scope:

This standard is split into 4 defined sections:

a) Parts 01, and Part 02

b) Part 03.

c) Part 04, Part 05, and Part 06.

d) Part 07.

Parts 01 to 02 detail the references and processes applicable to all Maintenance Testing

Part 03 is applicable to all aspects of Maintenance Testing.

Parts 04 to 06 are applicable to reactive corrective maintenance items only.

Part 07 is applicable to pre-planned minor renewal items that are on a like for like basis only.

Generic outlines of the contents of Parts 03 to 07 are as follows:

NR/SMTH/Part 03

Covers defined checks and tests that are undertaken as part of Maintenance Testing.

NR/SMTH/Part 04

Deals with the like for like replacement of signalling assets or missing assets that arise through corrective maintenance activities usually as a result of a failure.

NR/SMTH/Part M04

Deals with the like for like replacement of missing signalling assets that arise through corrective maintenance activities.

NR/SMTH/Part 05

Deals with failure investigation of signalling assets.

NR/SMTH/Part 06

Deals with like for like replacement of telecom assets or missing assets that arise through corrective maintenance activities usually as a result of a failure.

NR/SMTH/Part 07

Deals with Maintenance Testing of signalling assets that are like for like but are part of preplanned activities

PURPOSE

The purpose of this standard is to define the mandatory procedures and tests for Maintenance Testing of signalling equipment to make sure it is tested with sufficient depth and independence to assure safe working when returned to service.

Maintenance Testing covers both reactive corrective work (e.g. the rectifying of faults and the replacement of faulty items on a like for like basis) and minor renewals (e.g. pre-planned work to renewal existing signalling equipment that are like for like) that are not Extensive and Simultaneous.