Mag checks
I noticed that in C172 (not sure about other types) POH normal checks there is no mention of "dead mag checks" in the after start and "live mag checks" in the before shutdown checks. The only mag check mentioned in the POH is during run up.
But club SOP does mention dead & live mag checks. Are these checks not mandatory, but up to operator / organization, that's why it's not in the POH?