Document ID: chunk:federal_register_of_legislation:F2010C00153:body:0:p8
Version: federal_register_of_legislation:F2010C00153
Segment Type: other
Provision Reference: 
Character Range: 23711–26861

'ATM' at which the 'Towbar' is rated; or
13.3.1.3.1.2.                 For a 'Towbar' marked for towing 'Dog Trailers', as per clause 13.5.1.4, (N) 0.5 x 9.81 x ['GGALR' (kg) for the front 'Axle Group' of the designated 'Dog Trailer'].
13.3.1.3.1.3.                 Notwithstanding the requirements at clauses 13.3.1.3.1.1 and 13.3.1.3.1.2, for vehicles towing trailers with hinged 'Drawbars' only, it need not be greater than +/- 10 kN.
13.3.2.                           'Towbars' – Over 3.5 tonnes 'ATM' – Dynamic Testing
13.3.2.1.                    Horizontal alternating force of minimum (kN) +/-  0.6 x 'Coupling' 'D-value' (kN), for the 'Coupling' 'D-value' at which the 'Towbar' is rated, acting in a line parallel to the ground and in the longitudinal median plane of the towing vehicle and a vertical alternating force of (kN) +/-  0.18 x 9.81 x 'ATM' (tonne), for the 'ATM' at which the 'Towbar' is rated, acting vertically for at least 2 million cycles.  The frequency is not to exceed 35 Hz and must be chosen so as not to coincide with any natural frequency of the system.
13.3.2.2.                    The horizontal and vertical alternating forces must be sinusoidal in shape and must be applied asynchronously so that the difference in their frequencies shall be between 1% and 3%.
13.3.3.                          'Towbars' – Over 3.5 tonnes 'ATM' – 'Approved' Calculations

         The strength of a 'Towbar' may be demonstrated for loads as per clauses 13.3.1 and 13.3.2 by 'Approved' calculation procedures where the calculations take into account both strength and fatigue resistance.

13.4.                                'Towbars' – Over 3.5 tonnes 'ATM' – Safety Chain Attachments
13.4.1.                          Except for vehicles designed for use in 'Road Trains', the 'Towbar' must be fitted with two safety chain attachments, mounted either side of and adjacent to, the tow 'Coupling'.
13.4.2.                          Each safety chain attachment provided on the 'Towbar' must withstand at least the following static forces, separately applied, without incurring any residual deformation that would interfere or degrade the function of the assembly or any breaks, cracks or separation of components. The static forces must be maintained for not less than 10 seconds:
13.4.2.1.                    Longitudinal tension (N) = 9.81 x 'ATM' (kg); and
13.4.2.2.                    vertical tension (N) = 0.5 x 9.81 x 'ATM' (kg).
13.4.3.                          'Towbar' safety chain attachments must be fixed to a part of the 'Towbar' which is permanently attached to the vehicle. Means of permanent attachment include at least either welding or bolting.
13.5.                                'Towbars' – Over 3.5 tonnes 'ATM' – Marking
13.5.1.                          Except where an integral part of the vehicle the 'Towbar' must be marked with the following information:
13.5.1.1.                    The 'Towbar' manufacturer's name or trade mark; and
13.5.1.2.                    the "make and model" shown on the 'Compliance Plate' or trailer plate fitted to the vehicle for which it is designed, or the manufacturer's