Document ID: chunk:federal_register_of_legislation:F2010C00153:body:0:p7
Version: federal_register_of_legislation:F2010C00153
Segment Type: other
Provision Reference: 
Character Range: 20781–23992

tonnes 'ATM', the 'Towbar' towing bracket, towbar attachment and vehicle structure must comply with the requirements of AS 4177.1 - 2004 Towbars and towing brackets.

13.2.                                Over 3.5 tonnes 'ATM'

         For vehicles with a maximum rated towing capacity of over 3.5 tonnes 'ATM', the 'Towbar' towing bracket, towbar attachment and vehicle structure must comply with clauses 13.3 – 13.5.

13.3.                                'Towbars' – Over 3.5 tonnes 'ATM' – Strength

         For vehicles with a maximum rated towing capacity of over 3.5 tonnes 'ATM', the 'Towbar' towing bracket, towbar attachment and vehicle structure must withstand the relevant static or dynamic forces nominated in clauses 13.3.1 or 13.3.2, according to their maximum rated capacity, when these forces are applied separately at the intended 'Coupling' centreline without incurring any residual deformation that would interfere or degrade the function of the assembly or any breaks, cracks and separation of components. The static forces must be maintained for not less than 10 seconds. Alternatively approval may be by 'Approved' calculations as per clause 13.3.3.

13.3.1.                          'Towbars' – Over 3.5 tonnes 'ATM' - Static Testing
13.3.1.1.                    Longitudinal Tension and Compression
13.3.1.1.1.              For vehicles towing trailers up to 23.5 tonnes 'ATM', other than 'Converter Dollies' a (N) 1.5 x 9.81 x 'ATM' (kg) for the 'ATM' at which the 'Towbar' is rated.
13.3.1.1.2.              For vehicles towing trailers over 23.5 tonnes 'ATM', and 'Converter Dollies' the lesser of 350 kN; or
13.3.1.1.3.               2.25 x 'Coupling' 'D-value' (kN) for the 'Coupling' 'D-Value' at which the 'Towbar' is rated.
13.3.1.2.                    Transverse Thrust
13.3.1.2.1.              For all vehicles towing trailers, 120kN. Alternatively, the following may be used:
13.3.1.2.1.1.                 (N) 0.5 x 9.81 x 'ATM' (kg) for the 'ATM' at which the 'Towbar' is rated; or
13.3.1.2.1.2.                 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'].
13.3.1.2.1.3.                 Notwithstanding the requirements at clauses 13.3.1.2.1.1 and 13.3.1.2.1.2, it need not be greater than (N) {['Wheelbase' (m) + 'Coupling' Offset (m)] /'Wheelbase' (m)]} x [sum of the 'Axle Loads' (kg) for the rear 'Axle Group' of the towing vehicle when at 'GVM'].

           where: 'Coupling' Offset is the dimension from the rear wheel centrelines of the towing vehicle (as used to determine the 'Wheelbase') to the centre of the 'Coupling' (m).

13.3.1.3.                    Vertical Tension and Compression
13.3.1.3.1.              For all vehicles towing trailers, 120kN. Alternatively, the following may be used:
13.3.1.3.1.1.                 (N) 0.5 x 9.81 x 'ATM' (kg) for the '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