Speaking as an engineer and a cpl licence holder ,our aircraft are maintained too class A standards and we have our own maintanance system,For our c210s we dont have any provisions for +- hours on due items.M/R is valid for 12 months and 100 hours from date of issue,In addition any A/Ds due within that period either calander date or a/c ttis.Our twin fleet we have a +-5 hours on due inspections(not A/Ds)50hrly/100hrly/150hrly and 200hrly.As you can see we have a 12 month M/R and 200 hours life.Our maintance system is made from manafactures time life limit checks and then the whole package is approved by CASA
On the other hand we maintain a number of private aircraft to schd 5,which is the casa system,In addition too this you also have too incorperate the manafactures time/limit checks.The M/Rs we issue with theses aircraft are valid for 12 months and unlimited hours,aslong as you adhere to all A/Ds and manafactures time/life limit intervals. On a few occastion owners have run out of calander time and we have had to get special flight permits too get the aircraft back too there maintance base.
Soo if it isnt on the M/R dont do it no matter what anyone tells you.Its the resposibility of the PIC too check the M/R prior too each flight too make sure nothing is due or going too fall due during next flight.The LAME and Maintanace controller are responsible that all info on the M/R is correct and acurate.Soo if something is overflown due too the wrong hours written on M/R the lame cops it then the maintanance cotroller.Not the pilot because he/she opperrated the aircraft within the limits of the M/R