Error Management

Failure to follow procedures is not uncommon in incidents and accidents related to both flight operations and maintenance procedures. However, the industry lacks insight into why such errors occur. To date, the industry has not had a systematic and consistent tool for investigating such incidents. To improve this situation, Boeing has developed human factors tools to help understand why the errors occur and develop suggestions for systematic improvements.

Two of the tools operate on the philosophy that when airline personnel (either flight crews or mechanics) make errors, contributing factors in the work environment are part of the causal chain. To prevent such errors in the future, those contributing factors must be identified and, where possible, eliminated or mitigated. The tools are procedural event analysis tool, maintenance error decision aid.

The procedural event analysis tool, for which training began in mid-1999, is an analytic tool created to help the airline industry effectively manage the risks associated with flight crew procedural deviations. It assumes that there are reasons why the flight crew member failed to follow a procedure or made an error and that the error was not intentional. Based on this assumption, a trained investigator interviews the flight crew to collect detailed information about the procedural deviation and the contributing factors associated with it. This detailed information is then entered into a database for further analysis. The procedural event analysis tool is the first industry tool to focus on procedurally related incident investigations in a consistent and structured manner so that effective remedies can be developed.

The maintenance error decision aid began as an effort to collect more information about maintenance errors. It developed into a project to provide maintenance organizations with a standardized process for analyzing contributing factors to errors and developing possible corrective actions. It is intended to help airlines shift from blaming maintenance personnel for making errors to systematically investigating and understanding contributing causes. As with the procedural event analysis tool, maintenance error decision aidis based on the philosophy that errors result from a series of related factors. In maintenance practices, those factors typically include misleading or incorrect information, design issues, inadequate communication, and time pressure. Boeing maintenance human factors experts worked with industry maintenance personnel to develop the process. Once developed, the process was tested with eight operators under a contract with the U.S. Federal Aviation Administration.

Since the inception of maintenance error decision aid in 1996, the Boeing maintenance human factors group has provided on-site implementation support to more than 100 organizations around the world. A variety of operators have witnessed substantial safety improvements, and some have also experienced significant economic benefits because of reduced maintenance errors. Three other tools that assist in managing error are crew information requirements analysis, training aids, improved use of automation.

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