Text in force at CS25-28: from CS25-5, effective 5 Sep 2008.
(a) Means must be provided to allow inspection (including inspection of principal structural elements and control systems), replacement of parts normally requiring replacement, adjustment, and lubrication as necessary for continued airworthiness. The inspection means for each item must be practicable for the inspection interval for the item. Non-destructive inspection aids may be used to inspect structural elements where it is impracticable to provide means for direct visual inspection if it is shown that the inspection is effective and the inspection procedures are specified in the maintenance manual required by CS 25.1529.
(b) Electrical wiring interconnection systems must meet the accessibility requirements of CS 25.1719.
ED Decision 2008/006/R · Source