The objective of the CAA U.K. study was to analyse a selection of maintenance related events on jet aircraft above 5,700kg MTOW, captured and stored under the requirements of the CAA’s Mandatory Occurrence Reporting (MOR) scheme to identify trends, themes and common causes or factors.
A total of 3,982 maintenance related MORs for the period January 1996 to December 2006 was studied. In the results, just over half of the occurrences analysed were attributed to incorrect maintenance actions, a quarter to ineffective maintenance control and a fifth to incomplete maintenance.
The data showed that the vast majority of MORs were related to ATA Chapter 25 (Equipment and Furnishings), escape slides in particular. (CAA)