| Summary: | 碩士 === 國立中央大學 === 工業管理研究所在職專班 === 102 === American Wright brothers drove self-developed fixed wing plane in 1903, that realizing the motive force fly for the first time in the human history, over 100 years past, the airborne vehicle even aviation industry have grown vigorously, have expanded human scope of activities and pace substantially, rewrite the history of human transportation completely. Though once there was a period of prosperity in the aviation industry, as the international crude oil price was going up constantly, purchase the oil expenditure and account for the proportion of the operating cost of the airline have soared year by year, in addition, terror has been threatened constantly since September 11 attacks of U.S.A. and violent competition among the same trade, the depression causes the market of aviation to shrink gradually, it will be difficult to make a profit. How to reduce operating cost, create niche and increase revenue, already become an airline's important existence subject.
The civil aero-engine has being offered the power of civil airplane, meet the demand that transport service of civil aviation carries passenger and freights, however, the engine is used for operations, needs to be changed regularly, and enter the shop for maintenance or overhaul in order to guarantee engine on wing operation and reliability. The maintenance cost of engine nearly occupies 40% of the maintenance cost of whole plane, to maintain the engine reliability and reduce the maintenance cost at the same time, it has been airline's diligent direction all the time. It is the most important task to maintain the engine Turn Around Time(TAT) for an Engine Shop, the time between engine enters the shop for maintenance and dispatched from the factory, If TAT can be maintained accurate and on time, the engine shop in for maintenance schedule will be stable, implement the maintenance program and arrange planning effectively, and then ensure the flight security, reduce the operating cost of the airline; If engine shop can further reduce TAT, spare engine quantity for fleet supporting will be able to reduce, to sell or loan out the extra spare engine can increase airline’s revenue; In addition, a short and punctual TAT will increase shop own competitiveness and contract the engine to maintain ability, raise the company’s profit and create the business opportunity.
In order to achieve the important goal of engine TAT reduction, this study is making use of the improvement or rebuilding the key procedure to reduce TAT in the optimization, then reach whole TAT reduction in the maximization, with the practice experience of the work in the shop, constructs and sums up the rebuilding of the main key overhaul procedure, propose and tabulate the possible practice sufficient to improve and reduce procedure TAT, sift and examine the limiting conditions out first, and then set objectives formula, but a lot of feasible solutions exist in each procedure for the function, because resources are limited and goal conflict between each other, unable all choose to implement, this study uses Multiple Objective Programming method to find out all solutions while being feasible. Once feasible solutions of every procedure have been obtained, use Analytic Hierarchy Process method at the same time, the complicated decision question that will involve numerous considerations builds the level of constructing, the policymaker chases one layer of relative importance which judges every factor of evaluation, judge the priority of every decision scheme, make the best decision of the TAT reduction, expect it is the engine maintenance shop that affiliating to the airline to propose improving direction and suggestion of the case airline.
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