The Boeing MPD (Maintenance Planning Data) Document guides aircraft maintenance by outlining tasks, intervals, and important note, awareness of this document is of key importance.
This is an OEM (original Equipment Manufacturer) document for an aircraft manufactured by Boeing, and it is designed to cover the aircraft and aspects that Boeing are responsible for. There are multiple components on any aircraft that are either customised based on operator or complex and instructions for maintenance issued by their respective manufacture, so the OEM MPD is only one consideration for the maintenance.
Different aircraft manufacturers will have their own version of the document or a similar instruction for maintenance; the important aspect is to know that the tasks are required to maintain airworthiness, the aircraft is designed with the tasks defined as a critical part of maintaining the aircraft in a safe condition.
The tasks ensure that any issues from operation or over time are rectified and therefor maintain a managed and lower risk for operation.