While on the other hand, those with field experience will ensure that the technical guidelines can be interpreted into a language the service technicians understand. Another key area where a good link between the O&M activities and design is needed is in assessing the design for maintainability of major systems. In the case of a wind turbine gearbox the question RCM points out in the design phase is how easy it is to disassemble, gain access to major components and then assemble especially when repairs are to be done inside the turbine (up-tower). In current gearbox designs, the capability of up-tower repairs is limited not only due to the lack of competency or tools but due to the difficulty in accessing and disassembling major components