Aircraft Maintenance Technology

APR-MAY 2018

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AIRLINE Maintenance event database is helpful for identifying and tracking patterns. Sometimes MEDA investigations reveal problems that need to be fixed right away. Sometimes it is reasonable to wait and see if a common theme will emerge out of multiple MEDA investigations, especially if the corrective action is a costly investment. It is also important to let the employees know what the company is doing with MEDA investigation findings. System improvements through MEDA will be the best promotion to foster trust and willingness to participate in any future MEDA investigations. KEY MEDA REFERENCES There are two main MEDA references: (1) MEDA Results Form — used during the investigation, and also a template for writing an investigation report (2) 70-page-long MEDA User's Guide — a "how-to" manual on carrying out a MEDA investigation. The main references, complemented by practice scenarios and training, are updated on a regular basis. The most important section in the MEDA Results Form is a checklist of 10 categories of contribution factors, which explain why errors and violations occur and result in system failures, which eventually resulted in an event. Most of the causal relationships discovered in event investigations are probabilistic in nature (e.g., existence of contributing factors increases the likelihood of an error). Six rules of causation help to guide MEDA investigators to collect more, better data and be more effective in authoring investigator reports: 1. Each human error must have a preceding cause. 2. Each procedural deviation (violation) must have a preceding cause. 3. Causal statements must clearly show the "cause and effect" relationship. 4. Negative descriptors (such as poorly or inadequate) may not be used in causal statements. 5. Failure to act is only causal when there is a pre-existing duty to act. 6. Causal searches must look beyond that which is within the control of the investigator. MEDA INVESTIGATORS APPLY COGNITIVE INTERVIEWING TECHNIQUES The primary method to gather data in MEDA investigation is through conducting interviews with technicians or inspectors who were involved in the event. FIGURE 1. Process flow of MEDA investigations. 8 APRIL/MAY 2018 AIRCRAFT MAINTENANCE TECHNOLOGY

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