Document ID: chunk:federal_register_of_legislation:F2007C00494:body:0:p7
Version: federal_register_of_legislation:F2007C00494
Segment Type: other
Provision Reference: 
Character Range: 20050–23369

to the 'Towbar' showing the maximum rated capacity of the 'Towbar'.
13.3.                                'Towbars' Strength Requirements:
13.3.1.                          For vehicles other than those designed for use in 'Road Trains' and up to 23.5 tonnes 'ATM', the vehicle structure including the 'Towbar' must withstand loads as per Clause 13.3.1.1 or 13.3.1.2 without incurring either any residual deformation that would interfere or degrade the function of the assembly or any breaks, cracks and separation of components. Alternatively approval can be by calculation as per Clause 13.3.3.
13.3.1.1.                    the static forces separately applied at the intended 'Coupling' centreline:
13.3.1.1.1.              longitudinal tension and compression(N) = 1.5 x 9.81 x 'ATM' (for which towbar is designed)(Kg); and
13.3.1.1.2.              transverse thrust(N) = 0.5 x 9.81 x 'ATM' (for which towbar is designed)(Kg); and
13.3.1.1.3.              vertical tension and compression(N) = 0.5 x 9.81 x 'ATM' (for which towbar is designed)(Kg)
13.3.1.2.                    A horizontal oscillating force of + 0.6 x the maximum 'Coupling' 'D-value' marked on the 'Towbar' according to clause 13.2.1.3 and a vertical oscillating force of + 0.18 x 'ATM' (for which the towbar is designed) for 2 million cycles, applied asynchronously at the intended 'Coupling' centreline. The frequency not to exceed 35 Hz and must be chosen not to coincide with any natural frequency of the system.
13.3.2.                          For vehicles designed for use in 'Road Trains' or for vehicles over 23.5 tonnes 'ATM', the 'Towbar' must withstand loads as per Clause 13.3.2.1 or 13.3.1.2 without incurring either any residual deformation that would interfere or degrade the function of the assembly or any breaks, cracks and separation of components.  Alternatively approval can be by calculation as per Clause 13.3.3.
13.3.2.1.                    the static forces separately applied at the intended 'Coupling' centreline:
13.3.2.1.1.              the longitudinal tension and compression of 350kN; and
13.3.2.1.2.              the transverse thrust of 120kN.
13.3.2.1.3.              the vertical tension and compression of 120kN.
13.3.3.                          The strength of a 'Towbar' to withstand the forces of clauses 13.3.1 or 13.3.2 can be demonstrated by 'Approved' calculation procedures where the calculations take into account both the strength and fatigue resistance.
13.4.                                'Towbars' Safety Chain Attachment Requirements
13.4.1.                          For vehicles other than those designed for use in 'Road Trains' , the 'Towbar' must be fitted with two safety chain attachments, of strength meeting the requirements of clause 13.4.2, mounted one on either side of, and adjacent to, the tow 'Coupling'.
13.4.2.                          Each safety chain attachment provided on the 'Towbar' must withstand the following forces without either any residual deformation that may interfere with or degrade the function of the assembly or any breaks, cracks, or separation of components:
13.4.2.1.                    longitudinal tension(N) = 9.81 x 'Towbar's' rated capacity(Kg); and
13.4.2.2.                    vertical load (N) = 0.5 x 9.81 x 'Towbar's' rated capacity (Kg).
13.4.3.