Maintenance Error Decision Aid (MEDA)


- Initial program development by Boeing in early 1990’s

- Aims to increase utilization value of investigation outcomes of erroneous maintenance procedures

- A formally structured effort to place a particular human error in its complete procedural situation.

- Early retrieval and security of essential information towards analysing the main causal factors of the error, in order to prevent loss of these important data.

5 Main MEDA Processes:

1) Selecting a particular technical incident that the maintenance organisation has expressed interest to execute investigation on. Competent
maintenance staff can assist investigators in acknowledging the potential areas that could lead to a serious error.

2) Deciding if the error acknowledged is relevant to the maintenance field.

3) Utilise the MEDA results form to note a formal account of the related data about the incident that revealed the error, the causal error, the contributory areas (documentation misinterpretation, miscommunications, inadequate facility support, design loopholes etc) and subsequently suggest feasible prevention methods.

4) Assure that prevention methods highlight prioritisation, execution and follow up of procedural enhancements.

5) Provide constructive comments by highlighting the improvements made, importance of active staff involvement as well as the investigation outcomes.

Human Factors Benefits

- Analyzing, highlighting and avoiding erroneous areas instead of only retraining the employees who commit the maintenance errors.

- The probability of an error occurrence can be minimised by identifying and improving contributing factors.

Case Studies from UK CHIRP-MEMS Maintenance Error Management System:




Boeing. (2010). Human factors process for reducing maintenance errors. Retrieved 7 September 2010, from

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