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6.0 Safety Critical Defect Management

Group Companies must establish a defect management system that prioritises any safety critical defects
and establishes clear and robust guidance for dealing with safety critical defects that carry risk once they
have been identified.

As a minimum, this is to include policies that prevent the allocation of vehicles for service which have
safety critical defects identified that have not been repaired, reviewed and signed off by an authorised
person.

7.0 Investigation of Safety Critical Defects

Safety critical defects should be investigated, where required/warranted if a situation deems it
necessary, such examples would be:

Fatalities
Catastrophic failure of a component
Injury to a passenger resulting in hospitalisation over night
Damage to third party property (building, road furniture or vehicles)
Fires

This list is not exhaustive and where there is a valid reason to investigate any failure of components this
must be carried out in accordance with local policies. This will include notification of any incidents to the
local regulatory office, if required.

7.1 Sharing Experience and Best Practice

Group Companies must endeavour to share best practice and any results of investigations should be
shared with other Group Companies to allow them to review or update maintenance systems and
processes accordingly to reduce the risk of potential incidents or component failure occurring.

8.0 Monitoring and Trend Analysis

Group Companies must endeavour to establish either digitised or paper systems to analyse trends in
safety critical defects and management of the process. Any trends identified must be acted upon to
prevent potential future failures.

Global Maintenance Standard: Safety Critical Defects 9