9 Maintenance

Preventive or corrective maintena nce can be necessa ry to maintain the specified performance of the safety-related parts. Deviations with time from the specified performance can lead to a deterioration in safety or even to a haza rdous situation . The information for u se of the SRP/CS shall include instructions
for the maintenance (including periodic inspection）of the SRP/CS.

The provisions for the maintainability of the safety-related part(s〕 of a control system shall follow
the  princi ples  given  in  ISO  12100:2010, 6.2.7. All  information  for  maintenance  shall  comply  with
TSO 12100:2010, 6.4.5.1e．