Document ID: chunk:federal_register_of_legislation:F2010C00153:body:0:p11
Version: federal_register_of_legislation:F2010C00153
Segment Type: other
Provision Reference: 
Character Range: 32343–35345

longitudinal axis of the 'Coupling' and a vertical alternating force of (kN) static vertical 'Coupling' load +/-  (0.6 x 'Coupling' 'V-value' (kN)) in the vertical axis of the 'Coupling' asynchronously for at least 2 million cycles.

         The static vertical 'Coupling' load (kN) = 9.81 x S

         where: S = 'ATM' - 'GTM' (tonnes).

         The frequency of the longitudinal and vertical forces must differ by between 1% and 3% and are not to exceed 35 Hz, but must be chosen so as not to coincide with any natural frequency of the system.

14.2.3.                          'Drawbars' – 'Approved' Calculations

         The strength of a 'Drawbar' may be demonstrated for loads as per clauses 14.2.1 or 14.2.2 by 'Approved' calculation procedures where the calculations take in to account both strength and fatigue resistance.

14.3.                                'Drawbars'– Safety Chains
14.3.1.                          Safety chains must be affixed to a substantial structural member on every trailer that is not fitted with an 'Emergency Brake System' in accordance with ADR 38/… Trailer Brake Systems and on every 'Drawbar' of a rigid 'Drawbar' trailer except a 'Converter Dolly'.
14.3.1.1.                    For trailers over 2.5 tonnes 'ATM', there must be two safety chains fitted for connection to the towing vehicle.  Each safety chain must meet separately the strength requirements of clause 14.3.1.2 or 14.3.1.3.
14.3.1.2.                    For trailers up to 3.5 tonnes 'ATM', the safety chain must comply with AS 4177.4 - 2004 Safety chains up to 3500 kg capacity; or
14.3.1.2.1.              be a safety cable with a certified load capacity not less than that of a chain complying with AS 4177.4 - 2004.
14.3.1.3.                    For trailers over 3.5 tonnes 'ATM', the safety chain must be made from steel of a minimum 800 MPa breaking stress, conforming to the mechanical properties of Grade T chain as specified in AS 2321 - 2001 Short Link Chain for Lifting Purposes and must be of a size such that the minimum breaking load exceeds the 'ATM', or a size as shown in Table 1.

'Aggregate Trailer Mass'  Chain Size     Minimum Chain Breaking Load (tonnes)
(tonnes)                  (millimetres)
Over 3 .5 and up to 5.0   6              5.1
Over 5.0 and up to 8.0    8              8.2
Over 8.0 and up to 12.5   10             12.8
Over 12.5 and up to 21.5  13             21.7
Over 21.5 and up to 32.5  16             32.8
Over 32.5                 19             46.5

Table 1: Safety Chain Size Selection

14.4.                                 'Drawbars' – Safety Chain Attachment Points
14.4.1.                          Any safety chain attachment point affixing a safety chain to a 'Drawbar' must be located as near as practicable to the 'Coupling'. Where two points of attachment are required they must be mounted one on either side of the centreline of the 'Drawbar'.
14.4.2.                          Any safety chain attachment point affixing a safety chain