Third, the use of step-by-step repair

       The repaired parts of the equipment are repaired several times in a planned manner, and only a part of the equipment can be repaired at a time.

       Fourth, the use of redundant technology, including the use of spare parts, spare parts replacement repair method

       This method, also known as reserve technology, is sometimes referred to as disaster recovery backup technology, which is a means of using the parallel model of the system to improve system reliability.

       Fifth, the use of no maintenance design or easy maintenance design

     A maintenance-free design is an ideal design that considers the possibility of “no downtime” and “no maintenance” for repairs to design equipment that does not require maintenance. It requires the elimination of equipment maintenance from the beginning of the design, especially for equipment with high maintenance costs.