(The following cp1.0 as field management) because of the maintenance process capability of thickness variation, was changed to once / half a year from once / year maintenance frequency.
You change low maintenance every six months / one time every year from thickness variation of process capability maintained for (Cp1.0 below as shop floor control).
The thickness variation capability, to maintain maintenance frequency to 1 times/year to 1 times/year change in the management of site Cp 1.0 or less).