Check your lbs. also what type of aircraft do you have.
Another case of trying to shot the messenger.
Depending on your aircraft you will find it I chapter 5 of your aircraft m/m
Just because your are using shedule 5 it dose not discule you from complying with manufacturers sb tbo msb etc. the only disculsion you have from them is if an AD gives you that right or you have it on your LBS.