May 19, 2017, ©. Leeham Co: Last week we described the different working groups and review committees and boards involved in defining a new airliner’s maintenance requirements.
We now continue with describing a practical maintenance task from the maintenance plan for a common aircraft, the Airbus A320.
The ultimate responsibility for keeping an airliner fit for purpose lies with the operator. And the operator is responsible to his local airworthiness authority (the FAA in the US, the authority in the operator’s Air Operators Certificate (AOC) country for non-US airlines).
These authorities have additional requirements on top of what the Maintenance Review Board Report (MRBR) prescribes. The requirements are described in Certification Maintenance Requirements (CMR, contains maintenance task that must be done to keep the Type Certificate) and different Airworthiness Limitations documents (AL, e.g. tasks to inspect fuel tanks to prevent arcing or fatigue hard limits for structural parts).
To this shall be added Airworthiness Directives (ADs) such as Service Bulletins (SB, modifications that shall be made to the aircraft).
All these inputs are gathered in the Maintenance Planning Document (MPD) issued by the aircraft manufacturer.
We will now look at an entry in a Maintenance Planning Document for the Airbus A320 series. Figure 1 shows the maintenance instructions for an inspection of the passenger doors surrounds.
The task description contains several items:
The task is followed by a deleted task for this revision of the MPD and a fuselage inspection task.
A Maintenance Planning Document (MPD) contains thousands of such tasks. We will give more examples and go through how the tasks are grouped into different types of maintenance checks next week.