4. Analysis procedure for propulsion systems/means

The method for determining scheduled maintenance tasks and their intervals uses a multi-level decision logic diagram.

The proposed logic is based on a technical assessment of each Maintenance Significant Item (MSI). An MSI item is an entity that has been identified by the manufacturer and whose failure may :

• affect aircraft safety on the ground or in flight;

• be undetectable during aircraft operation;

• have a significant operational impact;

• have significant economic repercussions.

Remember that the SAI's role in the MRB procedure is to validate the selection of MSIs proposed by the manufacturer, as described in section