When an aircraft is returned at the end of a lease period the aircraft’s maintenance plan will have evolved from that at the time when the aircraft lease began, which is normal, as for example the Maintenance Planning Data (MPD) changes and so the AMP (Aircraft Maintenance Programme) evolves in line.
It is also possible based on an operator’s requirements that task intervals will change (increase or decrease); typically, this might be based on reliability or the specific operating environment – additionally there might be local regulation requirements that apply.