前言随着中国民航业的快速发展,民航机队规模也在不断扩大。由于中国民航机队的航材大部分需要进口,主要零部件,尤其是发动机的国外送修仍然占航空公司航材送修的主要部分,因此维修成本相对较高。航空公司迫切希望通过使用PMA产品来降低维修成本,提高其市场竞争力。一、PMA定义PMA件是指安装在已获得型号合格证的民用航空产品上作为加改装或更换用 Foreword With the rapid development of China’s civil aviation industry, the size of civil aviation fleet is also constantly expanding. As most of the civil aviation fleet of China’s civil aviation aircraft needs to be imported, the main parts and components, especially the overseas repairs of the engines, still account for the major part of the aircrew repair and maintenance services, so the maintenance costs are relatively high. Airlines are eager to reduce maintenance costs and increase their market competitiveness through the use of PMA products. First, the definition of PMA PMA refers to the installation of the model has been obtained certification of civil aviation products as a plus or replacement