Page 63 - Global Maint Stnd_v2.2

3.0 Prevention of Safety Critical Defects

Group Companies must implement an engineering process to prevent, as far as possible, safety critical
defects from occurring, see GMS 1 – Routine Vehicle Inspection. This could be in the form of a
‘preventative maintenance’ system whereby parts are replaced at a defined interval based on
mileage/Kilometres run or hours operated; this could form part of vehicles servicing.

All vehicles and components must be subject to ongoing maintenance and servicing to ensure that
components and units are maintained to the highest required standard. This will include, ensuring the
required maintenance intervals are planned and discharged in a timely manner, based on manufacturer’s
requirements and local experience/intelligence. This will include, but is not limited to greasing and
lubricating required parts and components.

Alternatively parts can be replaced on a ‘condition monitoring’ programme based on safety inspection, as
defined in GMS 3, this must include appropriate inspection and monitoring frequencies for defects
identified.

Any method of prevention must encompass all defects identified as safety critical with defined triggers for
repair or replacement. This will be based on legislative and manufacturer requirements, as well as any
local experience or knowledge from previous incidents, near misses or intelligence.

Where preventative maintenance programmes are in place, Group Companies must define the specific
components, the change interval frequency and units of measure, and the justification for change. It is
accepted that Group Companies may adopt a mix of both preventive and condition monitoring
maintenance to reduce the risk of defects occurring.

Prevention of safety critical defects must be considered as part of all maintenance programmes

3.1 Vehicle Safety Inspection

All defects defined as safety critical must be included in the list of criteria that make up any vehicle
safety checks. All of the requirements of GMS 3 ‘Routine Safety Inspections’ must be adhered to, this
will encompass all defects including those that are defined as safety critical.

Group companies may wish to identify safety critical defects within this list of defects, however this is not
compulsory as long as any defects defined as safety critical are included.

Global Maintenance Standard: Safety Critical Defects 7