The objective of this study was to identify the most common criteria that airlines use to select, monitor, and assess the performance of third-party maintenance facilities. These criteria formed the basis to develop performance measures and risk indicators for the operation of aviation maintenance repair stations. In particular, this study focused on outsourcing of major maintenance to larger repair stations. A limited data collection effort was conducted by interviewing representatives from both airlines and repair stations, primarily in their respective quality assurance departments. The most important measures and risk indicators are grouped into three areas. The most important measures for repair station capabilities include training of employees, experience level of employees, and tools and test equipment of the repair station. The most important measures for repair station performance include audit procedures, ability to meet turn times, number of work discrepancies, suspected unapproved part(s) infractions, and certification infractions of the repair station. The most important measures for repair station administration include the financial status of the repair station and change management of the repair station.
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