AMC M.A.402(c) Performance of maintenance    

CAA ORS9 Decision No. 1

The general maintenance and inspection standards applied to individual maintenance tasks should meet the recommended standards and practices of the organisation responsible for the type design, which are normally published in maintenance manuals. In the absence of maintenance and inspection standards published by the organisation responsible for the type design, maintenance personnel should refer to the relevant aircraft airworthiness standards and procedures published or used as guidance by the CAA. The maintenance standards used should contain methods, techniques and practices acceptable to the CAA for the maintenance of aircraft and its components.