificationVery Unlikely Unlikely Possible Likely Very LikelyVERYVERYMEDIUM RISK HIGH RISK HIGH RISK HIGH RISK HIGH RISKLOW RISK MEDIUM RISK MEDIUM RISK HIGH RISKVERYHIGH RISKLOW RISK LOW RISK LOW RISK MEDIUM RISK MEDIUM RISKNuisance LOW RISK LOW RISK LOW RISK LOW RISK MEDIUM RISKTo assess the level of risk:1. Select the expression for severity of harm that could result (in the worst case);2. Select the likelihood that this would happen;3. Cross-reference using the table to determine the degree of risk.If the risk is classified as MEDIUM or above (yellow, orange or red) additionalmitigation should be considered – and even then the risk may remain unacceptable.OTAC s/n 030 Issue 2 Page 13 of 13