scope:

This Guidance applies to fleet train maintenance and equipmemt overhaul carried out by London Underground Limited.

Purpose 

To provide a good practice torque tightening guide for London Underground fleet maintainers and overhaulers. It covers proof strength, various fixing methods, torque settings, torque wrench setting procedures, how torque fixings are detailed on drawings and the importance of complying with assembaly work instructions to prevent dangerous and expensive failures due to incorrectly tightened assemblies.