Page 45 - National Express_ GMStands

Group Companies must therefore, have a controlled process for the authorisation of modifications,
particularly if the system affected is deemed to be safety critical. This process must include Safety
Validation of Change, as well as Risk Assessment and Parts Evaluation Procedures.

Wherever possible, Group Companies must make every effort to gain manufacturer approval for such
modifications in order for the OEM to maintain any liability.

5.0 Parts Supersession

It is recognised that Group Companies, from time to time, will experience parts supersessions that are
driven by OEM suppliers.

This may be as a result of a new supplier to the OEM, the part being deleted and replaced with multiple
parts (i.e. a valve and extra fittings) or a new part being supplied under the old part number. In each of
these cases, as the part is supplied by the OEM, Group Companies are not required to undertake any parts
approval or assessments.

It is incumbent on qualified and experienced engineers and, where in position, stores staff, to ensure that
parts that are issued for fitment are of a like for like specification. Where obvious differences are apparent,
Group Companies must have a process for identification and feedback of any changes to parts that may
not have been communicated by the supplier to, where relevant, the Group Company’s Procurement
Department (or those charged with sourcing parts).

6.0 Storage, Handling, Shelf Life & Stock Rotation

Group Companies must ensure that parts are stored in suitable conditions to prevent degradation or
damage whilst in storage. For some sealants, thread locker, adhesives and other perishable products, shelf
life and the rotation of stock must be considered. This is to ensure the risk of using products that are out
date, and potentially ineffective, is reduced.

7.0 Overhaul of Safety Critical Parts Internally

Group Companies must ensure that where they overhaul parts, which are deemed to be safety critical, they
have suitable and sufficient processes in place to assure the final product. This may include, but is not
limited to:

An assessment and decision on the cost effectiveness of overhaul against purchasing the part
elsewhere.
A specification that covers, strip, rebuild and test processes including any critical dimensions or test
performances.
A suitable cleaning process
A list of 100% changed parts
A list of required calibrated tools and any test rigging required
A suitable packaging and transport process
A suitable assessment of parts produced against original specification or pattern (sample checks)

Global Maintenance Standard: Parts Management (Including Safety Critical Parts) 8