发动机的研制周期一般比飞机长１２～１８个月，因此发动机的研制必须在飞机的技术要求完全确定以前就得开始。这往往造成发动机不能适应飞机的最终设计，必须进行耗资巨大的修改。为了缩短发动机的研制周期，即从发动机项目上马到取得合格证的时间，罗·罗公司采取了一系列有效的精益生产措施。他们的目标是到１９９５年后期将发动机的研制周期由目前的４年缩短到３年，同时使研究和研制费用降低３０％。 The development period of the engine is generally 12 to 18 months longer than that of the aircraft. Therefore, the development of the engine must begin before the technical requirements of the aircraft are completely determined. This often results in the engine not being able to adapt to the final design of the aircraft and must be costly to modify. In order to shorten the development cycle of the engine, that is, from the engine project to the time of obtaining the certificate, Luo Luo Company has adopted a series of effective lean production measures. Their goal is to reduce the engine’s development cycle from the current 4 years to 3 years by the end of 1995, while reducing research and development costs by 30%.