During production, the focus of the maintainability effort will be to ensure that the designed level of maintainability is not compromised by any proposed engineering changes. Additional operational testing
and demonstration will occur during production and deployment, and the maintainability engineer must be involved with these efforts to refine and update the assessment of the product's operational maintainability. The maintainability program plan may be updated to better define the activities to be conducted during production, deployment, and operational support. Supplier control will continue during production and may continue into the operational support phase. During the operational support portion of this phase, efforts must continue to track and evaluate proposed design changes (due to modifications and upgrades), track and evaluate the operational maintainability of the product, identify problems (ideally before they occur), and develop solutions for these problems. Maintainability design, analysis, and test will be required to support modifications, whether those modifications are made to address maintainability or for any other reason (e.g., safety, upgrade functional performance, extend life, etc.).