A repair or modification of a method that is implemented before or after the publication of the public. The
will cause an aircraft to be put into operation after some beyond the approved or recognized by the continued airworthiness file repair or modification, and a variety of these repair and refit (especially for imported aviation products) for approval not only for air transport battalion, is complex and vague, for Civil Aviation Administration in different maintenance supervisor is also difficult to master unity of standard.
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