The implantation of production processes by using network planning for mass production is considered essential in machine production and maintenance . This is more important when producing items as an integrated project that has to be finished in specific time and with last cost. The network planning is seen from a new perspective because it studies reaction method and response method to incidental (emergency) events in industrial production such as ( machine malfunction, shortage in raw materials…) This study uses probability methods which considers all previous factors when calculating the critical path in Network plans. The new approach of this research is using Network planning for programming production processes in mass production especially in maintenance processes.