Hi
It’s not that easy to answer!
1st you go with the MPD (must)
2nd usually the manufacturer has two or three different maint schedules drawn up
3rd it’s up to the operator to accept/select one or come up with a self made program (approved and accepted by the manufacturer and local authority).
Time has changed and the majority is doing as little as possible to reduce the ground time and maintenance costs !
……..
you really have to come up with more details
mjv