Abstract: Based on the requirement of civil aviation AD in China, the logic vector way is used for studying on the decision-method of scheduled preventive maintenance tasks by virtue of the last MSG-3REV2003.1 concept. By far, the similar model database is developed to satisfy the requirement of decision-supporting, and may be referenced. This not only enables the analyzing procedure convenient and simple, but also ensures the preventive task effectiveness and applicability. Therefore there are both vital realistic and of guidance senses for developing preventive maintenance tasks of new model civil aviation developed by China.

Key words: aircraft maintenance engineering, maintenance task, MSG concept, decision-supported, maintenance