A maintenance method (20) (and apparatus) based on reliability centred maintenance (RCM), applied for example to a military aircraft, comprising the following steps performed in a feedback manner: i) performing RCM (1); ii) feeding outcomes derived from performing the RCM (1) to an update process (3, 4, 5, 6); iii) performing the update process (3, 4, 5, 6) to provide update data for performing the RCM; and iv) inputting the update data into the performing of the RCM. Further comprising carrying out a maintenance action (86) selected by and/or or at a time and/or extent specified by the performing of the RCM (1); the outcomes that are fed to the update process (3, 4, 5, 6) comprising outcomes from the maintenance action (86) that is carried out. The maintenance method (20) thereby provides a continuously updating RCM process.
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