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Each Engineering Director (or equivalent) must define the person or people within each Group Company
who have the necessary competence to draft the policies identified in this Global Standard.

Wherever possible it is recommended that a peer review of draft standards is carried out across the
Group to capitalise on existing expertise and best practice.

Risks

The purpose of this standard is to minimise the risk of component wear or failure of safety critical items
affecting customers, people or assets. This must start with a defined process for vehicle safety
inspections, found in Global Maintenance Standard (GMS) 3, and ongoing repair and maintenance
throughout the vehicle life cycle. It will also, where appropriate, cover the requirements for defect
management and deferral of defects.
Management of safety critical defects, when implemented effectively, will reduce the risk to passengers
and increase the effective use of assets and therefore management of safety critical defects must be
deemed as a ‘safety critical’ activity.
All policies and procedures implemented in line with this standard must be effectively managed and
enforced at all levels.

1.0 Identification of Safety Critical Defects

Group Companies must define a comprehensive list of safety critical defects, these can be identified, in
part, through the Global Maintenance Standards, as detailed below:

Routine vehicle inspection – GMS 3
Vehicle fire risk assessment – GMS 2
Vehicle pre use checks and defect reporting – GMS 6
Vehicle Servicing – GMS 7
Wheel fitment – GMS 1

Each of these standards are designed to identify and manage potential defects and local policies should
be in place in order to discharge these standards effectively. Part of the effective implementation of
these standards will be identification of related, potential defects.

2.0 Defining Safety Critical Defects

Group Companies must establish an appropriate method of defining and clearly documenting defects
that are deemed to be safety critical. This may take the form of a paper or electronic ‘Standards Manual’
that defines safety critical defects, including wear limits/tolerances and reasons for failure, and is readily
available to those making decisions on roadworthiness.
A process to ensure updates and changes to these manuals are communicated effectively and in a
timely manner, must be put in place.

Group Companies must take into account minimum legislative requirements and previous experience
from incidents or events as well as manufacturer requirements when defining the safety critical defects

Global Maintenance Standard: Safety Critical Defects 5