Aircraft in use is inevitable after some repairs and refitting work, aviationAnd parts manufacturers are generally published manuals, circulars, letters, in the form of aircraft repair and refitting work provide guidance or instructions (included in the approval or recognition of airworthiness documents), but given the diversity of the repair and refitting work, with a certain amount of unpredictability, guidance or instructions provided by the manufacturer is often not exhausted in every situation. In addition, as an aircraft owners or users may also be based on its independent development of repair and refitting work; manufacturers for a variety of reasons (such as technology, economic factors, increased efficiency, individual support) developed some
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