RISK MATRIX WITH ANSWERS

Aviation safety management requires more than assigning a colour or numerical score to a reported hazard. A comprehensive Safety Management System (SMS) must provide a consistent process that begins when a report is received, protects the operation through immediate securing actions, evaluates the hazard using defined criteria, determines the required organizational response, and follows the issue through investigation, corrective action, monitoring, and follow-up. The attached 10×10 risk matrix and supporting definitions provide this broader capability and therefore offer significant advantages over a conventional 5×5 matrix.

The principal advantage of the 10×10 matrix is analytical resolution. A 5×5 matrix provides twenty-five likelihood-and-severity combinations, while a 10×10 matrix provides one hundred combinations. Aviation hazards frequently differ only incrementally in frequency, consequence, or operational exposure. When only five categories are available, materially different hazards can be forced into the same classification. Ten likelihood and ten severity levels allow the assessor to identify smaller but operationally important differences, improving prioritization and reducing the possibility that developing risk remains hidden within a broad category.

The definitions are essential because they establish a common language for risk assessment. Likelihood is divided into ten levels: Inconceivable, Rarely, Remotely, Randomly, Variable, Occasionally, Often, Frequently, Regularly, and Systematically. These definitions describe progressively increasing recurrence characteristics rather than leaving personnel to interpret vague terms such as “unlikely” or “likely.” For example, Rarely represents circumstances beyond factors applied in operational problem-solving, while Frequently describes a reliable and dependable occurrence. Regularly identifies short, constant, dependable intervals, and Systematically identifies methodical, planned, dependable occurrence. This structure allows reports, operational experience, records, and observed trends to be translated into a repeatable likelihood determination.

Severity is also divided into ten levels, ranging from Informational through Negligible, Minor, Low, Considerable, Major, Significant, Hazardous, Critical, and Catastrophic. The progression provides greater discrimination between an observation having no compatible consequence and a condition capable of producing irreversible harm, damage, loss, crisis, accident, or disaster. This is especially valuable in aviation because hazards can share similar likelihood but have substantially different potential outcomes. Defined severity terminology helps ensure that assessments are based on the credible consequence of the hazard rather than the assessor’s personal perception of importance.

A further strength is the separate Exposure scale. Exposure ranges from Level I, Annually, through biannual, quarterly, monthly, weekly, seven-day, daily, 12-hour, hourly, and Level X, 15-minute intervals. Exposure asks how often the operation is actually subjected to the identified hazard. This distinction is important because likelihood and exposure are related but are not identical. A hazard with a relatively low probability of producing an occurrence can become operationally significant when aircraft, crews, maintenance personnel, or ground personnel are repeatedly exposed to it.

The matrix therefore establishes risk from likelihood and severity and then requires exposure to be considered before the final Safety Risk Level (SRL) is assigned. This creates a more dynamic assessment than a basic 5×5 calculation. Increased operational exposure can elevate the risk level even when the inherent severity remains unchanged. Conversely, effective controls that reduce exposure can be recognized during subsequent assessment. The matrix becomes a management instrument for changing operational conditions rather than merely a static scoring table.

Importantly, the definitions establish what must happen after a hazard report is received. Immediate securing actions come first. These are the actions necessary to protect people, aircraft, equipment, property, and the operation from immediate harm. Securing the situation is not the corrective action and does not close the report. Once immediate safety has been established, the defined assessment process begins. Personnel identify the hazard, determine its exposure level, determine the likelihood of the time between hazard intervals, and determine the credible severity.

The resulting SRL then provides the first structured organizational action after securing actions are complete. SRL 1 requires Communicate; SRL 2 adds Monitor; SRL 3 adds Pause; SRL 4 adds Suspend; and SRL 5 adds Cease. This progressive structure is particularly valuable because the risk assessment produces an operational decision rather than simply generating documentation. Communication remains necessary throughout escalating levels, while progressively stronger controls are introduced as risk increases. A high-risk report therefore cannot disappear into an administrative queue while unsafe exposure continues.

The associated priority levels further define when the first action must occur. Level 1 requires action upon notification, Level 2 within 24 hours, Level 3 within seven days, Level 4 within one month, Level 5 within three months, Level 6 within 12 months, and Level 7 may be up to 36 months. This provides management with a practical method for allocating resources according to urgency while maintaining visibility of lower-priority issues. It also gives hazard owners a documented basis for explaining decisions to employees and management, supporting transparency, accountability, consistent escalation, and organizational learning across all future operations.

The definitions also connect risk assessment with Quality Assurance. Following initial assessment and required operational action, the process identifies investigation, trend investigation, determination of Special Cause Variation, root cause analysis, Special Cause Variation root cause, Corrective Action Plan (CAP), assignment of the CAP, monitoring, and follow-up. This sequence is important because a report should not be considered resolved simply because the immediate unsafe condition was secured. Securing controls the immediate situation; investigation determines what happened; root cause analysis determines why it happened when special cause variation exists; corrective action addresses the organizational causes; and monitoring and follow-up verify that the corrective action is effective.

Compared with a 5×5 matrix, this framework therefore provides a more complete bridge between Safety Risk Management and Safety Assurance. It supports initial classification, exposure adjustment, operational response, investigation, corrective action, and verification. The additional categories also improve trend analysis because smaller changes in occurrence frequency or consequence can become visible before they develop into unacceptable risk.

The 10×10 model must nevertheless be applied with disciplined human judgment. Additional categories should not be mistaken for mathematical certainty. Definitions must be incorporated into SMS procedures, personnel must be trained to apply them consistently, and assessments should use reports, operational records, maintenance information, investigations, and other available evidence. Management should periodically calibrate assessments to ensure different hazard owners interpret the definitions consistently.

Overall, the 10×10 matrix is preferred for comprehensive aviation SMS analysis because it does more than rank hazards. Its defined likelihood, severity, and exposure scales create consistency; its five SRLs translate assessment into operational action; its priority levels establish response timing; and its Quality Assurance steps carry the report forward after immediate securing actions. The process establishes an important distinction: making the operation safe immediately is only the beginning. After securing actions are completed, the organization must assess, communicate, monitor, pause, suspend, or cease as required, investigate the underlying condition, implement appropriate corrective action, and verify effectiveness through monitoring and follow-up. That continuous path from report to verified action makes the 10×10 framework a stronger tool for proactive, evidence-informed, and accountable aviation safety management.

 

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